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UUID Generator
Generate random UUID v4 and GUID identifiers instantly. Click to generate one UUID or bulk-generate up to 100 at once. Multiple formats — free, no sign-up needed.
Format
Click Generate to create a UUID
Click the UUID above to copy it
How to Generate UUIDs
1
Choose your options
Select UUID version (v4 for random, v1 for time-based), quantity (1–100), case, and format (standard, GUID, no hyphens, or URN).
2
Click Generate
UUIDs are generated instantly in your browser using the Web Crypto API for true cryptographic randomness.
3
Copy or download
Click any UUID to copy it, or use "Copy All" for bulk output. Download all UUIDs as a .txt file.
UUID FAQs
What is a UUID used for?
UUIDs are used as unique identifiers in databases (primary keys), APIs (request IDs), session tokens, file names, and distributed systems where multiple systems need to generate IDs without coordination.
What is the difference between UUID v4 and v1?
UUID v4 is randomly generated — the most common type for general use. UUID v1 is based on the current timestamp and MAC address, making it sortable by time but less private (leaks your MAC address).
What is a GUID?
GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are the same format (32 hex characters with 4 dashes) but GUIDs are sometimes written in UPPERCASE and wrapped in {curly braces}.