Developer Tools
JSON formatter, JWT decoder, HTML editor, CSV ↔ JSON, diff, Markdown.
- HTML Editor (WYSIWYG)
Browser-based WYSIWYG HTML editor with formatting toolbar and live HTML source view. Paste rich text, edit, copy clean HTML.
- JSON Formatter / Validator
Format, minify, and validate JSON instantly. 2/4-space or tab indent. Shows precise error location. Runs in your browser.
- Markdown to HTML
Convert Markdown to clean HTML with live preview. Supports headings, lists, links, code blocks, blockquotes, emphasis.
- Text Diff / Compare
Compare two blocks of text line by line. See added, deleted, and unchanged lines highlighted. Browser-based.
- JWT Decoder
Decode JSON Web Tokens (JWT) in your browser. View header, payload, and expiry. Signature shown but not verified.
- CSV ↔ JSON
Convert CSV to JSON (array of objects) or JSON to CSV. Custom delimiter, header detection, quoted fields supported.
- Regex Tester
Test JavaScript regular expressions live — highlights matches in your text and lists captured groups. All flags supported.
- Color Converter
Convert between HEX, RGB, HSL, and RGBA color formats. Live color picker, all formats stay in sync. Browser-based.
- Number Base Converter
Convert numbers between decimal, hex, binary, octal, and any base 2-36. All four common bases stay in sync.
- JSON Diff
Compare two JSON values structurally. Shows added, removed, and changed keys with full paths. Browser-based.
- Cron Expression Builder
Build cron expressions with a 5-field editor. See plain-English description and the next 5 fire times in your local timezone.
- Meta Tag Generator
Generate SEO meta tags + Open Graph + Twitter Card tags for any page. Live SERP preview. Browser-based.