Web Developer Tools

Free online tools for web developers — URL encoding, HTML entities, JWT, basic auth, HTTP status codes, user-agent parsing, and more.

Web Developer Tools

• Encode/decode URL-formatted strings — Encode text to URL-encoded format (percent-encoding) or decode it back. Supports
• HTML Entity Encoder & Decoder — Escape or unescape HTML entities — replace characters like <, >, &, " and ' with
• URL Parser & Inspector — Parse a URL into its separate constituent parts (protocol, origin, params, port,
• Device Information & Browser Detector — Detect detailed information about your current device and browser: screen resolu
• Basic auth generator — Generate HTTP Basic Authentication headers instantly. Enter a username and passw
• Open Graph / OG Meta Tag Generator — Generate Open Graph and Twitter Card meta tags for your website. Preview how you
• OTP code generator — Generate and validate time-based OTP (TOTP) and HMAC-based OTP (HOTP) for multi-
• MIME Types Reference & Lookup — Look up MIME types by file extension or convert extensions to MIME types. Covers
• JWT Token Decoder & Parser — Decode and inspect JWT tokens instantly. Extracts and displays the Header, Paylo
• Keycode info — Identify JavaScript keyboard event properties for any key press. Shows keyCode,
• Slugify string — Convert any string into a URL-safe slug, filename, or ID. Removes special charac
• HTML WYSIWYG Editor — Online rich text editor with live HTML preview. Format content visually using to
• User-agent parser — Detect and parse Browser, Engine, OS, CPU, and Device type/model from a user-age
• HTTP Status Codes Reference — Complete reference for all HTTP status codes (1xx–5xx) with names, descriptions,
• JSON diff — Compare two JSON objects and highlight their differences visually. Identifies ad
• Outlook SafeLink Decoder — Decode Microsoft Outlook SafeLink protected URLs and restore the original destin

Web Developer Tools Guides

• URL Encoding Explained: Why Special Characters Must Be Escaped
• URL Encoding Explained: Why Special Characters Must Be Escaped
• URL Encoding vs Base64 vs Hex: When to Use Which
• URL Encoding Explained: When, Why, and How to Encode URLs Correctly
• HTML Entities: Encode Special Characters for Safe Web Display
• HTML Entities Cheat Sheet: Common Named and Numeric References
• URL Structure Explained: Parse and Understand Any URL
• REST API Design Best Practices: URL Structure, Versioning, and Error Handling
• Device Information: What Your Browser Reveals About You
• HTTP Basic Authentication: How It Works and How to Generate Headers
• The HTTP Authorization Header Explained: Basic, Bearer, Digest, and API Keys
• How to Send Basic Auth in curl, Postman, fetch, and Python