Free tools that just work.
Calculators, converters, generators and more — fast, private, and free to use.
Calculators
Scientific Calculator
Trigonometry, logarithms, powers and roots.
Currency Converter
Live exchange rates for major world currencies.
Unit Converter
Length, weight, temperature, volume, area, speed, data and time.
UK Salary Calculator
Take-home pay after tax, NI, student loan and pension.
Percentage Calculator
Percentage of a number, what % one value is of another, and percentage change.
VAT Calculator
Add or remove UK VAT at any rate.
Tip Calculator
Work out the tip and split the bill between people.
Loan Repayment Calculator
Monthly payment, total repaid and total interest on a loan.
Networking
Network / CIDR Calculator
Subnet masks, host ranges, and subnet splitting.
HTTP Status Code Reference
Search every common HTTP status code with an explanation.
Port Number Reference
Common TCP/UDP ports and the services that use them.
MAC Address Formatter
Validate and reformat MAC addresses between notations.
Word Games
Word Unscrambler
Find every valid word hiding in a set of letters.
Word Builder
Build the highest-scoring words from your letter tiles.
Word Counter
Word count, character count, and reading time, live.
Case Converter
UPPERCASE, lowercase, Title Case, camelCase and more, all at once.
Palindrome Checker
Check if a word or phrase reads the same backwards.
Anagram Solver
Check whether two words or phrases are anagrams.
Generators
Random String Generator
Secure random passwords, tokens and UUIDs.
Lorem Ipsum Generator
Placeholder text by word, sentence or paragraph.
Color Converter
Convert between HEX, RGB and HSL, and generate a palette.
Slug Generator
Turn any text into a clean, URL-safe slug.
Placeholder Image Generator
Custom SVG placeholder images for mockups.
Developer Tools
JSON Formatter & Validator
Pretty-print, minify, and validate JSON with clear error locations.
Regex Tester
Test regular expressions with live match highlighting.
Diff Viewer
Compare two blocks of text line by line.
Base64 Encoder / Decoder
Encode or decode Base64, with a URL-safe option.
JWT Decoder
Decode a JWT header and payload — signature not verified.
Cron Expression Parser
Understand a cron schedule and see its next run times.
Hash Generator
SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
URL Encoder / Decoder
Percent-encode or decode text for URLs.
Unix Timestamp Converter
Convert between Unix timestamps and readable dates.
HTML Entity Encoder / Decoder
Escape or decode HTML entities.