UUID generator
Generate UUID v1, v3, v4, v5, v6 and v7 locally. Choose random, time-based or namespace-and-name identifiers, then copy or download a batch as text or JSON.
Also known asGUID generator · UUID v4 generator · UUID v7 generator · Random UUID generator · UUID generator online
v4 is random. v1/v6/v7 expose time; v1/v6 use random node fields, never your device address. v3/v5 are deterministic, not secret tokens. Nil/Max are fixed constants. No global uniqueness or cross-batch ordering is guaranteed; results stay in this tab.
Three small steps.
- Choose a UUID version. Use v4 for random identifiers or v7 for Unix-time-based identifiers.
- For v3/v5, choose DNS, URL, OID, X.500 or a custom namespace UUID and enter one name per line. Other modes use the amount field.
- Choose standard, compact, GUID braces or URN formatting, optionally uppercase and JSON, then generate, copy or download.
A few things to know.
Up to 1,000 identifiers or name lines and one million UTF-16 input units. Empty lines are names; spaces, case and Unicode are preserved without normalization. v1/v6/v7 expose time, and v1/v6 use random node fields rather than device addresses. Nil and Max are fixed constants. Versions 2 and custom 8 are not generated. Random modes require cryptographic randomness; no external uniqueness check is made.
How your privacy works →A little more clarity.
Which UUIDs are time ordered?
v6 and v7 put time first; v4 is random. The generator uses worker-local clock/counter handling. Ordering across batches, tabs or devices is not guaranteed, and a device clock is not authoritative time.
Why do v3 and v5 repeat the same UUID?
They hash the namespace and exact UTF-8 name using MD5 or SHA-1. Identical version, namespace and name produce the same identifier, including duplicate or empty names. These identifiers are not secret tokens or password hashes.
Does the site store names or UUIDs?
No. Generation runs locally in a worker. Inputs and results remain in this tab until cleared, refreshed or closed; copy or download them if needed. Clear also removes the custom namespace and input history.
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