Developer Tools
Everyday utilities for developers — JSON, HTML, CSS, SQL and code formatters, encoders, validators and converters, all free and running in your browser.
JSON
エンコーディング
Base64 Encoder/Decoder
Encode or decode text and files using Base64.
URL Encode
Percent-encode text for safe use in a URL.
URL Decode
Decode a percent-encoded URL back to readable text.
HTML Encode
Convert special characters into HTML entities.
HTML Decode
Convert HTML entities back to readable characters.
JWT Decoder
Decode and inspect JSON Web Tokens.
開発者
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Cron Expression Generator
Build a cron expression with a plain-English description.
Regex Tester
Test a regular expression against sample text with matches highlighted.
Regex Generator
Pick a common regex pattern and test it against your own text.
Color Picker & Converter
Pick a color and convert between HEX, RGB and HSL.
Web
HTML Formatter
Format and indent messy HTML markup.
CSS Formatter
Format and indent messy CSS.
JavaScript Formatter
Format and indent messy or minified JavaScript.
SQL Formatter
Format and indent messy SQL queries.
XML Formatter
Format and indent messy XML documents.
YAML Formatter
Format and normalize the indentation of a YAML document.
Markdown Formatter
Normalize spacing and formatting in a Markdown document.