UUID Generator
Generate one or many random UUID (v4) values instantly using your browser's secure crypto API. Copy with one click.
v7 values remain lexically increasing within the same millisecond. Formatting never changes the underlying UUID.
Generate & decode UUIDs
Pick v1, v4, v7, NIL or Max and Generate. Paste any UUID into Decode to read its variant and, for v1/v7, its timestamp. Random fields use crypto.getRandomValues locally in your browser.
FAQ
Which UUID versions can it make?
Version 1 (Gregorian 100 ns timestamp + node), version 4 (fully random), version 7 (time-ordered), plus the RFC 9562 NIL and Max UUID values.
Can it decode a UUID?
Yes. Paste any UUID and it identifies NIL/Max values, shows the RFC variant, and extracts the complete v1 or v7 timestamp.
Are the UUIDs unique?
UUID v4 has 122 random bits. v7 combines a millisecond timestamp with a cryptographically seeded monotonic counter, and each generated batch is deduplicated.
Can I generate many at once?
Yes — choose how many (up to 1000) and copy them all or download as CSV. Everything is generated locally with a secure random source.
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