UUID generator
Generate random v4 or time-ordered v7 UUIDs, up to 1,000 at a time.
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How to use
- Choose v4 for random IDs or v7 for IDs that sort by creation time.
- Enter how many you need, from 1 to 1,000. New UUIDs appear straight away.
- Tick Uppercase or No hyphens to change the format.
- Press Copy all to copy them, one per line, or Generate new for a fresh set.
Questions
Should I use v4 or v7?
Use v4 when you only need a unique ID. Use v7 for database keys: it starts with a timestamp, so new rows land next to each other in an index, which is usually faster to insert than random v4 keys. The trade-off is that a v7 ID reveals roughly when it was created.
How random are they?
v4 UUIDs come from your browser's crypto.randomUUID(), which uses a cryptographically secure generator, and have 122 random bits. v7 UUIDs use crypto.getRandomValues() for their random part. Math.random() is never used.
Are v7 UUIDs made in the same batch in order?
Yes. Many IDs can share a millisecond, so a counter inside the UUID keeps them in creation order, as RFC 9562 allows.
Can two UUIDs ever be the same?
In theory, yes. In practice the chance is so small that you can treat them as unique, even across billions of IDs.
Are the UUIDs stored or sent anywhere?
No. They are generated on your device and disappear when you leave the page.
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