JSON Formatter
Format, minify, and validate JSON with readable errors.
Developer ToolsThe toolkit
Developer Tools
Format, encode, hash, and debug without a server.
A tool for the task
Not sure where to start? Read a guide Developer Tools
11 toolsBuilt to be useful. Free to use.
Base64 Encoder & Decoder
Encode Unicode text as Base64 or decode it back to text.
Developer ToolsURL Encoder & Decoder
Encode a query parameter or decode percent-escaped text.
Developer ToolsUUID Generator
Generate version 4 UUIDs using your browser’s cryptographic random source.
Developer ToolsSHA-256 Hash Generator
Calculate a SHA-256 digest for UTF-8 text locally.
Developer ToolsUnix Timestamp Converter
Convert Unix seconds or milliseconds into UTC dates and back.
Developer ToolsCSV to JSON Converter
Convert comma-separated records into a structured JSON array.
Developer ToolsJSON to CSV Converter
Turn an array of JSON objects into a downloadable CSV file.
Developer ToolsHTML Entity Encoder & Decoder
Escape HTML-sensitive text and decode common or numeric entities.
Developer ToolsHEX / RGB / HSL Color Converter
Convert a solid HEX or RGB color into HEX, RGB, and HSL values.
Developer ToolsColor Contrast Checker
Check foreground/background contrast against WCAG 2.x AA and AAA thresholds.
Developer Tools