UUID
Generate a UUID online
UUID and GUID: v4, v7 and other versions for APIs and tests, one or a batch.
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What this UUID generator can do
- All versions: v1, v3, v4, v5, v6, v7 plus NIL and MAX
- Bulk generation with a custom count
- Formats: uppercase, no hyphens, braces
- v3/v5 with namespace and name
- UUID inspector: version, variant, v7 time
- One-click copy of the whole list
How to generate UUIDs online
Pick a version
v4 for random IDs, v7 for time-ordered IDs, v5 for name-based ones.
Set count and format
Choose how many UUIDs to generate and how to format them.
Generate and copy
The list appears instantly — copy items one by one or all at once.
Inspect an existing UUID
Paste any UUID to see its version, variant and embedded v7 time.
Frequently asked questions
Which version should I use?
v4 is the safe default. Choose v7 when IDs become database keys — they sort by creation time and index better.
What are NIL and MAX UUIDs?
Special values: NIL is all zeros (like a null), MAX is all ones — handy as sentinel boundaries.
What is inside a v7 UUID?
A Unix timestamp in milliseconds plus random bits, so v7 values stay roughly time-ordered.
Can two v4 UUIDs collide?
Practically no: there are 2^122 random v4 values — collisions are astronomically unlikely.