UUID Generator
Generate RFC4122 compliant UUIDs with multiple versions. 100% client-side — no data is sent to any server.
Selected: Random (v4) — 122 bits of random data - best for most use cases
UUID Versions Explained
v4 (Random): 122 bits of random data — best for most use cases
v1 (Timestamp): Time-based with MAC address — sortable but less private
v3 (MD5): Name-based with MD5 hashing — deterministic
v5 (SHA-1): Name-based with SHA-1 hashing — recommended for name-based UUIDs
🔒 All generation happens in your browser. No data is sent to any server.
How to use this UUID Generator
Generating UUIDs is simple with our free online tool. Select the UUID version you need from the options above. For most use cases, v4 (Random) is recommended.
If you need deterministic UUIDs, choose v3 (MD5) or v5 (SHA-1) and provide a namespace and name. Click Generate to create your UUID. You can copy it to your clipboard or generate multiple UUIDs at once.
What this UUID generator does
- ✓Multiple versions — Generate v1, v3, v4, and v5 UUIDs as per RFC 4122.
- ✓Bulk generation — Generate up to 100 UUIDs at once for batch processing.
- ✓Name-based UUIDs — Support for deterministic UUIDs using MD5 and SHA-1.
- ✓Validation — Validate UUIDs and detect their version automatically.
- ✓100% client-side — All generation happens in your browser. No data is sent to servers.
- ✓No sign-up required — Completely free to use with no account needed.
Common use cases
- •Generate unique primary keys for database records
- •Create unique identifiers for distributed systems
- •Generate tracking IDs for orders and transactions
- •Create unique session IDs for web applications
- •Generate unique IDs for log entries and events
- •Create deterministic identifiers for resources using name-based UUIDs
💡 Pro Tips
- •Use v4 for most general purposes — it's the most common and widely supported
- •Use v5 instead of v3 for name-based UUIDs — SHA-1 is more collision-resistant than MD5
- •Store UUIDs as CHAR(36) in SQL databases or use BINARY(16) for better performance
- •For time-sorted UUIDs, consider v1 or v7 (when available) for better index performance