TEXT & DEVELOPER TOOLS
UUID Generator
Generate random UUID v4, time-ordered UUID v7 or ULID identifiers in bulk, choose the format, and inspect an existing UUID.
Quick answer: Pick UUID v4, UUID v7 or ULID, set how many you need and the format, run it, and copy the list.
Use UUID Generator ↓Loading the tool…
How to use UUID Generator
- Pick the identifier typeUUID v4 is fully random. UUID v7 and ULID start with a timestamp, so new values sort after older ones, which suits database keys.
- Set the count and formatGenerate up to 1,000 at once. Choose standard lowercase, UPPERCASE, no hyphens or braces to match what your system expects.
- Copy or downloadCopy the list for a script or test data, or download it as a file.
- Inspect a UUID (optional)Choose “Inspect a UUID” and paste one to see its version and variant and, for time-based versions, the timestamp.
About this tool
Developers need unique identifiers constantly: primary keys, test fixtures, request IDs, file names. This page generates them in your browser using the browser’s secure random source, in the version and format you ask for, and it can read an existing UUID back to you.
Common uses: Generate identifiers for test records, development fixtures, local prototypes and systems that need random UUID-shaped values.
Practical example: Generate only the number you need, copy the list into your test data, and use the application’s own ID policy for production records.
Important limitation: A random UUID is not an authorization token, encryption key or proof of identity. Follow your system’s requirements for uniqueness and security.
Identifiers are generated in your browser tab and are not stored or transmitted. Read the privacy information.
UUID v4, UUID v7 or ULID?
UUID v4 is 122 random bits and is the usual default. Collisions are so unlikely that you can treat each one as unique without checking. The downside appears in databases: random keys scatter inserts across an index, which can slow large tables.
UUID v7 and ULID place a millisecond timestamp in the first bits, followed by random data. New identifiers therefore sort roughly in creation order, which keeps database indexes compact and makes logs easier to read. The trade-off is that the creation time can be read from the identifier, so avoid them where that would leak information.
The format options only change how the same value is written. Removing hyphens or adding braces does not change uniqueness. Use the inspect mode to confirm the version digit of a UUID someone gave you, which is a quick way to tell a random one from a time-based one.
Frequently asked questions
Can I use these UUIDs as passwords?
No. Use a password generator for passwords and a proper secret-management process for credentials.
Are generated UUIDs stored?
They are generated in the browser and are not stored by Use Everyday Tools unless you choose to save them yourself.
Is my text sent to a server?
Identifiers are generated in your browser tab and are not stored or transmitted.
Can two generated UUIDs be the same?
For v4 the chance is vanishingly small, far below the risk of a hardware error. For v7 and ULID, the random section makes duplicates in the same millisecond equally unlikely.
What is the difference between a UUID and a GUID?
They are the same 128-bit format. GUID is the name used in Microsoft environments.
Are the identifiers generated securely?
They use the browser’s cryptographic random generator rather than Math.random, and nothing is sent from the page.