Generate up to 1,000 UUID v4 values instantly. No signup, no upload — every UUID is created locally in your browser.
UUID (Universally Unique Identifier) v4 is a 128-bit identifier generated using cryptographically random bytes. Each UUID looks like 550e8400-e29b-41d4-a716-446655440000 and has a probability of collision so low it is effectively impossible in practice.
UUID v4 is the go-to choice for primary keys in databases, session tokens, file names, correlation IDs, and any scenario where you need unique identifiers without a central registry or coordination between services.
What's the difference between UUID v1 and v4?
UUID v1 is based on the current timestamp and the generating machine's network address, which can leak information about when and where it was created. UUID v4 is generated from random bytes only, which is why it's the standard choice for most applications today. This tool generates UUID v4.
Are these UUIDs cryptographically random?
Yes. The generator uses crypto.getRandomValues(), the same cryptographic random number source your browser uses for TLS, so each UUID is genuinely random rather than predictable.
Can I generate UUIDs in bulk?
Yes, you can generate up to 1,000 UUID v4 values at once and copy them all with one click.
Do I need an account or internet connection?
No. Everything runs locally in your browser — no signup, no server round-trip, no data leaves your machine.
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