Free Online Tools, Calculators & Developer Utilities

Calculate monthly repayments, total repayment and total interest for a loan.

Calculate payoff time, interest and the impact of extra credit card payments.

Calculate mortgage repayments, interest costs, fees, LTV ratios and amortization schedules instantly.

Calculate investment growth, compound interest and future savings value instantly.

Add VAT, remove VAT and calculate VAT-inclusive or VAT-exclusive prices instantly.

Calculate UK income tax, National Insurance, pension deductions and take-home pay instantly.

Calculate tips, split restaurant bills and work out per-person payments instantly.

Create professional PDF invoices instantly with VAT support, line items, totals and payment details. Generate invoices locally in your browser with no signup required.

Generate GUIDs instantly for development and testing.

Encode text to Base64 or decode Base64 strings instantly online.

Generate realistic fake CSV and JSON test data instantly using Faker and Bogus.

Generate strong random passwords with letters, numbers and symbols.

Convert text, binary, decimal, hexadecimal and octal numbers instantly.

Generate QR codes instantly for links, text, WiFi and more.

Convert CSV data into formatted JSON instantly online.

Convert JSON arrays into CSV instantly online.

Format, beautify and minify JSON instantly online.

Generate MD5, SHA256, SHA512 and other cryptographic hashes instantly.

Encode and decode URLs instantly online.

Decode JWT tokens, inspect payloads and validate token structure instantly.

Validate, format and beautify YAML configuration files online instantly.

Convert text to Unicode escape sequences and decode Unicode characters online.

Convert Unix timestamps into readable dates and convert dates back into epoch timestamps instantly online.

Format ISO 8601 dates into custom readable date and time formats instantly online.

Convert tabs to spaces or spaces to tabs, visualize hidden whitespace characters and inspect indentation formatting online.

View image metadata including camera details, timestamps and GPS data instantly.

Compress JPG and JPEG images instantly online.

Convert HEIC images from iPhone and Apple devices into PNG instantly.

Resize JPG, PNG and WebP images instantly online.

Convert JPG and JPEG images to PNG instantly online.

Convert JPG, PNG and WEBP images into high-quality PDF documents online instantly.

Remove EXIF, GPS and image metadata from JPG, PNG and WebP images online.

Convert PNG images to JPG and JPEG instantly online while reducing file size.

Flip, mirror and rotate JPG, PNG and WebP images instantly online.

Convert miles, kilometers, meters, feet, yards and more instantly.

Convert kilograms, pounds, ounces, stones, grams and tonnes.

Convert MPH, KM/H, meters per second and knots instantly.

Convert square meters, square feet, acres, hectares and more instantly.

Convert UTC, GMT, EST, PST and world time zones instantly.

Convert Celsius, Fahrenheit and Kelvin instantly.

Convert liters, milliliters, gallons, pints, cups and fluid ounces instantly online.

Convert seconds, minutes, hours, days, weeks, months and years instantly online.

Calculate percentages, increases, decreases and percentage differences instantly.

Calculate exact age in years, months and days instantly online.

Calculate running pace, finish time, MPH, KM/H and race splits.

Calculate your body mass index using metric or imperial measurements.

Count words, characters, sentences and paragraphs instantly.

Convert text to uppercase, lowercase, title case and sentence case.

Generate random placeholder paragraphs for websites, apps and mockups.

Generate realistic random names for testing and demos.

Generate UK National Insurance numbers for testing.

Generate random email addresses for testing, demos and development.