Free Online Tools for Everyone

Image Tools Passport Photo Maker Crop a local portrait to a common 35×45 mm aspect ratio and export; verify official country requirements separately.

Image Tools Favicon Generator Create common favicon PNG sizes from a local image and package them with an HTML snippet.

Image Tools Image to SVG Converter Convert a local raster image into a grid-based SVG illustration; fine detail is simplified.

Image Tools Image Pixel Art Converter Create a pixelated local image with adjustable grid resolution and nearest-neighbor scaling.

Image Tools Image Perspective Editor Apply a local trapezoid perspective warp with adjustable top and bottom insets.

Image Tools Image Splitter Split a local image into a configurable grid and download all tiles in a ZIP.

Image Tools Image Comparison Slider Compare two local images with a movable overlay slider; images are not uploaded.

Text Tools Word Counter Count words, lines and paragraphs in your text.

Text Tools Character Counter Count characters with and without spaces.

Text Tools Text Case Converter Convert text to upper, lower, title, sentence or slug case.

Text Tools Text Cleaner Trim text, normalize spaces and remove duplicate or blank lines.

Text Tools Text Diff Checker Compare two texts and identify changed lines.

Text Tools Base64 Encoder / Decoder Encode or decode UTF-8 text with Base64.

Text Tools Sentence Counter Count sentences and paragraphs in pasted text locally.

Text Tools Duplicate Sentence Finder Find repeated sentences locally while preserving their original examples.

Text Tools Text Readability Stats Estimate text length and reading time locally without claiming language-specific readability scores.

Text Tools Markdown Table Generator Convert tab-separated rows into a Markdown table with escaped cell content.

Text Tools Text Similarity Checker Compare two texts with a transparent word-set Jaccard similarity score.

Text Tools Character Frequency Counter Count Unicode code points and show the most frequent characters locally.

Text Tools Word Frequency Visualizer Visualize the most frequent words in pasted text with proportional bars.

Text Tools Random Name Generator Generate random name combinations locally using browser cryptographic randomness.

Text Tools Text Case Comparison Compare uppercase, lowercase, title case and sentence case versions of text.

Text Tools Text to Speech (Local Voices) Read text using locally installed browser speech voices only.

Text Tools Text Translator (Local Dictionary) Translate literal phrases using a user-provided dictionary stored and processed locally; no external translation service is used.

Text Tools Text Summarizer (Extractive) Create a short extractive summary by ranking sentences locally; it does not generate or verify new facts.

Text Tools Grammar Checker (Basic Heuristics) Flag a small set of common repeated-word and punctuation patterns locally; this is not a full grammar or spell checker.

Text Tools Speech to Text (Browser Recognition) Transcribe speech with the browser recognition API after explicit consent; browser vendors may process audio externally.

Text Tools Text Reverser Reverse Unicode grapheme clusters where supported, with a code-point fallback in older browsers.

Text Tools Text Formatter Reflow wrapped paragraphs, normalize spacing, or place detected sentences on separate lines.

Text Tools Text Encoding Converter Convert text to and from binary, hexadecimal, Morse, URL encoding, and HTML entities.

Text Tools Text Analyzer Analyze sentences, repeated words, keywords, and reading statistics locally.

Text Tools Text Generator Generate Lorem Ipsum, UUIDs, random words, sentences, and number lists.

Text Tools Find and Replace Find and replace text with optional case sensitivity and regular expressions.

Text Tools Text Splitter and Joiner Split, join, sort, shuffle, and deduplicate text lines.

Text Tools Markdown Editor Write Markdown and preview safe formatted HTML in your browser.

PDF Tools PDF Merger Merge selected PDF files locally in the browser.

PDF Tools PDF Splitter Extract selected pages from a PDF into a new file.

PDF Tools PDF Compressor Optimize supported PDF documents in your browser.

PDF Tools JPG to PDF Turn one or more images into a downloadable PDF.

PDF Tools PDF to JPG Render PDF pages to downloadable images in your browser.

PDF Tools PDF Page Organizer Delete, reorder, rotate, duplicate, or reverse pages in a PDF locally.

PDF Tools PDF Analyzer and Metadata Inspect PDF page count and size or update standard document metadata.

PDF Tools PDF to Word Extract selectable PDF text into a DOCX file; scanned pages and complex layout are not reconstructed.

PDF Tools Word to PDF Convert text from DOCX or TXT files into a simple locally generated PDF; complex formatting and images are not preserved.

PDF Tools PDF to Excel Export selectable PDF text as spreadsheet rows in an XLSX workbook; table structure is heuristic.

PDF Tools Excel to PDF Render CSV or the first worksheet of an XLSX into paginated PDF pages locally; spreadsheet styling is not preserved.

PDF Tools PDF to PowerPoint Create a PPTX with each PDF page as a slide image; the slides are visual snapshots, not editable text.

PDF Tools PDF OCR Recognize text in scanned PDF pages locally with a packaged OCR engine and a selectable language.

PDF Tools PDF Page Numbering Add sequential page numbers to a local PDF with configurable start, position, and size.

PDF Tools PDF Watermark Add a configurable text watermark to every page of a local PDF.

PDF Tools PDF Signature Draw or type a signature and place it on each page of a local PDF; this is not a digital certificate signature.

PDF Tools PDF Compare Compare selectable text page by page in two local PDFs; visual layout differences are not measured.

PDF Tools PDF Form Filler Fill interactive AcroForm text, checkbox, radio, and dropdown fields in a local PDF.

PDF Tools PDF Table Extractor Group selectable PDF text by page position and export a best-effort CSV table with up to six detected columns.

PDF Tools PDF Crop Tool Set crop margins on every page of a local PDF using percentages of each page size.

PDF Tools PDF Text Extractor Extract selectable text from each page of a local PDF into a downloadable text file.

File Tools ZIP Extractor List and download files from a ZIP archive locally.

File Tools File Type Detector Inspect file signatures, MIME type and size.

File Tools JSON to CSV Convert a JSON array of records to CSV.

File Tools CSV to JSON Parse CSV data and convert rows to JSON.

File Tools XML and JSON Converter Convert well-formed XML and JSON data in your browser.

File Tools YAML and JSON Converter Convert basic JSON-compatible YAML mappings and lists locally.

File Tools CSV and TSV Converter Convert quoted CSV and tab-separated data while preserving fields.

File Tools Base64 File Converter Encode local files to Base64 or decode Base64 into a downloadable file.

File Tools File Hash Generator Calculate SHA-1, SHA-256, SHA-384, and SHA-512 digests for a local file.

File Tools File Size Analyzer Inspect selected file sizes, types, and aggregate totals in your browser.

File Tools Bulk File Renamer Preview safe filename changes for multiple selected files.

File Tools ZIP Creator Create a ZIP archive from selected local files in your browser.

File Tools Excel Viewer Preview the first worksheet of local XLSX files; formulas are not evaluated.

File Tools CSV Viewer Preview local CSV or TSV files as a table with selectable delimiters.

File Tools JSON Tree Viewer Explore JSON objects and arrays in a collapsible tree entirely in your browser.

File Tools XML Formatter Validate and pretty-print XML locally without resolving external entities.

File Tools Log File Analyzer Summarize common log levels and show matching lines from a local log file.

File Tools File Compare Compare two local files byte-for-byte and report their first differing positions.

File Tools Duplicate File Finder Find identical local files by comparing their SHA-256 digests.

File Tools File Splitter Split a local file into size-limited parts and download them in a ZIP archive.

Color Tools Color Picker Select a color and get HEX, RGB and HSL values.

Color Tools Color Palette Generator Generate a harmonious color palette from a base color.

Color Tools Gradient Generator Create a live CSS linear gradient preview.

Color Tools CSS Box Shadow Generator Configure and copy a CSS box shadow with a live preview.

Color Tools Color Format Converter Convert valid HEX, RGB, HSL, and CMYK color values.

Color Tools Color Harmony Generator Generate complementary, analogous, triadic, monochromatic, tint, and shade palettes.

Color Tools Color Contrast Checker Check WCAG contrast ratios and accessibility ratings for two colors.

Color Tools CSS Effects Generator Generate and preview reusable CSS for gradients, shadows, buttons, and surfaces.

Color Tools Image to Palette Extract a small representative color palette from a local image in your browser.

Color Tools Tailwind Color Generator Generate a base-color shade scale and a Tailwind-compatible color configuration locally.

Color Tools CSS Color Variables Generator Convert named color values into CSS custom properties or SCSS variables.

Color Tools Color Blindness Simulator Preview approximate protanopia, deuteranopia, and tritanopia color transformations.

Color Tools Color Gradient Mesh Generator Create a CSS layered radial-gradient mesh from selected colors with a live preview.

Color Tools Brand Color Generator Generate a coordinated starter brand palette from one base color; review choices before use.

Color Tools Color Palette Exporter Export named colors as CSS, SCSS, JSON, or Tailwind configuration.

Color Tools Design Token Generator Convert named colors into a portable JSON design-token structure.

Color Tools Color Temperature Simulator Preview approximate warm and cool illumination effects on a selected color.

Password & Security Password Generator Generate cryptographically secure passwords on this device.

Password & Security Password Strength Checker Estimate password strength locally; input is never uploaded.

Password & Security Text Hash Generator Calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes locally.

Password & Security JWT Decoder Decode JWT header and payload locally without verifying the signature.

Password & Security Secure Token Generator Generate cryptographically secure random tokens locally.

Password & Security Random Bytes Generator Generate cryptographically secure random bytes and export them as hex or Base64.

Password & Security Password Leak Checker Check a password against the public breach corpus with explicit consent using a five-character SHA-1 prefix; never send the password itself.

Password & Security Bcrypt Hash Generator Hash a password locally with bcrypt and a configurable work factor.

Password & Security Argon2id Hash Generator Hash a password locally with Argon2id using configurable memory, iterations, and parallelism.

Password & Security AES-GCM Encryption Tool Encrypt or decrypt local text with AES-GCM using a user-held passphrase and authenticated encryption.

Password & Security RSA Key Pair Generator Generate a local RSA-OAEP key pair and download the public and private keys; private keys are never uploaded or stored by the site.

Password & Security X.509 Certificate Decoder Inspect common X.509 certificate fields locally from a PEM or DER certificate; signature trust is not verified.

Password & Security PEM File Viewer Inspect PEM block labels and safely display decoded text or a hexadecimal preview without storing keys.

Password & Security TOTP Authenticator Generate time-based one-time passwords locally from a manually entered Base32 secret.

Password & Security Passphrase Generator Generate memorable passphrases from the local 2,048-word BIP39 English list using cryptographic randomness.

Password & Security Checksum Verifier Calculate SHA-256, SHA-384, or SHA-512 for a local file and optionally compare an expected digest.

Password & Security HMAC Generator Generate or verify HMAC-SHA-256 locally using a secret key that is never uploaded.

Password & Security Base64 File Encoder Encode or decode a local file or Base64 text with strict size limits; contents are not uploaded.

Password & Security Encryption Playground Explore authenticated AES-GCM encryption and decryption locally with an ephemeral passphrase-derived key.

IP & Network Public IP Checker Check your public IP using ipify; your IP is sent to that provider.

IP & Network IP Address Validator Validate IPv4 and IPv6 addresses and identify private IPv4 ranges.

IP & Network IPv4 Subnet Calculator Calculate network, broadcast, subnet mask, and host range for IPv4 CIDR.

IP & Network Network Transfer Calculator Estimate transfer time and convert common network speed units.

IP & Network Browser and Device Information View browser, screen, locale, and connection information available to this page.

IP & Network DNS Record Lookup Look up common DNS records using Google Public DNS over HTTPS.

IP & Network DNS Propagation Snapshot Compare DNS answers from Google Public DNS and Cloudflare DNS over HTTPS; the domain is sent to both providers only after consent.

IP & Network IPv6 Subnet Calculator Calculate an IPv6 CIDR network and address range locally without contacting a network service.

IP & Network CIDR Calculator Calculate IPv4 or IPv6 CIDR network and address ranges locally.

IP & Network IP Range Calculator Calculate the first and last address and total address count for an IPv4 or IPv6 CIDR range locally.

IP & Network IP Format Converter Validate and normalize IPv4 and IPv6 addresses and show their hexadecimal representation locally.

IP & Network MAC Address Analyzer Analyze a MAC address locally for format, unicast or multicast, and universal or locally administered bits. No vendor lookup is claimed.

IP & Network HTTP Header Checker (Pasted Headers) Review pasted HTTP response headers for common security headers locally; this tool does not fetch websites.

IP & Network Port Reference Lookup Look up common TCP and UDP port references from a small offline list; no ports are scanned.

IP & Network Traceroute Output Viewer Parse traceroute output pasted by the user; this page does not send probes or discover network paths.

IP & Network SSL Certificate Checker (Local File) Inspect a pasted or local X.509 certificate and its validity dates in the browser; this tool does not connect to a domain or establish trust.

IP & Network WHOIS/RDAP Record Viewer (Pasted Data) Extract common domain registration fields from WHOIS or RDAP text pasted by the user; this tool makes no lookup request.

IP & Network Domain Expiration Date Checker (Manual) Calculate the time remaining until a manually entered domain expiration date; it does not query a registrar.

IP & Network Ping Result Viewer (Pasted Output) Summarize packet loss and round-trip times from ping output pasted by the user; browsers cannot send ICMP probes here.

IP & Network ASN RDAP Data Viewer (Pasted JSON) Inspect ASN fields from RDAP JSON pasted by the user; no external registry query is made.

SEO & Website Meta Tag Generator Generate SEO, Open Graph, and social preview tags from your page details.

SEO & Website SEO Content Generators Generate robots.txt, sitemap XML, JSON-LD, and hreflang snippets.

SEO & Website URL Toolkit Parse URLs and create encoded URLs, URL slugs, and UTM campaign links.

SEO & Website Keyword Density Analyzer Count keyword frequency and density in pasted text locally.

SEO & Website HTML Structure Analyzer Inspect pasted HTML for titles, headings, links, images, and missing alt text.

SEO & Website Sitemap XML Validator Validate pasted sitemap XML for structure, absolute URLs and duplicates without fetching external resources.

SEO & Website Robots.txt Validator Check pasted robots.txt syntax and common directive placement issues locally.

SEO & Website Hreflang Validator Inspect pasted HTML hreflang alternate links for valid URLs, language tags and duplicate values.

SEO & Website Open Graph Preview Preview Open Graph sharing details from fields you enter; remote images are not loaded.

SEO & Website Twitter Card Preview Preview Twitter Card details locally without fetching a page or remote image.

SEO & Website Schema Markup Validator Check JSON-LD structure and common required fields locally; no Schema.org data is fetched.

SEO & Website Canonical URL Checker Inspect canonical links in pasted HTML and optionally compare them with an expected URL.

SEO & Website Website Word Counter Count words in pasted page HTML locally after excluding scripts and styles.

SEO & Website Meta Tag Analyzer Inspect title, description, canonical, Open Graph and Twitter tags in pasted HTML.

SEO & Website PageSpeed Report Analyzer Summarize a saved Lighthouse JSON report locally without requesting the website.

SEO & Website Broken Link Checker Find empty links, placeholder anchors and broken in-page fragments in pasted HTML; remote URLs are not checked.

SEO & Website HTTP Status Checker Interpret a pasted HTTP status line or code locally; this tool does not make network requests.

SEO & Website Redirect Chain Analyzer Inspect a manually pasted URL redirect chain for loops and host changes; no requests are made.

Calculator Tools Percentage Calculator Calculate a percentage of a value.

Calculator Tools Scientific Calculator Calculate common scientific functions, powers, roots, logarithms, and trigonometric values locally.

Calculator Tools VAT Calculator Calculate tax, pre-tax amount, and tax-inclusive total.

Calculator Tools Loan Calculator Estimate fixed monthly payments and total interest for a fixed-rate loan.

Calculator Tools Compound Interest Calculator Estimate future value with periodic compounding and regular contributions.

Calculator Tools Simple Interest Calculator Calculate simple interest and total amount from principal, rate, and time.

Calculator Tools Profit Margin Calculator Calculate profit and profit margin from revenue and cost.

Calculator Tools Discount Calculator Calculate a sale price and savings from an original price and discount rate.

Calculator Tools BMI Calculator Calculate body mass index from metric height and weight.

Calculator Tools Unit Price Calculator Compare product prices by calculating cost per unit.

Calculator Tools Age Calculator Calculate elapsed years, months, and days between two dates.

Calculator Tools Tip Calculator Calculate a tip amount and total bill from a bill and tip rate.

Calculator Tools Split Bill Calculator Split a bill evenly among people, including an optional tip.

Calculator Tools Fuel Cost Calculator Estimate trip fuel use and cost from distance, efficiency, and fuel price.

Calculator Tools Electricity Cost Calculator Estimate electricity cost from power, usage time, days, and unit price.

Calculator Tools Percentage Change Calculator Calculate the relative percentage increase or decrease between two values.

Calculator Tools Average Calculator Calculate count, sum, mean, median, and range from a list of numbers.

Calculator Tools Weighted Average Calculator Calculate a weighted average from lists of values and weights.

Calculator Tools Ratio Calculator Simplify a positive integer ratio using the greatest common divisor.

Calculator Tools Rule of Three Calculator Solve a direct proportion when three values are known.

Calculator Tools Salary Calculator Convert gross pay from hourly, weekly, biweekly, monthly, or annual periods into annual, monthly, and hourly equivalents.

Calculator Tools Mortgage Calculator Estimate a fixed-rate mortgage payment plus user-entered property tax, insurance, and HOA costs.

Calculator Tools Loan Amortization Calculator Calculate fixed monthly payments and a complete monthly principal, interest, and balance schedule.

Calculator Tools Investment Return Calculator Calculate total and annualized return from initial and ending values over a stated period; not investment advice.

Calculator Tools Currency Profit Calculator Estimate currency exchange profit or loss using entered buy and sell rates and a selling fee.

Calculator Tools Tax Calculator Calculate a custom tax amount and total from a user-entered rate, either added to a subtotal or extracted from a tax-inclusive amount.

Developer Tools JSON Formatter Validate and pretty-print JSON locally with configurable indentation.

Developer Tools Regex Tester Test a JavaScript regular expression against text and list matching results.

Developer Tools URL Encoder / Decoder Encode or decode URL components locally.

Developer Tools HTML Entity Converter Encode special characters as HTML entities or decode entities locally.

Developer Tools Cron Expression Helper Validate standard five-field cron expressions and choose common schedules.

Developer Tools Code Line Counter Count total, non-empty, and blank lines in pasted text locally.

Developer Tools Gitignore Generator Create a starter .gitignore from common project and operating-system templates.

Developer Tools HTTP Status Reference Search a concise reference of common HTTP status codes.

Developer Tools MIME Type Lookup Look up common file extensions and MIME types in a local reference.

Developer Tools CSS Flexbox Generator Configure a responsive flexbox layout and preview the generated CSS.

Developer Tools CSS Grid Generator Configure a CSS grid layout and preview the generated CSS.

Developer Tools CSS Clamp Generator Generate a fluid CSS clamp() value from size and viewport limits.

Developer Tools Unix Timestamp Converter Convert Unix timestamps to readable dates and dates to Unix seconds.

Developer Tools UUID Generator Generate RFC 4122 version 4 UUIDs locally with cryptographic randomness.

Developer Tools UUID Validator Check whether each pasted value is a valid UUID string.

Developer Tools JSON Schema Generator Infer a basic JSON Schema from a sample JSON value locally.

Developer Tools JSON Schema Validator Validate JSON against a clearly documented subset of JSON Schema keywords.

Developer Tools SQL INSERT Generator Generate parameter-free SQL INSERT statements from flat JSON records with validated identifiers.

Developer Tools CSS Border Radius Generator Build a CSS border-radius value with a live preview.

Developer Tools CSS Transform Generator Compose translate, rotate, scale and skew transforms with a live preview.

Developer Tools CSS Animation Generator Generate a small CSS animation snippet from built-in safe presets.

Developer Tools JSON to XML Converter Convert JSON into escaped XML elements using a configurable root element.

Developer Tools XML to JSON Converter Convert XML into JSON with repeated elements represented as arrays.

Developer Tools HTML Formatter Indent and format HTML fragments locally; browser parsing may normalize markup.

Developer Tools HTML Minifier Remove inter-tag whitespace from HTML fragments locally; whitespace-sensitive layouts may change.

Developer Tools CSS Formatter Apply readable indentation and spacing to CSS without executing it.

Developer Tools CSS Minifier Conservatively remove redundant whitespace from CSS while retaining comments.

Developer Tools JavaScript Formatter Apply best-effort indentation and spacing while preserving strings and comments; this is not a full parser.

Developer Tools JavaScript Minifier Conservatively remove redundant whitespace while preserving strings and comments; this is not a full parser.

Developer Tools SQL Formatter Format common SQL clauses locally; dialect-specific syntax may require manual review.

Developer Tools SQL Minifier Conservatively compact SQL whitespace while preserving quoted strings and comments.

Developer Tools Markdown to HTML Convert common Markdown headings, lists, emphasis, links, and code to escaped HTML locally.

Developer Tools HTML to Markdown Convert common HTML headings, paragraphs, links, lists, and emphasis to Markdown locally.

Developer Tools Webhook Tester (Request Preview) Validate and preview a webhook request and JSON payload locally; no network request is sent.

Developer Tools Code Snippet Manager Save, edit, search, and export code snippets in this browser using local storage.

Developer Tools htaccess Generator Generate a starter Apache .htaccess file from selected common options for manual review.

Developer Tools Nginx Config Generator Generate a basic static-site server block from a validated domain and document root.

Developer Tools YAML Validator (Basic Subset) Check common indentation, mapping, list, and scalar syntax locally; this is not a full YAML 1.2 parser.

Developer Tools SQL CREATE TABLE Generator Generate a CREATE TABLE statement from validated identifiers and a limited set of column types.

Developer Tools SQL Query Builder Build a parameterized SELECT query with validated identifiers and a separate value binding.

Developer Tools API Response Formatter Format pasted API response JSON or text with user-entered status and headers; no request is sent.

Developer Tools User Agent Parser Summarize common browser, operating system, and device hints from pasted user-agent text locally.

Developer Tools Regex Library Browse a small curated set of common regular expressions with their limitations and examples.

Developer Tools HTML Preview Playground Preview HTML and CSS in a sandboxed frame with scripts and external network resources blocked.

Productivity Tools Pomodoro Timer Run a configurable focus and break timer in this browser tab.

Productivity Tools Countdown Timer Start a countdown with pause, resume, and reset controls.

Productivity Tools Stopwatch Measure elapsed time with start, pause, lap, and reset controls.

Productivity Tools Random Picker Choose one item uniformly from a list using the browser random source.

Productivity Tools Decision Wheel Choose one of several user-entered options at random in the browser.

Productivity Tools Break Reminder Timer Run a local work-and-break timer that remains accurate when browser timers are throttled.

Productivity Tools World Clock View the current date and time in common time zones.

Productivity Tools Work Hours Calculator Calculate elapsed work hours between start and end times, subtracting an optional break.

Productivity Tools Event Countdown Calculate the remaining time until a chosen local date and time.

Productivity Tools Random Team Generator Shuffle a list of names locally into a selected number of teams.

Productivity Tools Date Add / Subtract Calculator Add or subtract whole calendar days from a selected date.

Productivity Tools Business Days Calculator Count weekdays between two dates inclusively; public holidays are not excluded.

Productivity Tools Time Duration Calculator Calculate elapsed time between two local times with an optional break.

Productivity Tools Weekly Planner Plan a week with notes saved locally in this browser.

Productivity Tools Habit Tracker Track daily habit completion locally for the current week.

Productivity Tools Interval Timer Run alternating work and rest intervals for a chosen number of rounds.

Productivity Tools Calendar Event File Generator Create a downloadable local calendar event file (.ics) from entered details.

Productivity Tools Multi-Time-Zone Clock Compare current times across selected time zones in your browser.

Productivity Tools ISO Week Number Calculator Find the ISO week number and week-year for a selected calendar date.

Productivity Tools Time Block Planner Create a simple timed work and break schedule from a start time.

Productivity Tools Task Priority Matrix Sort tasks into urgency and importance quadrants locally.

Productivity Tools Reading Goal Calculator Estimate pages to read per day to meet a target date.

Productivity Tools Pomodoro Schedule Calculator Estimate total focus and break time for a chosen number of Pomodoro sessions.

Productivity Tools Local Billable Hours Tracker Track date, task, and billable hours locally in this browser.

Productivity Tools Private Local Notepad Write notes saved only in this browser using local storage.

Productivity Tools To-do List Create and complete a to-do list stored locally in this browser.

Productivity Tools Date Difference Calculator Find the exact difference in days between two calendar dates.

Education Tools Prime Number Checker Check whether an integer is prime and list its factors if composite.

Education Tools GCD & LCM Calculator Calculate the greatest common divisor and least common multiple of integers.

Education Tools Temperature Converter Convert temperatures between Celsius, Fahrenheit, and Kelvin.

Education Tools Grade Calculator Calculate score percentage and compare it with a configurable threshold.

Education Tools Length Unit Converter Convert common metric and imperial length units.

Education Tools Fraction Calculator Add, subtract, multiply, and divide two fractions.

Education Tools Roman Numeral Converter Convert integers from 1 to 3999 to Roman numerals and back.

Education Tools Number Base Converter Convert integers between bases 2 and 36.

Education Tools Multiplication Table Generator Generate a multiplication table for an integer with a selectable length.

Education Tools Square Root Calculator Calculate the real square root of a non-negative number.

Education Tools Scientific Notation Converter Convert a finite number to normalized scientific notation.

Education Tools Prime Factorization Calculator Find the prime factorization of a whole number up to one trillion.

Education Tools GPA Calculator Calculate a credit-weighted GPA on a 0–4 scale from entered grade points.

Education Tools Study Time Calculator Estimate total study time from daily minutes, days per week, and weeks.

Education Tools Quadratic Equation Solver Solve a quadratic equation and report its real or complex roots.

Education Tools Factorial Calculator Calculate an integer factorial exactly using BigInt.

Education Tools Probability Calculator Calculate probability from favorable and total outcomes.

Education Tools Circle Calculator Calculate circle circumference and area from its radius.

Education Tools Triangle Calculator Calculate triangle perimeter and area from three valid side lengths.

Education Tools Average Speed Calculator Calculate average speed from distance in kilometers and time in hours.

Education Tools Prime Number List Generator List prime numbers up to a chosen limit using the Sieve of Eratosthenes.

Education Tools Permutation & Combination Calculator Calculate nPr and nCr exactly for whole-number inputs.

Education Tools Pythagorean Theorem Calculator Calculate the hypotenuse from two positive legs of a right triangle.

Education Tools Slope Calculator Calculate line slope and intercept from two points.

Education Tools Mode Calculator Find the mode or modes in a list of numbers.

Education Tools Percentage Learning Tool Practice percentage problems with a worked calculation shown after submission.

Education Tools Vocabulary Trainer Create a private local vocabulary deck, shuffle cards, and reveal translations.

Education Tools Random Learning Topic Picker Pick a topic from a curated local set of math, science, history, and language prompts.

Business & Finance Markup Calculator Calculate a selling price from cost and markup percentage.

Business & Finance Break-even Calculator Estimate units and revenue needed to cover fixed costs.

Business & Finance Commission Calculator Calculate commission and total earnings from sales and a rate.

Business & Finance ROI Calculator Calculate net return and ROI from investment cost and value.

Business & Finance Cash Flow Calculator Summarize inflows, outflows, and net cash flow for a period.

Business & Finance Freelance Rate Calculator Estimate a minimum hourly rate from income, expenses, and billable capacity.

Business & Finance Subscription Cost Calculator Estimate recurring subscription cost for a selected number of seats and years.

Business & Finance Revenue Forecast Calculator Project revenue using a constant monthly growth assumption.

Business & Finance Inventory Value Calculator Estimate inventory value from quantity and unit cost.

Business & Finance Sales Target Calculator Calculate remaining revenue and whole sales needed to reach a target.

Business & Finance Installment Calculator Estimate fixed monthly payments for a principal, rate, and term.

Business & Finance Straight-Line Depreciation Calculator Estimate annual straight-line depreciation and ending book value.

Business & Finance Cash Runway Calculator Estimate how many months cash lasts at the entered monthly burn rate.

Business & Finance Contribution Margin Calculator Calculate contribution margin per unit and contribution margin ratio.

Business & Finance Gross Margin Calculator Calculate gross profit and gross margin from revenue and cost of goods sold.

Business & Finance Net Profit Margin Calculator Calculate net profit and net profit margin from revenue and expenses.

Business & Finance Hourly to Annual Salary Calculator Estimate gross annual pay from hourly pay, weekly hours, and working weeks.

Business & Finance Annual Salary to Hourly Calculator Estimate gross hourly pay from annual salary, weekly hours, and working weeks.

Business & Finance Sales Tax Calculator Calculate tax amount and total from a pre-tax price and tax rate.

Business & Finance Working Capital Calculator Calculate working capital as current assets minus current liabilities.

Business & Finance Debt-to-Equity Calculator Calculate total debt divided by entered equity.

Business & Finance Cash Conversion Cycle Calculator Estimate cash conversion cycle from inventory, receivable, and payable days.

Business & Finance Inventory Turnover Calculator Calculate inventory turnover and days on hand from cost of goods sold and average inventory.

Business & Finance Operating Margin Calculator Calculate operating income and operating margin from revenue and operating expenses.

Business & Finance Target Margin Pricing Calculator Calculate a selling price from unit cost and a target gross margin.

Business & Finance Private Expense Tracker Record dated expenses in browser storage and export the records as CSV.

Marketing & Social Media CPM Calculator Calculate campaign cost per thousand impressions.

Marketing & Social Media CPC Calculator Calculate average cost per click from campaign spend and clicks.

Marketing & Social Media CTR Calculator Calculate click-through rate from clicks and impressions.

Marketing & Social Media Conversion Rate Calculator Calculate the observed conversion rate from visits and conversions.

Marketing & Social Media A/B Test Rate Comparator Compare observed conversion rates and uplift between two variants; it does not test statistical significance.

Marketing & Social Media UTM Campaign Builder Build a URL with properly encoded UTM campaign parameters.

Marketing & Social Media Hashtag Generator Turn keywords into normalized social media hashtags locally.

Marketing & Social Media ROAS Calculator Calculate gross revenue divided by advertising spend.

Marketing & Social Media CPA Calculator Calculate advertising cost per conversion.

Marketing & Social Media Customer Acquisition Cost Calculator Estimate sales and marketing cost per new customer.

Marketing & Social Media Cost per Lead Calculator Calculate campaign spend per lead.

Marketing & Social Media Email Open Rate Calculator Calculate observed email opens per delivered message.

Marketing & Social Media Engagement Rate Calculator Calculate observed social interactions per follower.

Marketing & Social Media Email Click Rate Calculator Calculate unique clicks per delivered email.

Marketing & Social Media Email Bounce Rate Calculator Calculate bounced messages as a share of sent messages.

Marketing & Social Media Email Unsubscribe Rate Calculator Calculate unsubscribes per delivered email.

Marketing & Social Media Campaign Frequency Calculator Calculate average impressions per reached person.

Marketing & Social Media Marketing Funnel Calculator Calculate stage-to-stage and overall conversion rates for a simple funnel.

Marketing & Social Media Ad Budget Split Calculator Allocate a total advertising budget across three channels by percentage.

Marketing & Social Media Campaign Reach Estimator Estimate reached audience from impressions and average frequency.

Marketing & Social Media YouTube Title Generator Create local title ideas from simple templates based on a topic and audience; no AI claims are generated.

Marketing & Social Media Social Media Bio Generator Format a concise social bio from user-provided name, role, value, and call to action.

Marketing & Social Media TikTok Caption Generator Build a caption from user-provided topic, hook, call to action, and keywords using local templates.

Marketing & Social Media Content Calendar Generator Schedule user-provided topics on selected dates and export a local CSV calendar.

Marketing & Social Media Marketing Campaign Planner Create a dated campaign checklist from user inputs without inventing performance forecasts.

Marketing & Social Media Social Media Character Counter Count Unicode code points and compare with approximate platform text limits; actual platform counting may differ.

Marketing & Social Media YouTube Description Formatter Format user-provided summary, links, chapters, and hashtags into a YouTube description locally.

Marketing & Social Media YouTube Tag Formatter Normalize and deduplicate user-provided tags within YouTube’s 500-character tag limit.

Marketing & Social Media Caption Formatter Clean caption spacing and format user-provided hashtags without generating engagement claims.

Marketing & Social Media Social Media Posting Time Planner Schedule posts at user-selected dates and times; it does not claim optimal engagement times.

Marketing & Social Media YouTube Thumbnail Preview Preview a YouTube video thumbnail after explicit consent to load the image from YouTube.

Marketing & Social Media Instagram Grid Planner Split a local image into nine square Instagram grid tiles and export them as a ZIP.

Marketing & Social Media Affiliate Commission Calculator Estimate total sales and commission from user-entered average sale amount, commission rate, and number of sales.

Marketing & Social Media QR Marketing Campaign Builder Build a tagged campaign URL and encode it as a downloadable QR code locally.

Marketing & Social Media Social Media Image Resizer Resize a local image to common social platform dimensions and download the result.

Marketing & Social Media Social Media Post Preview Preview user-provided post text in a simple local platform-style card; no network posting occurs.

Marketing & Social Media Campaign Budget Calculator Calculate total and per-day campaign budget from a user-entered amount and duration.

Marketing & Social Media Influencer Rate Calculator Estimate a quote using a user-entered rate per thousand followers and deliverable count, not market data.

Marketing & Social Media Affiliate Link Builder Add a user-defined affiliate parameter to a validated HTTP or HTTPS destination URL.

Marketing & Social Media Content Idea Generator Create topic prompts from local templates based on a user-entered subject; no AI claims are generated.

Marketing & Social Media Ad Copy Generator Arrange user-provided product, benefit, and call to action into local ad copy templates.

Audio Tools Audio Cutter Cut a browser-supported audio file to a selected time range and export WAV.

Audio Tools Audio Merger Join browser-supported audio files sequentially and export a WAV file.

Audio Tools Audio to WAV Converter Decode a browser-supported audio file locally and export uncompressed WAV.

Audio Tools Audio Speed Changer Change playback speed locally and export the resampled audio as WAV.

Audio Tools Audio Volume Booster Apply a selected gain locally and export WAV with peak clipping.

Audio Tools Audio Reverser Reverse a browser-supported audio file locally and export WAV.

Audio Tools Audio Normalizer Normalize the peak level of local audio to a conservative target and export WAV.

Audio Tools Audio Fade In / Out Apply a linear fade-in and/or fade-out and export WAV locally.

Audio Tools Audio Channel Converter Convert decoded audio to mono or stereo WAV locally.

Audio Tools Audio Waveform Generator Create and download a waveform preview of a local audio file.

Audio Tools Audio Recorder Record up to 60 seconds from your microphone and download the browser-supported audio file.

Audio Tools Audio Pitch Changer Shift pitch by resampling locally; playback speed and output duration change as well.

Audio Tools Audio Leading/Trailing Silence Trimmer Detect and remove leading and trailing audio below a chosen threshold.

Audio Tools Audio Dynamic Compressor Apply browser-native dynamic-range compression and export WAV locally.

Audio Tools Audio Equalizer Apply a selected low-shelf, high-shelf or band-pass filter locally.

Audio Tools Audio Signal Analyzer Measure local audio duration, channels, sample rate, peak level, RMS, and near-silent frame ratio.

Audio Tools Audio Sample Rate Converter Resample decoded audio to a selected common WAV sample rate.

Audio Tools Audio Bit Depth Converter Export local audio as 8-bit, 16-bit, or 24-bit PCM WAV.

Audio Tools Audio Mixer Mix two locally decoded audio tracks with separate gain controls into a WAV file.

Audio Tools Audio Stereo Panner Pan local audio between left and right stereo channels and export WAV.

Audio Tools Audio Metadata Editor (MP3 ID3) Write common text tags as ID3v2.3 metadata into an MP3 file locally; other audio formats are not modified.

Audio Tools MP3 Tag Editor Edit common ID3v2.3 text tags in an MP3 file locally without re-encoding its audio.

Video Tools Video Screenshot Capture a still frame from a local video at a chosen timestamp.

Video Tools Video Metadata Viewer Inspect local video duration, dimensions, and playback metadata.

Video Tools Video Aspect Ratio Calculator Reduce video dimensions to an aspect ratio and calculate a matching height for a target width.

Video Tools Video Bitrate Calculator Estimate average video bitrate from target size, duration, audio bitrate, and container overhead.

Video Tools Video Frame Count Calculator Estimate frame count from duration and frames per second.

Video Tools Video Timecode and Frame Converter Convert elapsed video time to frame counts or frame counts to elapsed time at common frame rates.

Video Tools Video Thumbnail Generator Capture a selected video frame and export a resized PNG or JPEG thumbnail locally.

Video Tools Video Frame Extractor Extract evenly spaced frames from a local video into a ZIP of JPEG images.

Video Tools Video Contact Sheet Generator Create a labeled contact sheet from evenly spaced frames of a local video.

Video Tools Video Converter (Browser Capture) Re-encode short local videos to a format supported by browser MediaRecorder; available codecs depend on the browser.

Video Tools Video Compressor (Browser Capture) Re-encode short local videos with a selected resolution and target bitrate; output size depends on browser encoder support.

Video Tools Video to GIF Create a looping GIF from up to 10 seconds of browser-supported local video, with a 3-3-2 color palette and a 100-frame limit.

Video Tools GIF to Video (Browser Capture) Record an animated local GIF for a selected duration as a silent video in a format supported by browser MediaRecorder.

Video Tools SRT Subtitle Delay Adjuster Shift all SRT subtitle cues by a positive or negative time offset locally.

Video Tools Video Trimmer (Browser Capture) Trim a short local video segment by recording browser-supported playback; output codecs depend on the browser.

Video Tools Video Speed Changer (Browser Capture) Record local video playback at a selected speed; audio and output codec depend on browser capture support.

Video Tools Video Audio Extractor (Browser Capture) Record a short audio track from local video playback; audio track and output format depend on browser support.

Video Tools SRT to WebVTT Converter Convert valid SRT subtitle cues to a downloadable WebVTT text file locally.

Video Tools WebVTT to SRT Converter Convert WebVTT cue timestamps and text into a downloadable SRT subtitle file locally.

Video Tools Video Resizer (Browser Capture) Resize short local videos by recording browser playback through a canvas; output codec depends on browser support.

Video Tools Video Cropper (Browser Capture) Crop short local videos to a selected percentage region using browser playback capture.

Video Tools Video Rotator (Browser Capture) Rotate short local videos by 90, 180, or 270 degrees through browser playback capture.

Video Tools Video Loop Maker (Browser Capture) Repeat a short local video up to three times using browser playback capture.

Video Tools Video Watermark Tool (Browser Capture) Overlay a text watermark on a short local video while recording browser playback.

Video Tools Video Subtitle Editor Edit SRT or WebVTT subtitle cues locally, validate timing, and export the edited subtitles.

Video Tools Video Aspect Ratio Converter (Browser Capture) Convert a short local video to a common aspect ratio by cropping or adding black bars during browser capture.

Video Tools Video Merger (Browser Capture) Join up to five short local videos in sequence by recording browser playback; output codec depends on browser support.

Database Schema Designer Database Schema Designer Design multi-table schemas with indexes and foreign keys; export SQL for MySQL, MariaDB, PostgreSQL, SQLite, or SQL Server, plus JSON, documentation, or ER diagrams.

Landing Page Builder Landing Page Builder Arrange reusable landing page sections, preview the result, and export a static HTML file.

Chart & Data Visualization Chart & Data Visualization Create bar, line, or pie charts from pasted CSV-formatted data or manual values.

Form Builder Form Builder Compose a basic form from common fields, preview it, and export HTML or JSON.

Visual Workflow Builder Visual Workflow Builder Arrange predefined text-processing steps into a local workflow, then run or export it.

API Playground API Playground Compose and validate an HTTP request locally, then export its JSON configuration or a fetch example. Requests are not sent and credentials are not stored.

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