Developer Tools, In Your Browser

Format, validate, and beautify JSON with syntax highlighting and tree view.

Encode and decode Base64 strings and files with drag-and-drop support.

Decode JSON Web Tokens to inspect header, payload, and verify signatures.

Build and validate cron expressions with a visual editor and next run times.

Test regular expressions with real-time match highlighting and capture groups.

Generate, validate, and inspect UUIDs in v4 and v7 formats.

Convert between Unix timestamps and human-readable dates with timezone support.

Encode and decode URLs, parse query parameters, and build query strings.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files.

Convert colors between HEX, RGB, HSL formats with contrast checker and palette generator.

Compare two texts side by side with line-by-line and character-level diff highlighting.

Convert between symbolic (rwx) and numeric (octal) Unix file permissions interactively.

Encode and decode HTML entities, named characters, and Unicode escape sequences.

Convert between JSON and YAML formats instantly with syntax validation.

Browse, search, and learn about all HTTP status codes with detailed explanations.