Developer Tools
Generate UUIDs
Generate UUID values for testing, databases, fixtures, and development workflows.
Direct Answer
Use the UUID Generator when you need random unique-looking identifiers for development, testing, database rows, fixtures, or API examples.
What UUIDs are used for
A UUID gives you a practically unique identifier without needing a central authority to hand out numbers in sequence.
- Primary keys for database rows, especially in distributed or offline-capable systems
- Unique identifiers for API resources, requests, or trace and correlation IDs
- Generating realistic-looking test data and fixtures for development and QA
- Idempotency keys so a retried API call isn't processed twice
- Identifiers in distributed systems that need to be generated without coordinating with a central server
UUID versions and randomness
Not all UUIDs are generated the same way, and it's worth knowing which version you're producing.
- This tool generates version 4 UUIDs, which are based on random values
- Version 1 UUIDs instead derive from a timestamp and a network-card-derived identifier, which can leak information about when and where they were created
- For version 4 UUIDs, collisions are astronomically unlikely in practice, though not mathematically impossible
- A UUID is an identifier, not a secret or a cryptographic security token
- The standard text format groups 32 hexadecimal digits as 8-4-4-4-12, separated by hyphens
Specific Use Cases This Tool Handles
Common situations where this tool helps, and what to do in each.
| Use Case | How This Page Helps |
|---|---|
| Copy-ready variations | Generate several options, copy the best result, then regenerate when you need another batch. |
| Fast naming and content drafts | Use generated output as a starting point for captions, titles, names, snippets, or random values. |
| No account workflow | Run the generator in the browser without signing into a large creative suite. |
How to Use UUID Generator
- Set your options (length, type, count) using the controls.
- Click Generate to produce new results.
- Click Copy next to any item to copy it individually, or Copy all to get everything.
- Download .txt saves all generated results as a text file.
- Click Generate again for a fresh set.
Reference
| Feature | Details |
|---|---|
| Purpose | Generate reusable output from selected options. |
| Input | Settings such as count, length, format, or topic. |
| Result | Generated items ready to copy. |
| Best for | Fast ideas, random values, names, passwords, codes, and reusable snippets. |
| Category | Developer Tools |
| Works on | Desktop, tablet, and mobile browsers |
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Frequently Asked Questions
What does a UUID actually look like?
A UUID is written as 32 hexadecimal digits grouped into five sections separated by hyphens, in an 8-4-4-4-12 pattern, giving a 36-character string such as 550e8400-e29b-41d4-a716-446655440000.
Are two randomly generated UUIDs guaranteed to never collide?
Not mathematically guaranteed, but for version 4 UUIDs the probability of a collision is so astronomically small that it's treated as effectively impossible in any real-world use case.
What UUID version does this tool generate?
This tool generates version 4 UUIDs, which are built from random values. That's different from version 1 UUIDs, which are derived from a timestamp combined with a network-card-based identifier instead of pure randomness.
Is a UUID the same thing as a secure token or API key?
No. UUIDs are designed to be unique, not secret or cryptographically unguessable. Raw UUIDs shouldn't be used as session tokens, password reset tokens, or API keys without additional safeguards like proper cryptographic randomness and expiry controls built specifically for that purpose.
Can I use a UUID as a primary key instead of an auto-incrementing integer?
Yes, this is a common pattern, especially useful when IDs need to be generated client-side or across distributed services without central coordination. The tradeoffs are larger storage size per row and generally less natural sortability than sequential integers, unless you use a time-ordered variant like UUIDv7.
Why do UUIDs contain hyphens?
The hyphens are purely a formatting convention that splits the 32 hexadecimal digits into the standard 8-4-4-4-12 grouped layout for readability; they don't carry any additional meaning themselves.
Does a UUID reveal any information about when or where it was generated?
For version 4 random UUIDs, no, they're built entirely from random bits with no embedded timestamp or machine information. Other versions, like version 1, do embed timestamp and network information, which can be a privacy consideration if that version is used.
Can I generate multiple UUIDs at once for test data or fixtures?
Yes, this tool supports generating a batch of UUIDs at once, which is convenient for quickly populating test fixtures, seed data, or example API payloads.