Free Developer Tools
Everyday utilities for developers, without pasting tokens, API responses or customer data into someone else's server. Every tool runs client-side, keeps working offline once loaded, and needs no account.
12 toolsJSON Formatter
Format, validate, and beautify JSON in an instant.
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes for text or files.
Base64 Tool
Encode or decode Base64 and URL strings instantly.
Regex Tester
Test regular expressions with live match highlighting.
UUID Generator
Generate random UUIDs and GUIDs instantly.
Cron Expression Parser
Parse a cron expression into a human-readable schedule and see its next upcoming run times, entirely in your browser.
JWT Decoder
Decode and inspect JSON Web Tokens entirely in your browser - header, payload, expiry, and an optional signature check, never uploaded anywhere.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back, with timezone support and a live-ticking clock - entirely in your browser.
URL Encoder & Parser
Encode or decode URLs and query strings, or parse a full URL into its parts and edit the query string in a live table - entirely in your browser.
HTML Entity Encoder / Decoder
Encode text to HTML entities or decode entities back to text, entirely in your browser.
CSV ↔ JSON Converter
Convert CSV to JSON and JSON to CSV - auto-detected delimiters, typed values, nested keys, and Excel-ready CSV - entirely in your browser.
Favicon Generator
favicon.ico, Apple and Android icons, web manifest and HTML from an image, text or emoji - with real-size previews.