Free tools — fast, private, no sign-up

Calculators, converters and utilities that run right in your browser. No accounts, no limits, and your data never leaves your device.

Categories

Free financial calculators: compound interest, loans, mortgages, net salary and more.

Unit and measurement converters: length, weight, temperature, currency and more.

Text, PDF & Image

Text, PDF and image tools that run in your browser: your files never leave your device.

Developer tools: JSON, Base64, hashes, UUID, regular expressions and more.

Date and time calculators: exact age, days between dates, countdowns and more.

Health and wellness calculators using reference formulas: BMI, calories and more. Informational — not medical advice.

Calculators for students: grades, weighted average, final exam grade needed and more.

All tools

Percentage calculator Find X% of any number, see what percent one value is of another and get the percentage change between two amounts in real time. Free, no sign-up. Celsius to Fahrenheit converter Convert Celsius to Fahrenheit (and °F to °C) instantly, with the exact formula, a temperature table and fever and oven examples. Free, no sign-up. CM to inches converter Convert centimeters to inches (and inches to cm) instantly, with the exact formula, a conversion table and feet-and-inches output. Free, no sign-up. KG to lbs converter Convert kilograms to pounds (and pounds to kg) instantly with the exact factor, a handy conversion table and stones output. Free, no sign-up. Miles to KM converter Convert miles to kilometers and km to miles instantly with the exact 1.609344 factor, race distance table and mph to km/h guide. Free, no sign-up. Rule of three calculator Solve direct and inverse rule of three problems instantly: enter three values and get the unknown X, with the formula and worked examples. Free, no sign-up. Final grade calculator Find out exactly what score you need on your final exam to pass or hit your goal grade: enter your current grade and the exam weight. Free and instant. Weighted average calculator Compute your weighted average using weights or credits: add grade-and-weight rows and see the result and total weight update live. Free, no sign-up. Age calculator Work out exact age in years, months and days from a date of birth, plus total weeks, total days and the countdown to the next birthday. Free, no sign-up. Hours calculator Count hours and minutes between a start and an end time, subtract lunch breaks and get payroll-ready decimal hours. Overnight shifts handled automatically. Days between dates Count the exact days between two dates, with weeks, months, years and Monday-to-Friday business days. Perfect for deadlines. Free, no sign-up. Mortgage calculator Estimate your monthly mortgage payment from home price, down payment, rate and term, plus amount financed, total paid and total interest. Free, no sign-up. Loan calculator Work out your loan’s fixed monthly payment with French amortization: total paid, total interest and a year-by-year table. Free, in your browser. Tip calculator Work out the tip and grand total, split the bill among friends and round each share up. Quick 10 to 25% buttons included. Free and no sign-up needed. Compound interest calculator See how your money grows with compound interest: monthly contributions, monthly or yearly compounding and a year-by-year breakdown. Free, no sign-up. Dominican Republic severance calculator Estimate Dominican Republic severance: notice pay, seniority pay, unused vacation and Christmas salary under the Labor Code, itemized in seconds. Dominican Republic net salary calculator Find your take-home pay in the Dominican Republic: AFP, SFS and income tax deductions using the current DGII brackets and TSS caps. Free, no sign-up. Base64 encode / decode Encode and decode Base64 with full UTF-8 support — accents and emojis handled correctly. Paste text, copy the result instantly. Free, no sign-up. Diff checker — compare text Compare two texts line by line: additions in green, deletions in red, plus change counters. Runs 100% in your browser, so private text never leaves your device. Unix timestamp converter Convert Unix timestamps to readable dates in local time and UTC, or any date to seconds and milliseconds. Auto-detects the unit, right in your browser. JSON formatter & validator Format, validate and minify JSON right in your browser: 2 or 4 space indentation and syntax errors with exact line and column. Free, no sign-up. Password generator Generate strong random passwords in your browser with cryptographic randomness: length slider, symbols and an entropy strength meter. Free, no sign-up. Hash generator (MD5, SHA-256) Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text instantly in your browser, with one-click copy for every result. Free and no sign-up needed. QR code generator Create QR codes for URLs, WiFi or text with custom colors, size and error correction. Generated in your browser and downloadable as PNG or SVG. UUID generator Generate up to 100 random UUID v4 identifiers in your browser, in lowercase or uppercase, and copy one or all with a single click. Free, no sign-up. Regex tester Test regular expressions live: highlighted matches, capture groups and JavaScript flags. Runs fully in your browser, free, private and with no sign-up. Color picker (HEX, RGB, HSL) Convert colors between HEX, RGB and HSL in real time, with a tint and shade palette, complementary color and one-click copy for every value. Free, no sign-up. Pregnancy calculator Estimate your due date with the Naegele rule, plus current weeks and days of pregnancy, your trimester and how many days are left. Free and private. BMI calculator Work out your BMI from weight and height (kg/cm or lb/ft), see your WHO category and the healthy weight range for your height. Free, no sign-up. TDEE calculator Estimate your TDEE and basal metabolic rate with the Mifflin-St Jeor formula, plus daily calories to maintain, lose or gain weight. Free tool. Image compressor Compress JPG, PNG and WebP images in your browser: adjust quality, see the savings instantly and download files one by one or as a ZIP. Nothing is uploaded. Character counter Live character count with limit bars for X/Twitter, Instagram, SMS, meta descriptions and SEO titles, so you always know how many characters remain. Word and character counter Count words, characters, sentences and paragraphs live as you type, with estimated reading time. Your text never leaves your browser. Case converter Convert text to UPPERCASE, lowercase, Title Case, Sentence case, alternating or inverted case in real time. One-click copy, free, private and no sign-up. Split PDF Split a PDF right in your browser: extract a page range or separate every page into its own file inside a ZIP. Free, private, nothing gets uploaded. Lorem Ipsum generator Generate Lorem Ipsum filler text in your browser: choose paragraphs, sentences or words (1-50), with or without the classic opening, and copy it in one click. JPG to PDF converter Merge several JPG, PNG or WebP images into one PDF right in your browser: reorder pages, pick the page size and download. Free — nothing gets uploaded. MP4 to MP3 converter Pull the audio out of your own MP4, M4A or WebM videos and save it as MP3 (128/192/320 kbps). It all runs in your browser — your file is never uploaded. PDF to JPG converter Convert every page of a PDF into JPG images right in your browser: pick the quality and download one photo or a ZIP. Free, files never leave your device. Image resizer Resize images to exact pixel dimensions right in your browser: social media presets, aspect-ratio lock and instant download. Free, private, no sign-up. Merge PDF Combine multiple PDFs into a single file right in your browser: drag, reorder and download. Your documents are never uploaded to any server. WebP to JPG converter Convert WebP images to JPG for free without uploading anything: drop your files, they convert inside your browser and download one by one or as a ZIP.