DevTools Hub - Free Online Developer Tools

Developer Tools Collection

Essential tools for developers, programmers, and webmasters. All tools work directly in your browser with no server-side processing.

Format, validate, minify, and beautify JSON with syntax highlighting and error detection.

Encode and decode Base64 strings. Supports standard and URL-safe variants.

Convert between Unix timestamps and human-readable dates. Shows current time.

Encode and decode URLs for safe transmission. Handles special characters.

Generate MD5, SHA-1, SHA-256, and SHA-512 checksums instantly.

Create and validate cron expressions. See next execution times.

Generate UUID v1, v4, and v7 identifiers. Bulk generation supported.

Convert between HEX, RGB, and HSL color formats with live preview.

Test regular expressions with real-time matching and capture group display.

All processing happens in your browser. No data is sent to any server. Your code never leaves your device.

No signup, no limits, no premium tier. Every tool is completely free forever.