๐ป Developer Tools
JSON, Base64, URL encoding, UUID, timestamps, JWT and regex. Everything runs in your browser and nothing is uploaded.
0111 tools
JSON Formatter
Free online JSON formatter: pretty print JSON with 2-space, 4-space or tab indentation, or minify it to a single line. Runs entirely in your browser.
โBase64 Encode / Decode
Decode Base64 to text or encode text to Base64 instantly. Handles UTF-8 (accents, emoji) and URL-safe Base64URL, with or without padding. Runs in-browser.
โ/.*/ Regex Tester
Test regular expressions as you type: live match highlighting, capture and named groups, replace preview and a clickable cheat sheet. JavaScript flavor.
โColor Converter
Convert HEX to RGB and HSL and back, generate a 50โ950 shade palette, and check WCAG AA/AAA contrast ratios. A free color converter for designers and devs.
โJWT Decoder
Paste a JSON Web Token to decode its header and payload and read exp, iat and nbf as local and UTC times. Your token never leaves the browser.
โUnix Timestamp Converter
Convert Unix epoch timestamps to readable dates in your local time and UTC, or a date to epoch. Auto-detects seconds, milliseconds, ฮผs and ns.
โJSON Validator
Validate JSON as you type and pinpoint syntax errors by line and column, with plain-English hints for trailing commas, quotes and comments, plus auto-fix.
โURL Encoder / Decoder
URL encode or decode text and links online. Choose encodeURIComponent or encodeURI, handle + for spaces, and see query parameters decoded in a table.
โUUID Generator
Generate random UUID v4 or time-ordered UUID v7 in bulk, up to 1,000 at once. Uppercase, no-hyphen, GUID braces, JSON or SQL output, plus a UUID inspector.
โPassword Generator
Generate strong random passwords (8โ64 chars) or memorable passphrases. Pick character sets, skip look-alikes like 0/O, and see entropy and crack time.
โNumber Base Converter
Convert binary, octal, decimal, hex and any base 2โ36 instantly. BigInt precision, two's complement for 8โ64-bit, clickable bits and 0x/0b prefixes.
โTools for everyday development
Format and validate JSON from API responses, decode JWTs, fix encoding issues with Base64 and URL encoders, read log times with the timestamp converter and test patterns with the regex tester. UUID and color code tools are here too.
Security
Everything runs in your browser and nothing is transmitted. Still, make it a habit never to paste production secrets or real user tokens into any online tool.