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Developer Tools - Free Online Tools | FunToolX

Free online Developer Tools tools collection. Explore multiple fun Developer Tools tools, no registration required, instant access.

Developer Tools

Common developer tools

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Regex Tester
Test regular expressions online with match highlighting
HTML Encode/Decode
HTML entity encode and decode tool
Cron Parser
Parse cron expressions to human-readable description
HTTP Status Codes
HTTP status code quick reference with categories and details
Code Formatter
Format and beautify CSS/JS/SQL/XML code
Hash Generator
MD5/SHA-1/SHA-256/SHA-512 hash calculator
CSS Shadow Generator
Visually tune parameters and generate box-shadow CSS.
Border Radius Generator
Adjust four-corner rounding and generate border-radius CSS.
SVG Path Simplifier
Simplify SVG path points by tolerance to reduce size.
CSS Animation Generator
Configure keyframes and generate @keyframes animation CSS.
Barcode Generator
Generate Code128, EAN-13, UPC-A barcodes.
Subtitle Editor
Edit SRT/VTT subtitles with timeline shift and validation.
API Tester
Send GET/POST/PUT/DELETE requests right in your browser.
Text Encryptor
Encrypt and decrypt text with AES-GCM or RSA-OAEP, all locally.
DNS Lookup
Look up DNS records for any domain via Cloudflare public DNS — A, AAAA, CNAME, MX, TXT and more.
JWT Decoder
Decode the header and payload of a JWT token locally — inspect expiry and claims without sending data anywhere.
QR Code Decoder
Decode QR codes from an image or your camera and copy the result with one click.
Diagram Maker
Write Mermaid syntax and render flowcharts, sequence diagrams, UML, ER, topology and swimlane diagrams live.
Data Formatter
Format and validate YAML and XML, and convert between them and JSON — all in your browser.
Regex Visualizer
Turn a regular expression into a match diagram — an intuitive way to learn and debug complex regex.