UUID Generator
Generate v4 UUIDs in batches of 1, 5, 10, 25, 50, or 100 using crypto.randomUUID. Toggle uppercase and hyphens. Browser-based, nothing uploaded.
settingsSettings
What is the UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit number written as 32 hex digits in the canonical 8-4-4-4-12 pattern. Version 4 UUIDs draw 122 of those bits from a cryptographic random source, which makes the chance of two clients ever generating the same value vanishingly small. Backends use them as primary keys, request IDs, and idempotency tokens.
How to use the UUID Generator
- 1
Pick a quantity
Choose 1, 5, 10, 25, 50, or 100 from the buttons. The list refreshes the moment you click Generate.
- 2
Set format options
Toggle Uppercase if your system expects A-F, and Include hyphens if it wants the canonical 8-4-4-4-12 layout.
- 3
Generate
Click Generate to draw fresh UUIDs from crypto.randomUUID, the browser's RFC 4122 v4 implementation.
- 4
Copy what you need
Copy a single UUID with the icon next to it, or Copy All to grab the whole batch (newline-separated) for a SQL script or config file.
Frequently Asked Questions
What is a UUID?
A 128-bit identifier written as 32 hex digits in the canonical 8-4-4-4-12 pattern (for example, 550e8400-e29b-41d4-a716-446655440000). Version 4 UUIDs are mostly random, with 6 fixed bits encoding the version and variant. They're how distributed systems generate unique IDs without coordinating with a central database.
How are the UUIDs generated?
Through crypto.randomUUID(), the browser's built-in RFC 4122 v4 implementation. The 122 random bits come from the same cryptographically secure source the platform uses for HTTPS keys, so collisions are vanishingly unlikely (about 1 in 2^61 across all UUIDs ever generated).
How many can I generate at once?
Up to 100 per batch. Pick the quantity from the buttons in the sidebar (1, 5, 10, 25, 50, or 100). Generate as many batches as you need; the page handles thousands without slowdown.