UUID Generator
Generate v4 UUIDs
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About this tool
This tool generates random UUIDs (universally unique identifiers). It creates version 4 (v4) UUIDs using the browser's crypto.randomUUID(), filling the randomly-determined bits of the 128-bit value with cryptographically secure randomness. You can generate 1 to 50 at a time.
How to use
- Pick how many to generate (1 / 5 / 10 / 50).
- Use the checkboxes to include hyphens and to show uppercase letters.
- Click regenerate to create a new set of the same count.
- Use the copy-all button for the whole list, or each line's copy button for a single value.
Frequently asked questions
- Is this v4, or some other UUID version?
- It's v4. It uses no timestamp or MAC address information โ only randomness โ so nothing about when or on what device it was created can be inferred from the value itself.
- Can two UUIDs collide?
- The probability is not zero in theory, but it is negligible in practice. A v4 UUID has 122 random bits, so the chance of ever seeing the same value twice is effectively negligible.
- Can I drop the hyphens or switch to uppercase?
- Yes. The checkboxes let you freely combine the 550e8400-e29b-... hyphenated form, a hyphen-free form, and upper/lowercase.
- Are the generated values sent to a server?
- No. They are generated entirely in your browser with crypto.randomUUID() and never sent to a server.