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Every everyday tool. Instant, free, and in your browser.
87 free calculators, converters, text, developer, image and PDF tools, plus an AI lab. Type or drop in your data, get the answer, and nothing is sent to a server by our tools.
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32 tools
Calculators & Converters
Everyday maths done for you: convert units, work out money, health and study numbers, and do date and time arithmetic.
Browse calculators tools 14 toolsText Tools
Count, clean, compare, convert and generate text without uploading it anywhere.
Browse text tools 14 toolsDeveloper Tools
Format, encode, decode, hash and test, with nothing sent to a server. Safe to use on real tokens and payloads.
Browse developer tools 12 toolsImage & Design Tools
Compress, resize and convert pictures, make QR codes and work with colors. Your files never leave your device.
Browse images tools 10 toolsPDF & Document Tools
Merge, split, view, convert and compress PDFs, and create invoices and resumes as PDF, without uploading your documents.
Browse pdf tools 5 toolsBrowser AI & Simulations
Small, honest AI experiments that run on your device: train, teach, play and explore how machines learn.
Browse ai lab toolsFeatured tools
- Image to PDF ConverterTurn JPG, PNG and WebP images into one PDF, in any order.
- Merge PDFCombine several PDF files into one, in the order you choose.
- JSON Formatter & ValidatorFormat, minify and validate JSON with clear error positions.
- Image CompressorShrink JPG, PNG and WebP images in your browser. No upload.
- QR Code GeneratorMake a QR code for a link or text. Download as PNG or SVG.
- Resume / CV BuilderBuild a clean, ATS-friendly resume or CV and download it as PDF.
- Word CounterCount words, characters, sentences and paragraphs, plus reading time.
- Hugging Face Trends DashboardLive trending, most downloaded and newest AI models and Spaces on Hugging Face.
All 87 tools
Calculators & Converters
- Percentage CalculatorPercent of a number, percent change, increase and decrease, reverse percent.
- Age CalculatorExact age in years, months and days, plus days until your next birthday.
- Days Between Dates CalculatorDays, weeks and weekdays between two dates, or add/subtract days from a date.
- GPA CalculatorSemester and cumulative GPA on the 4.0 scale, with honors/AP weighting.
- Tip CalculatorWork out the tip and split the bill between any number of people.
- Loan Payment CalculatorMonthly payment, total interest and yearly breakdown, with extra-payment savings.
- Length ConverterConvert cm to inches, feet to meters, miles to km and more.
- Weight ConverterConvert kg to pounds, ounces to grams, stone and more.
- Temperature ConverterConvert Celsius, Fahrenheit, Kelvin and Rankine.
- Volume ConverterConvert cups, mL, liters, gallons, fluid ounces and spoons.
- Speed ConverterConvert mph, km/h, m/s, knots and ft/s.
- Data Storage ConverterConvert bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB.
- Roman Numeral ConverterConvert numbers to Roman numerals and back, from 1 to 3999.
- Compound Interest CalculatorSee how savings grow with compounding and monthly deposits.
- Discount CalculatorFind the sale price, savings, or percent off. Stack two discounts.
- Sales Tax CalculatorAdd sales tax / VAT to a price, or take it out of a total.
- Hourly to Salary CalculatorConvert hourly pay to annual salary, or salary to an hourly rate.
- Debt Payoff CalculatorCompare snowball and avalanche plans and see your debt-free date.
- BMI CalculatorBody mass index, category and healthy weight range, metric or imperial.
- TDEE & Calorie CalculatorEstimate BMR and daily maintenance calories for weight loss or gain.
- Running Pace CalculatorWork out pace per km and mile, or the finish time for a pace.
- Final Grade CalculatorSee what score you need on your final exam to reach a target grade.
- Add Days to Date CalculatorAdd or subtract days, weeks, months or years from any date.
- Working Days CalculatorCount Monday–Friday working days between two dates, minus holidays.
- Time Zone ConverterConvert a date and time between world time zones with DST handled.
- Pomodoro TimerA simple focus timer: 25-minute sessions with short and long breaks.
- Random Number GeneratorGenerate random whole numbers or decimals in any range, with or without repeats.
- Random Name PickerPick random winners from a list, shuffle it, flip a coin or roll dice.
- Unit Price Comparison CalculatorCompare pack sizes to find the cheapest price per kg, litre or item.
- EMI CalculatorMonthly EMI, total interest and a yearly schedule for any loan.
- Countdown TimerCount down minutes or to a date and time, with an alarm sound.
- Online Stopwatch with LapsPrecise stopwatch with lap and split times and keyboard shortcuts.
Text Tools
- Word CounterCount words, characters, sentences and paragraphs, plus reading time.
- Case ConverterUPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more.
- Reading Time CalculatorEstimate how long an article or script takes to read, with image time and custom speed.
- Remove Duplicate LinesDelete repeated lines from a list, with trim, case and sort options.
- URL Slug GeneratorTurn a title into a clean, SEO-friendly URL slug.
- Character CounterCount characters with and without spaces, bytes, and check common limits.
- Sort Lines AlphabeticallySort a list A–Z, Z–A, by number or length, or shuffle it; remove blanks and duplicates.
- Morse Code TranslatorTranslate text to Morse code and decode Morse back to text.
- Lorem Ipsum GeneratorGenerate lorem ipsum paragraphs, sentences or words as placeholder text.
- Text Diff CheckerCompare two texts and highlight additions and deletions by line, word or character.
- Markdown to HTML ConverterConvert Markdown to clean HTML with a live preview.
- Markdown Table GeneratorPaste spreadsheet or CSV data and get a Markdown table.
- Word Frequency CounterFind the most frequent words and phrases in any text.
- Typing Speed Test (WPM)Measure your typing speed in WPM and your accuracy.
Developer Tools
- Password GeneratorCreate strong random passwords with the browser’s secure random generator.
- JSON Formatter & ValidatorFormat, minify and validate JSON with clear error positions.
- JSON to CSV ConverterTurn a JSON array of objects into CSV for Excel or Google Sheets.
- Base64 Encode & DecodeEncode text to Base64 or decode Base64 back to text (UTF-8 safe).
- URL Encode & DecodePercent-encode or decode URLs and query-string values.
- JWT DecoderDecode a JSON Web Token locally and check its expiry.
- SHA-256 Hash GeneratorHash text or a file with SHA-256, SHA-1, SHA-384 or SHA-512.
- Binary, Decimal & Hex ConverterConvert numbers between binary, octal, decimal and hex; text to binary.
- Regex TesterTest JavaScript regular expressions with live match highlighting.
- Cron Expression GeneratorBuild a cron expression, read it in plain English and preview next runs.
- Unix Timestamp ConverterConvert Unix/epoch timestamps to dates and dates to timestamps.
- UUID GeneratorGenerate random version 4 UUIDs (GUIDs), one or hundreds at a time.
- HTML, CSS & JS Live PreviewWrite HTML, CSS and JavaScript and see the result live, sandboxed.
- Bulk URL Opener & Link ExtractorExtract every link from text or HTML and open them in batches.
Image & Design Tools
- Image CompressorShrink JPG, PNG and WebP images in your browser. No upload.
- Image ResizerResize images to exact pixels or social-media sizes, with crop-to-fill.
- Image Format ConverterConvert images between PNG, JPG and WebP in your browser.
- QR Code GeneratorMake a QR code for a link or text. Download as PNG or SVG.
- Color Converter (HEX, RGB, HSL)Convert colors between HEX, RGB, HSL and CMYK with a picker.
- Color Contrast CheckerCheck WCAG contrast ratio between text and background colors.
- Aspect Ratio CalculatorFind the aspect ratio of a size, or scale a size to keep the ratio.
- Color Palette ExtractorPull the main colors out of an image as a HEX palette.
- Signature MakerDraw or type your signature and download a transparent PNG.
- Meme Generator & Text on ImageAdd bold top and bottom captions to any picture.
- Favicon GeneratorCreate favicon.ico, PNG icons and a manifest from an image or text.
- Barcode GeneratorMake Code 128, EAN-13 and EAN-8 barcodes as PNG or SVG.
PDF & Document Tools
- Image to PDF ConverterTurn JPG, PNG and WebP images into one PDF, in any order.
- Merge PDFCombine several PDF files into one, in the order you choose.
- Split PDF & Extract PagesExtract page ranges or split a PDF into single pages or chunks.
- Compress PDFMake a PDF smaller, losslessly or by turning pages into images.
- PDF to JPG / PNG ConverterSave PDF pages as JPG or PNG images at the resolution you need.
- PDF Viewer & ReaderOpen and read PDF files in the browser, with zoom and page navigation.
- Text to PDF ConverterTurn plain text into a neat, paginated PDF document.
- Invoice GeneratorCreate a professional PDF invoice with tax, discount and totals.
- Resume / CV BuilderBuild a clean, ATS-friendly resume or CV and download it as PDF.
- Citation Generator (APA & MLA)Format APA 7 and MLA 9 citations for books, articles and websites.
Browser AI & Simulations
- Neural Network PlaygroundTrain a small neural network in your browser and watch it learn.
- Gesture Predictor (Teach the AI)Draw swipes and shapes; the AI learns from your examples and predicts live.
- Fly Brain Simulator (Toy Model)A tiny spiking-neuron "fly" learns to steer toward food by reward.
- Connect Four & Tic-Tac-Toe vs AIPlay Connect Four or Tic-Tac-Toe against a minimax AI.
- Hugging Face Trends DashboardLive trending, most downloaded and newest AI models and Spaces on Hugging Face.
No tools match your search. Try a shorter word, or browse the categories above.
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Why use browser-based tools?
Your input stays with you
The calculations and conversions run in JavaScript on your own device. Text, numbers, files and images you use with our tools are not uploaded to our servers. Third-party ads may set their own cookies; see the privacy policy.
Free, with no account
No sign-up, no download and no paywall. The site is supported by advertising, shown in separate areas of the page.
Small and fast
Plain HTML, CSS and a few kilobytes of JavaScript per tool, with no frameworks, so pages load quickly even on a slow phone connection. Every tool has a guide explaining the formula or method so you can check the result.
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