UUID Generator
Generate UUIDs in v1, v4, v5, and v7 formats — instantly, in bulk, with flexible formatting. Your data never leaves your device.
Version
Count
Format
Hyphens
Output
v4 uses crypto.randomUUID() — cryptographically secure. v7 is time-ordered (sortable). v5 is deterministic (same input → same UUID).
Frequently Asked Questions
- Is this UUID generator free?
- Yes, 100% free. No account, no limits, no sign-up required.
- Are my UUIDs safe and private?
- All UUIDs are generated locally in your browser using the Web Crypto API. Nothing is sent to any server.
- What is the difference between UUID v1, v4, v5, and v7?
- v1 is time-based and includes your MAC address; v4 is completely random (most widely used); v5 is deterministic — the same namespace and name always produce the same UUID; v7 is time-ordered (sortable) and is ideal for database primary keys.
- Which UUID version should I use?
- Use v4 for general-purpose unique IDs. Use v7 if you need sortable IDs for databases. Use v5 when you need a stable ID derived from a name (e.g. a URL). Use v1 only when time-ordering with the generating machine's identity matters.
- Can I generate multiple UUIDs at once?
- Yes. Select 1, 5, 10, 25, or 50 from the Count selector and use Copy All to copy them all at once.
- Does it work on mobile?
- Yes, works on all modern browsers including mobile Safari and Chrome on iOS and Android.