Developer Tools

15 free online developer tools. No signup, no installation, works in your browser.

• JSON Formatter - Format, validate, and beautify JSON data with syntax highlighting.
• Base64 Encoder/Decoder - Encode and decode Base64 strings quickly and securely.
• URL Encoder/Decoder - Encode and decode URLs for safe transmission over the internet.
• API Testing Tool - Test REST APIs like Postman. Send HTTP requests, inspect responses, and debug APIs with support for all methods.
• UUID Generator - Generate unique identifiers (UUIDs) in various formats including v1, v4, and v5.
• Regex Tester - Test regular expressions in real-time with match highlighting and explanation.
• HTML Entity Encoder - Convert special characters to HTML entities and decode them back.
• Timestamp Converter - Convert Unix timestamps to human-readable dates and vice versa.
• User-Agent Parser - Decode browser information from user-agent strings including OS and device.
• HTTP Status Code Lookup - Look up HTTP status codes and get detailed explanations and usage.
• Cron Expression Generator - Visual cron schedule builder with expression validation and explanation.
• HTML Tag Remover - Strip HTML tags from text while preserving content structure.
• CSS Minifier - Compress CSS code to reduce file size and improve loading speed.
• HTML Minifier - Compress HTML markup while preserving functionality and structure.
• Markdown Previewer - Preview and edit Markdown with live rendering and syntax highlighting.