Free, fast, privacy-first online tools for developers. All processing happens in your browser — nothing is sent to a server.
Format, validate, and beautify JSON data with syntax highlighting.
Encode text or files to Base64, or decode Base64 back to text.
Generate UUID v4, v7, and other versions. Bulk generation supported.
Encode or decode URLs and query parameters.
Compare two texts side by side and highlight differences.
Test regular expressions against sample text with match highlighting.
Convert Unix timestamps to human-readable dates and vice versa.
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes.
Convert between JSON and CSV formats.
Generate placeholder text in various formats and lengths.