TOOLS/ 35 UTILITIES⚡ runs locally

Developer Tools

All tools run locally in your browser: nothing leaves your machine.

Looking for the full developer surface? Visit the Developer Hub for cheatsheets, reference pages, and editorial coverage.

ALL TOOLS/ MOST USED FIRST

JSON FormatterFormat, validate & minify JSON Base64 Encode/DecodeEncode & decode Base64 strings UUID GeneratorGenerate v4 UUIDs instantly Timestamp ConverterConvert Unix timestamps ↔ dates JWT DecoderDecode & inspect JWT tokens Regex TesterTest regex patterns with live matching Diff CheckerCompare two texts & see every difference Cron BuilderBuild & decode cron expressions visually Hash GeneratorMD5, SHA-1, SHA-256, SHA-512 & HMAC Color ConverterHEX, RGB, HSL & contrast checker API TesterSend HTTP requests & inspect responses Markdown EditorWrite & preview Markdown live YAML ↔ JSONConvert & validate YAML and JSON Chmod CalculatorLinux file permission calculator Port ReferenceCommon TCP/UDP ports & services Password GeneratorStrong random passwords instantly QR Code GeneratorGenerate QR codes from text or URLs Lorem IpsumPlaceholder text with fun variants HTTP Status CodesSearch any status code for meaning & fixes URL Encode/DecodePercent-encode URLs & parse components HTML EntitiesEncode & decode HTML special characters Satoshi ConverterConvert sats ↔ BTC ↔ USD with live price Gwei CalculatorETH gas units & transaction cost estimator Hex ConverterHex, decimal, binary, octal, ASCII & color preview Slug GeneratorConvert text to URL-safe slugs (handles unicode, German) Case ConvertercamelCase ↔ snake_case ↔ kebab-case & 7 more Text StatsWord, char, line, sentence count + reading time Image to Base64Drop image, get data URI for HTML/CSS/Markdown HMAC GeneratorSHA-1/256/384/512 with secret key, hex & base64 Markdown TableVisual table builder, paste TSV/CSV, set alignment CSV ↔ JSONTwo-way converter, header-aware, quote-safe JSONPath TesterLive query JSON with $, ., [n], [*], .. expressions Curl to CodeConvert curl to fetch / Python requests / axios JSON to TypesGenerate TypeScript / Go / Pydantic / Rust types SSH Key GeneratorEd25519 or RSA, OpenSSH format, 100% local