All tools
79 free tools that run entirely in your browser — nothing is uploaded and nothing needs an account. Jump to a category:
Developer Tools
Inspect, format, validate, and transform developer-friendly data.
Base64 Encode/Decode
UTF-8 safe Base64 encoding and decoding with instant validation.
OpenColor Picker/Converter
Convert HEX, RGB and HSL, pick a color visually, and check WCAG contrast ratios.
OpenCron Expression Explainer
Explain a cron schedule in plain English and show its next run times.
OpenCSV ↔ JSON Converter
Convert spreadsheet CSV data and JSON arrays back and forth, with type inference.
OpenHTML Formatter
Beautify or minify HTML, with script/style/pre content always left untouched.
OpenJSON Viewer
Paste, format, validate, and inspect JSON with a collapsible local tree view.
OpenJWT Decoder
Paste a JWT to see its decoded header and payload, with claim timestamps humanized.
OpenMarkdown Previewer
Live preview of GitHub-flavored Markdown, with tables, task lists, and a Copy HTML button.
OpenRegex Tester
Test regex patterns with live match highlighting, capture groups, and a replace preview.
OpenSQL Formatter
Beautify SQL queries with dialect-aware formatting and keyword casing.
OpenText & JSON Diff Checker
Line-by-line text diff, with a JSON mode that ignores formatting and key order.
OpenURL Encode/Decode
Percent-encode or decode full URLs or individual query components.
OpenYAML ↔ JSON Converter
Convert config files between YAML and JSON, including multi-document YAML.
OpenImage Tools
Resize, convert, and optimize images directly in the browser.
Background Remover
Remove a solid or edge-connected background from a photo, refine tolerance, click to resample, and download a transparent PNG.
OpenCrop Image
Drag to crop, pick a ratio like 1:1 or 16:9, or set an exact size in pixels.
OpenHEIC Converter
Convert HEIC/HEIF photos to JPG or PNG — one file, or a zip for a batch. Nothing uploaded.
OpenImage Format Converter
Convert WebP, PNG, JPG, AVIF, SVG or HEIC to JPG, PNG or WebP — one file, or a zip for a batch. Nothing uploaded.
OpenImage Resizer
Compress a photo to a target size in KB for a form upload, or scale it to exact dimensions — JPG, PNG, WebP and HEIC, nothing uploaded.
OpenImage to Text
Add an image, get the text as something you can copy or save — OCR runs on your device, nothing uploaded. English.
OpenPassport Photo Maker
Upload a photo, line the head up with the guides, and download a print-ready passport photo at the exact mm size — plus a print sheet. Nothing uploaded.
OpenPhoto Duplicate Finder
Groups duplicate and near-duplicate photos so you can see what to clean up. Never deletes anything.
OpenPhoto Editor
Crop, rotate/flip, adjust, and apply a quick filter to a photo, then download it.
OpenPhoto Organizer
Pick a folder, organize photos and videos into dated event folders, and clean up burst duplicates — entirely on your device.
OpenVideo Compressor
Reduce video file size with local bitrate presets, sample estimates, and MP4/WebM download depending on browser support.
OpenVideo Editor
Trim, rotate, crop, and mute a video, then download the result.
OpenPDF Tools
Merge, split, and transform PDF documents without heavy setup.
Document Scanner
Photograph or upload a document, straighten it, and export a clean multi-page PDF.
OpenJPG to PDF
Add images, drag them into order, and download one PDF — one image per page, nothing uploaded.
OpenPDF Compressor
Compress a PDF to a target size in KB for an upload limit — rendered and rebuilt on your device, nothing uploaded.
OpenPDF to JPG
Turn each PDF page into a JPG or PNG — one file for a single page, a zip for more.
OpenPDF Toolkit
A private, client-side toolkit to merge, split, rotate, organize, and edit PDF files.
OpenFinance Tools
Run practical finance calculations with fast, focused utilities.
Compound Interest Calculator
Project final amount and interest earned across common compounding frequencies.
OpenGST Calculator
Add or remove GST at 5%, 18%, 40% or any rate, with CGST, SGST and IGST shown.
OpenLoan / EMI Calculator
Reducing-balance EMI calculation from loan amount, interest rate, and tenure.
OpenSIP Calculator
Mutual fund SIP and lump-sum returns with a step-up option and a year-by-year table.
OpenTip Calculator
Quick tip percentages, total bill, and per-person split.
OpenHealth Tools
Use privacy-friendly calculators for everyday health checks.
Converters
Convert units and values quickly across everyday categories.
Cooking Measurement Converter
Convert teaspoons, tablespoons, cups, fluid ounces, milliliters, grams, ounces and pounds.
OpenData Storage Converter
Convert bytes, KB, MB, GB and TB with 1000-based or 1024-based storage math.
OpenDate Format Converter
Convert a date between ISO, US, EU, Unix seconds/milliseconds, UTC and spoken formats.
OpenLand Area Converter
Convert bigha, acre, kanal, marla and other Indian land units, plus lakh and crore numbers.
OpenNumber Base Converter
Convert base 2, base 8, base 10 and base 16 numbers, including very large integers.
OpenTime Zone Converter
Pick a date/time and convert it from one timezone to another, with UTC ISO output.
OpenUnit Converter
Convert between metric and imperial length, weight, volume, and temperature units.
OpenText Tools
Clean, compare, and transform text with minimal friction.
Case Converter
Switch text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
OpenDuplicate Line Remover
Strip duplicate lines from a list, with case, whitespace, and blank-line options.
OpenFind & Replace
Replace every match of a word or pattern in text, with a live match count and regex support.
OpenLine Sorter
Sort lines alphabetically, by length, or by the number in each line, with dedup options.
OpenLorem Ipsum Generator
Generate paragraphs or sentences of classic Lorem Ipsum placeholder text.
OpenText Reverser
Reverse text character by character, flip word order, or reverse line order.
OpenText to Slug Converter
Convert a title into a lowercase, URL-safe slug with a custom separator.
OpenWhitespace Cleaner
Trim lines, collapse extra spaces and blank lines, and convert or remove tabs.
OpenWord & Character Counter
Live word, character, sentence, and reading-time stats as you type or paste.
OpenDate & Time
Calculate ages, durations, and useful date or time differences.
Age Calculator
Get exact age in years, months, and days, plus totals and next birthday countdown.
OpenCountdown Timer
Live countdown in days, hours, minutes, and seconds to a date you pick.
OpenDate Difference Calculator
Calendar-accurate years/months/days between two dates, plus total days and weeks.
OpenTimestamp Converter
Two-way conversion between Unix timestamps (seconds or ms) and local/UTC/ISO dates.
OpenMath Tools
Solve common numeric tasks with lightweight browser tools.
Average & Standard Deviation Calculator
Mean, median, mode, range, and population/sample standard deviation, all at once.
OpenFraction Calculator
Add, subtract, multiply, or divide fractions, simplified automatically.
OpenGCD & LCM Calculator
Find the GCD and LCM of two or more whole numbers at once.
OpenPercentage Calculator
Find X% of Y, what percent X is of Y, and percentage change between two numbers.
OpenQuadratic Equation Solver
Solve a quadratic equation for its roots, discriminant, vertex, and axis of symmetry.
OpenRatio Calculator
Simplify a ratio to lowest terms, or solve A:B = C:D for a missing value.
OpenScientific Calculator
Type or tap an expression with trig, log, powers, and roots, and see the result live.
OpenGenerators
Generate QR codes, passwords, IDs, and other helper values.
Password Generator
Create random passwords with adjustable length and character sets, scored for strength.
OpenQR Code Generator
Turn a URL, text, Wi-Fi network, or contact into a scannable QR code — download as PNG or SVG.
OpenRandom Number Generator
Pick one or many random numbers between a min and max, with or without duplicates.
OpenUUID Generator
Bulk-generate UUID v4 values with optional uppercase and hyphen formatting.
OpenSecurity
Decode or inspect tokens and values without sending them away.
Productivity
Small utilities that remove repetitive work from daily tasks.
Device Tests
Check that your microphone, webcam and keyboard work before a call, a class or a purchase.
Keyboard Tester
On-screen keyboard that lights up each key you press, with key details and rollover count.
OpenMic Test
Live mic level meter, device picker and a 5-second record-and-play check.
OpenWebcam Test
Live camera preview with resolution, frame rate, camera switching and a snapshot.
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