UUID Generator
Generate v4 and v7 UUIDs
What is UUID Generator?
UUID Generator creates universally unique identifiers (UUIDs) — 128-bit values formatted as 32 hexadecimal characters separated by hyphens. UUID v4 uses cryptographically secure randomness, while v7 includes a timestamp prefix for sortable IDs.
When to use this tool
- Generating unique database record IDs
- Creating unique session or transaction identifiers
- Assigning unique keys in distributed systems
- Producing collision-free IDs for API resources
How it works
UUID v4 generates 16 random bytes using the Web Crypto API and sets the version (4) and variant bits according to RFC 4122. UUID v7 prepends a 48-bit Unix timestamp in milliseconds followed by random bytes, ensuring both uniqueness and chronological sort order.
Security Guidelines
- Use v4 or v7 for general-purpose unique IDs
- Do not expose UUIDs that contain sensitive sequential data in public URLs
- v7 is preferred for database primary keys because it indexes efficiently
- UUIDs are not secret — do not use them as authentication tokens
Examples
About UUID Generator
Generate v4 and v7 UUIDs It runs entirely in your browser — no files are uploaded to any server, ensuring complete privacy and instant results.
- •Generate strong random passwords
- •Create UUIDs v4 and v7
- •Encrypt and decrypt with AES-256
- •Check password strength and entropy
Last updated: 2025-01-15
FAQ
Generate v4 and v7 UUIDs
Yes, completely free. No signup required.
Yes. Runs entirely in your browser, no files uploaded.
Yes, works on any device with a modern browser.
No, everything runs in your browser.