UUID/GUID Generator
Generate UUID v4 values entirely in your browser.
A UUID (Universally Unique Identifier, also called a GUID) is a 128-bit value usually written as a 32-character hex string with hyphens, e.g. 550e8400-e29b-41d4-a716-446655440000. Version 4 is generated almost entirely from random bits, making collisions extremely unlikely — it's commonly used for database primary keys, request/trace IDs in distributed systems, file names, and session tokens.
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FAQ
Can UUIDs collide?
In theory there's a tiny chance, but v4 UUIDs have 122 random bits (~2^122 possible values), so in practice collisions are not a real concern.
How is v4 different from other versions?
v1 is based on a timestamp and MAC address (which can leak machine info), v3/v5 are deterministic hashes of a namespace and name (same input gives same output), and v4 is fully random — the simplest and most commonly used version today.
Is a UUID the same as a GUID?
Yes. GUID is Microsoft's implementation of the UUID standard. The format and usage are essentially the same, and UUIDs generated here work fine as GUIDs.