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Free calculators, converters and developer tools — instant and private.
Most popular
The tools people use most this month.
JSON Formatter & Validator
Format, beautify, minify and validate JSON with syntax highlighting, key sorting and precise error locations.
Percentage Calculator
Three calculators in one: find X% of a number, what percent one number is of another, and the percentage change between two values.
Word Counter
Count words, characters, sentences and paragraphs, with reading time, speaking time, readability and keyword density.
Excel to CSV Converter
Convert Excel spreadsheets (XLSX, XLS, ODS) to CSV with a comma, semicolon or tab separator. Pick the sheet, preview and download.
Image to PDF Converter
Combine JPG, PNG and WebP images into one PDF, one image per page. Reorder pages and choose A4, Letter or the image size.
Length Converter
Convert between metres, kilometres, centimetres, millimetres, miles, yards, feet, inches and nautical miles.
Age Calculator
Your exact age in years, months and days — plus total days, weeks, hours and a countdown to your next birthday.
Meta Tag Generator
Meta tag generator for SEO: build the title, description, canonical, robots, Open Graph and Twitter Card tags with a live search preview.
Calculators & Finance
15 tools
Percentage Calculator
Three calculators in one: find X% of a number, what percent one number is of another, and the percentage change between two values.
Percentage Increase Calculator
Increase a number by a percentage, or find the percentage increase between an original and a new value.
Percentage Decrease Calculator
Reduce a number by a percentage, or find the percentage decrease from an original value to a lower one.
Discount Calculator
See the sale price and how much you save, including stacked "extra % off" discounts.
Markup Calculator
Set a selling price from cost and markup, or work out the markup and margin of an existing price.
Profit Margin Calculator
Calculate gross profit, margin and markup from cost and revenue — or the price needed for a target margin.
Simple Interest Calculator
Calculate simple interest and the total amount for any principal, rate and period in years, months or days.
Compound Interest Calculator
Project savings growth with compound interest, compounding frequency and regular contributions.
Mortgage & Loan Amortization Calculator
Monthly payment, total interest and a full amortization schedule — with extra-payment savings and CSV export.
Tip Calculator
Work out the tip, total bill and each person's share when splitting the bill.
Sales Tax Calculator
Add sales tax or VAT to a net price, remove it from a gross price, or find the tax rate used.
Break-Even Calculator
Find how many units you must sell to cover fixed costs, plus break-even revenue and contribution margin.
Average Calculator
Mean, median, mode, range, standard deviation and quartiles for any list of numbers.
Ratio Calculator
Solve proportions A : B = C : X and simplify ratios to their lowest terms.
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, with simplified answers and steps.
Health & Fitness
5 tools
BMI Calculator
Body Mass Index in metric or imperial units, with WHO category, healthy weight range and a visual gauge.
BMR Calculator
Use this BMR calculator to estimate your Basal Metabolic Rate, the calories your body burns at rest, with Harris-Benedict and Mifflin-St Jeor.
TDEE & Calorie Deficit Calculator
Estimate total daily energy expenditure and the calorie targets to lose, maintain or gain weight.
Ideal Body Weight Calculator
Ideal body weight from your height using the Devine formula, compared with Robinson, Miller and Hamwi.
Water Intake Calculator
Use this water intake calculator to estimate how much water to drink each day from your weight, exercise and climate.
Date & Time
7 tools
Age Calculator
Your exact age in years, months and days — plus total days, weeks, hours and a countdown to your next birthday.
Date Difference Calculator
Date difference calculator for the days, weeks, months and business days between two dates.
Add or Subtract Days Calculator
Add or subtract years, months, weeks and days (or business days) from any date.
Unix Timestamp to Date Converter
Convert Unix epoch timestamps (seconds, milliseconds or microseconds) to human-readable dates in UTC and local time.
Date to Unix Timestamp Converter
Convert a calendar date and time to a Unix timestamp in seconds and milliseconds, in local time or UTC.
Time Duration Calculator
Hours and minutes between two times (overnight shifts included) and add or subtract HH:MM durations.
Leap Year Checker
Check whether any year is a leap year using the Gregorian rules, with the number of days in the year and in February.
Text Tools
12 tools
Word Counter
Count words, characters, sentences and paragraphs, with reading time, speaking time, readability and keyword density.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case and more.
Remove Duplicate Lines
Remove duplicate lines from a list while keeping the original order, with case-insensitive and trimming options.
Remove Extra Spaces & Line Breaks
Remove extra spaces, tabs, blank lines and line breaks, and strip invisible characters from copied text.
Reverse Text
Reverse text by characters, word order, line order, or flip each word in place.
Sort Text Lines
Sort text lines alphabetically A–Z or Z–A, naturally, numerically, by length or randomly, with optional de-duplication.
Find and Replace
Find and replace text with case-sensitive, whole-word and regular-expression options, and see the number of replacements.
Text Repeater
Use this text repeater to repeat any word, phrase or emoji up to 10,000 times with your choice of separator.
URL Slug Generator
Turn titles into clean, SEO-friendly URL slugs — accents removed, special characters stripped.
Text to ASCII Converter
Convert text to ASCII / Unicode character codes in decimal, hexadecimal, binary or octal.
ASCII to Text Converter
Decode ASCII / Unicode codes in decimal, hex, binary or octal back into readable text, with auto-detection.
Typing Speed Test
Test your typing speed in words per minute and accuracy, get a rating and personal tips to type faster.
Developer Tools
13 tools
JSON Formatter & Validator
Format, beautify, minify and validate JSON with syntax highlighting, key sorting and precise error locations.
Base64 Encoder
Encode text to Base64 (UTF-8 safe), with URL-safe and MIME line-wrapping options.
Base64 Decoder
Decode Base64 and URL-safe Base64 back to UTF-8 text, with clear errors for invalid input.
URL Encoder / Decoder
Percent-encode or decode URLs and query parameters, as a component or a full URI.
HTML Entity Encoder / Decoder
HTML entity encoder and decoder: escape special characters to entities, or decode named and numeric entities back to text.
Regex Tester
Regex tester for JavaScript regular expressions: live match highlighting, capture groups and replace preview.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, and verify checksums.
Bcrypt Hash Generator
Bcrypt hash generator for Laravel and PHP: create $2y$ password hashes with the cost factor you choose, and check a password against a hash.
UUID Generator
Generate cryptographically random version 4 UUIDs in bulk, with formatting options and a UUID validator.
Password Generator
Create strong random passwords with custom length and character sets, plus entropy and crack-time estimates.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text as paragraphs, sentences, words or list items — in plain text or HTML.
Color Code Converter
Color converter: convert colors between HEX, RGB, HSL and CMYK with a live swatch, WCAG contrast check and tint/shade palette.
QR Code Generator
Create QR codes for URLs, text, Wi-Fi, email, SMS and phone numbers — custom colours, instant PNG and SVG download.
SEO Tools
8 tools
Meta Tag Generator
Meta tag generator for SEO: build the title, description, canonical, robots, Open Graph and Twitter Card tags with a live search preview.
SERP Snippet Preview Tool
SERP snippet preview: see how your title tag and meta description may look in Google on desktop and mobile, with live character and pixel counts.
Robots.txt Generator
Robots.txt generator: allow or block crawlers, add your sitemap, start from a WordPress preset and block AI bots, then copy or download the file.
XML Sitemap Generator
XML sitemap generator: paste your page URLs and download a valid sitemap.xml, with duplicates removed and invalid URLs flagged.
UTM Link Builder
UTM link builder: create campaign URLs with utm_source, utm_medium and utm_campaign, keep your existing query string and avoid messy tracking data.
FAQ Schema Generator
FAQ schema generator: turn questions and answers into valid FAQPage JSON-LD to paste into your page, with a clear note on what Google shows today.
Keyword Density Checker
Keyword density checker: paste text to see your most-used words and two- or three-word phrases with counts and percentages.
Htaccess Redirect Generator
Htaccess redirect generator: create 301 redirects, force HTTPS, set www or non-www and fix trailing slashes for Apache .htaccess and Nginx.
Unit Converters
11 tools
Length Converter
Convert between metres, kilometres, centimetres, millimetres, miles, yards, feet, inches and nautical miles.
Weight Converter
Convert mass between kilograms, grams, milligrams, tonnes, pounds, ounces, stones and US/UK tons.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine — with absolute-zero validation.
Area Converter
Convert square metres, square feet, acres, hectares, square miles, square kilometres and more.
Volume Converter
Convert litres, millilitres, cubic metres, US and UK gallons, quarts, pints, cups, fluid ounces and spoons.
Speed Converter
Convert km/h, mph, m/s, knots, ft/s and Mach.
Data Storage Converter
Data storage converter: convert bits and bytes to KB, MB, GB, TB and PB in decimal (SI) and binary (KiB, MiB, GiB) units.
Pressure Converter
Convert pascals, kilopascals, bar, millibar, psi, atmospheres, mmHg (torr) and inHg.
Energy Converter
Convert joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, electronvolts and therms.
Power Converter
Convert watts, kilowatts, megawatts, horsepower (mechanical and metric), BTU/h and kcal/h.
Time Unit Converter
Convert nanoseconds to centuries — seconds, minutes, hours, days, weeks, months and years.
Data Tools
7 tools
Excel to CSV Converter
Convert Excel spreadsheets (XLSX, XLS, ODS) to CSV with a comma, semicolon or tab separator. Pick the sheet, preview and download.
CSV to Excel Converter
Convert CSV to an Excel XLSX file. The separator is detected automatically, numbers stay numbers and leading zeros are kept.
Excel to JSON Converter
Convert an Excel sheet to JSON: an array of objects keyed by the header row, or an array of rows. Numbers and dates keep their types.
JSON to Excel Converter
Convert JSON to Excel or CSV: arrays of objects become rows and columns, nested fields are flattened into dot-named columns.
Excel to HTML Table Converter
Convert an Excel sheet into clean HTML table code with a header row, ready to paste into a website, email or CMS.
CSV Delimiter Converter
Change the separator of a CSV file: comma to semicolon, semicolon to comma, or to tab and pipe, with correct quoting.
CSV Column Filter & Duplicate Remover
Keep only the CSV columns you need and remove duplicate and empty rows, with case-insensitive matching.
Image Tools
17 tools
Image to PDF Converter
Combine JPG, PNG and WebP images into one PDF, one image per page. Reorder pages and choose A4, Letter or the image size.
JPG to PDF Converter
Convert JPG photos to PDF: one or many JPG images into a single PDF, in the order you choose. Free, no upload.
PNG to PDF Converter
Convert PNG images and screenshots to PDF without quality loss, one or many pages in one file. Free, no upload.
PNG to JPG Converter
Convert PNG images to JPG with adjustable quality and a background colour for transparent areas. Batch conversion, no upload.
JPG to PNG Converter
Convert JPG (JPEG) images to lossless PNG in your browser. Batch conversion, no quality loss from re-saving, no upload.
WebP to PNG Converter
Convert WebP images to PNG, keeping transparency. Open WebP pictures in any program. Batch conversion, no upload.
WebP to JPG Converter
Convert WebP images to JPG with adjustable quality, so they open in every app. Batch conversion, no upload.
SVG to PNG Converter
Convert SVG vector graphics to PNG images at 1×, 2×, 4× or an exact width, with transparency kept. No upload.
Image Resizer & Cropper
Resize images to exact pixels or a percentage and crop them freely or to 1:1, 4:3, 16:9 and more. JPG, PNG and WebP.
Image Compressor
Compress JPG, PNG and WebP images by up to 90%. PNG transparency is kept. Adjustable quality, optional resizing, no upload.
Compress Image to 20KB
Compress JPG, PNG or WebP images to under 20KB automatically, keeping the best quality that fits. Ideal for signatures and small photos on application forms.
Compress Image to 50KB
Compress JPG, PNG or WebP images to under 50KB automatically, keeping the best quality that fits. Ideal for photos on exam, job and ID applications.
Compress Image to 100KB
Compress JPG, PNG or WebP images to under 100KB automatically, keeping the best quality that fits. Ideal for documents, applications and profile photos.
Compress Image to 200KB
Compress JPG, PNG or WebP images to under 200KB automatically, keeping the best quality that fits. Ideal for email, websites and online listings.
Image to Base64 Converter
Convert an image to a Base64 data URI, plain Base64, a CSS background or an HTML img tag, ready to copy.
Base64 to Image Converter
Decode a Base64 string or data URI back into an image: preview it and download it as PNG, JPG, GIF, WebP or SVG.
Color Palette Extractor
Extract the main colours from any image as HEX and RGB codes with their share, and copy them as CSS variables or JSON.
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