ToolNestFree Online Developer Tools
Format JSON, encode Base64 and URLs, decode JWTs, generate UUIDs, convert Markdown to HTML, translate text to binary, and convert number bases. Built for developers who want instant answers without opening a terminal — free, private, no signup.
JSON Formatter
Free JSON formatter, validator and minifier. Beautify, validate and minify JSON instantly in yo...
Base64 Encoder / Decoder
Free Base64 encoder and decoder online. Convert text to Base64 and decode Base64 back to text i...
UUID Generator
Generate free UUIDs online: v4 random and v7 time-ordered UUIDs, bulk generation up to 500, upp...
URL Encoder / Decoder
Free URL encoder/decoder: percent-encode URLs or decode %20-style strings back to readable text...
Color Converter
Free color converter: HEX to RGB, RGB to HEX, HSL values, live preview, and WCAG contrast ratio...
Markdown to HTML
Free Markdown to HTML converter: paste Markdown, get clean HTML plus a live preview. Supports h...
JWT Decoder
Free JWT decoder: paste a JSON Web Token to instantly read its header, payload claims, and expi...
Unix Timestamp Converter
Free Unix timestamp converter: convert epoch seconds/milliseconds to readable dates and back, w...
Text to Binary Converter
Free text to binary converter: translate text to binary code and binary back to text, UTF-8 saf...
Number Base Converter
Free number base converter: convert between binary, octal, decimal, and hexadecimal (bases 2–36...
HTML Encoder / Decoder
Free HTML encoder/decoder: convert < > & " ' to HTML entities (< > &) and decode enti...