UUID Generator
Create UUID v4 or v7 identifiers in bulk, generated on your device with a secure random source.
- count
- 5
Output
f6d29761-1237-4455-80a1-d059c2de5e71 5ec969c9-0737-42cc-847e-5d2ca9a0c422 07a98481-d9d6-4e3c-a2a8-a07436f02985 227c2270-3d02-4a20-8d27-c1126b92d7c2 a9eb14c9-c14f-4adf-8efa-c39fdc8258be
Your files stay on your device
This tool runs entirely in your browser. What you paste is processed on your device and is never sent to a server, so it is safe to use with tokens, keys and unpublished text.
How it works
- Choose the version: v4 for fully random identifiers, v7 for identifiers that sort by creation time.
- Set how many you need, from 1 to 500. Each one is generated independently.
- Turn on Uppercase if your codebase or database convention expects capital hexadecimal letters.
- Press Generate UUIDs, then copy the list. Each UUID is on its own line, ready to paste into a fixture, a spreadsheet or a migration.
Frequently asked questions
- What is the difference between UUID v4 and v7?
- v4 is 122 bits of pure randomness. v7 (RFC 9562) starts with a 48-bit Unix millisecond timestamp followed by random bits, so UUIDs created later sort after earlier ones. That makes v7 a much better primary key for databases like PostgreSQL or MySQL, where random v4 keys fragment B-tree indexes.
- How random are these UUIDs?
- They are generated with crypto.getRandomValues, the browser's cryptographically secure random number generator, and with crypto.randomUUID where available. They are not produced with Math.random.
- Can two generated UUIDs collide?
- For v4 the chance is astronomically small: you would need to generate about 2.7 quintillion UUIDs to reach a 50 percent probability of one duplicate. v7 additionally embeds the timestamp, so collisions would also require the same millisecond.
- Does a v7 UUID reveal when it was created?
- Yes, the first 48 bits are the creation time in milliseconds. If exposing creation time is a problem, for example in public URLs, use v4 instead.
- Are the UUIDs generated on a server and logged?
- No. They are created in your browser and are never sent anywhere. Nouplo has no record of the identifiers you generate.
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