Base Converter
Convert integers between bases 2–36 with BigInt-exact results.
Use tool →Developer Tools 24
Encoders, formatters, hashes, ciphers and port checks. Every tool below is free, needs no sign-up, and runs entirely in your browser — your data never leaves your device.
Timestamp Converter
Unix seconds or milliseconds to date and back, with world clocks.
Use tool →Base64 Encoder / Decoder
UTF-8-safe Base64 both ways with a URL-safe alphabet option.
Use tool →URL Encoder / Decoder
Percent-encode or decode with component and whole-URI modes.
Use tool →Unicode Encoder / Decoder
Text to \uXXXX, U+ notation or HTML entities — and back.
Use tool →Text to ASCII Converter
Character ⇄ code table with decimal, hex and ASCII flags.
Use tool →Image to Base64
Images to data URLs with HTML/CSS snippets — never uploaded.
Use tool →Compare Text
Side-by-side line diff with LCS matching and color highlights.
Use tool →Markdown Editor
Live Markdown preview with GFM tables and one-click HTML copy.
Use tool →MD5 Hash Generator
Classic MD5 digests for checksums and legacy formats, RFC 1321 verified.
Use tool →SHA Hash Generator
SHA-1/256/384/512 digests via native WebCrypto, all at once.
Use tool →RIPEMD-160 Hash Generator
RIPEMD-160 digests with official test vectors — Bitcoin-ready.
Use tool →HMAC Signature Generator
Keyed HMAC-SHA256/512 signatures via WebCrypto, key stays local.
Use tool →AES Encrypt / Decrypt
Authenticated AES-GCM (128/256) via WebCrypto, random IV, key never stored.
Use tool →DES / TripleDES Encrypt
Legacy DES and 3DES (ECB + PKCS7) for old systems, clearly labeled obsolete.
Use tool →Rabbit Encrypt / Decrypt
RFC 4503 Rabbit stream cipher verified against all official vectors.
Use tool →RC4 Encrypt / Decrypt
Classic RC4 for legacy protocols, verified vectors, honestly labeled insecure.
Use tool →HTML Formatter
Re-indent messy HTML with pre/textarea/script left untouched.
Use tool →CSS Formatter
Re-indent CSS with comments preserved and @media nested.
Use tool →JavaScript Formatter
Prettier-powered JS beautifier with semicolon and quote options.
Use tool →JavaScript Obfuscator
Light client-side obfuscation — string escaping and renaming.
Use tool →Local Port Checker
Check which common ports are reachable on your own machine.
Use tool →CSV ⇄ JSON Converter
RFC 4180-safe CSV to JSON and back, with delimiter and header options.
Use tool →JSON Formatter & Validator
Pretty-print or minify JSON with exact line-and-column error reporting.
Use tool →Browse other categories 7
Health
BMI, calories, heart rate and body calculators
Browse category →Life
Age, loans, sizes and everyday lookups
Browse category →Generators
QR codes, barcodes, passwords and random data
Browse category →Converters & Math
Units, geometry and number converters
Browse category →Text & Office
Case converters, symbols and text utilities
Browse category →Image
Resize, compress, crop and convert — all local
Browse category →Just for Fun
Lucky wheels, pickers and novelty tools
Browse category →