Overview
This tool generates a fresh UUID v4 each time you use it. UUIDs are commonly used as unique IDs for database rows, API objects, file names, and temporary test records. The output is a 36-character identifier in the standard 8-4-4-4-12 format with hyphens. Each generated UUID is random and designed to be unique enough for normal development work. You can create one value at a time when you need a single identifier, or generate several values for sample data, mocks, or seed scripts. If you are comparing values, remember that UUIDs are identifiers, not timestamps or counters. They do not encode meaning, so two UUIDs can only be compared for exact equality, not ordered by size or time.
Use cases
- Database row keysAssign a unique ID to new user, order, or document rows without relying on sequential numbers.
- API payload identifiersAdd a request, job, or resource ID to JSON payloads so each object can be tracked independently.
- Temporary test fixturesCreate realistic IDs for mocks, fixtures, and seeded data during development or QA.
- File and folder namingUse a UUID when you need a name that is unlikely to collide with existing files.
How it works
- 1
Click generate to create a new UUID v4.
- 2
Copy the value into your code, database, or configuration.
- 3
Generate more values whenever you need additional identifiers.
Examples
New user record
Input: Generate 1 UUID for a user table row
Output: 9f0e4a56-2b8d-4d1c-9a4f-3c2c8c6d2f91
A stable-looking identifier for inserting a new user record.
Job tracking ID
Input: Generate 1 UUID for a background export job
Output: 3d7b9f1c-8e21-4b6b-a9c0-5f8d4e1a7b33
Useful when a queue worker needs a unique job reference.
Multiple fixture IDs
Input: Generate 3 UUIDs for test data
Output: ["b2c4f7a1-1d6a-4f79-b7f9-0f4d2a9c6d10", "6a8e1d33-5f7b-4af8-9f0a-1b2c3d4e5f60", "e1f0a9c8-77d2-4a0b-8d3e-9c6f1a2b3c44"]
Handy when preparing a small batch of mock records.
FAQ
Is the generated UUID a version 4 UUID?
Yes. The tool returns UUID v4 values, which are random-based identifiers in the standard 8-4-4-4-12 format.
Can I assume two generated UUIDs will never match?
No system can guarantee absolute impossibility, but UUID v4 collisions are extremely unlikely for normal development use.
Why do the values contain hyphens?
Hyphens are part of the standard UUID presentation format. If your system expects a compact form, remove the hyphens before saving.
Can I use the UUID as a secret token?
No. A UUID is an identifier, not a password or cryptographic secret. Use a dedicated token generator for sensitive values.
What mistake should I avoid when storing UUIDs?
Do not trim characters, change case rules unexpectedly, or treat UUIDs as numbers. Store them exactly as required by your system.