UUID Generator
Create random UUID v4 identifiers for apps and databases.
UUID v4
Version 4 UUIDs use cryptographically strong random values from your browser.
In-depth explanation
Generate one or many random UUID v4 identifiers using the browser’s crypto APIs — useful for IDs, seeds, and test data. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
Version 4 (random). Not time-based (v1) or name-based (v3/v5). Collision risk is vanishingly small for normal use. They are not cryptographic secrets.
UUIDs are generated locally in your browser. Tweak the inputs above to compare options, then copy or note the result you need.
UUID v4 is random 122 bits of identity. Collisions are negligible for normal app IDs. They are not secret tokens — do not use them as session secrets.
This is not v1 (time-based) or name-based v5. Generate many for fixtures. They are created locally; we do not log them.
Frequently asked questions
Which UUID version is generated?
Version 4 (random). Not time-based (v1) or name-based (v3/v5).
Are UUIDs unique?
Collision risk is vanishingly small for normal use. They are not cryptographic secrets.
Is anything uploaded?
No. UUIDs are generated locally in your browser.
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