UUID Generator
Generate single or batch UUID v4 values.
Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint. TOOLGRID measures tool usage, not the content you enter.
- No TOOLGRID input upload
- No account
- Review before copy
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What this tool does
Create random UUID lists directly in the browser.
UUID Generator creates random UUID v4 values with configurable batch size.
The generated values are ready to copy into code, databases, or test data.
Where this tool earns its place
Create UUIDs to use as primary keys in databases, ensuring uniqueness across distributed systems without a central counter.
Generate a UUID to use as a unique file name when storing uploads, preventing collisions when multiple users upload files with the same name.
Generate batches of UUIDs to use as IDs for mock objects when writing tests or populating a development database.
What to check before relying on the result
- Performance and maximum practical input size depend on browser memory, device speed, and the structure of the input.
- Review the generated result before replacing or publishing an original file.
Open a nearby browser tool when you need to validate, convert, or reuse the result.
How to use
01Use Cases
Create UUIDs to use as primary keys in databases, ensuring uniqueness across distributed systems without a central counter.
Generate a UUID to use as a unique file name when storing uploads, preventing collisions when multiple users upload files with the same name.
Generate batches of UUIDs to use as IDs for mock objects when writing tests or populating a development database.
Use UUIDs as resource identifiers in REST APIs to prevent enumeration attacks that sequential IDs make possible.
Tips & Tricks
- 01UUID v4 is the right choice for most use cases
UUID v4 is randomly generated and does not encode any system information. It's the most commonly used version for database IDs and general unique identifiers.
- 02Generate multiple at once
Use the bulk generation option to produce dozens of UUIDs at once for seeding test databases or generating API keys.
- 03UUID is case-insensitive
UUIDs are conventionally lowercase but are case-insensitive by spec. A09E... and a09e... refer to the same UUID.
FAQ
02Are generated UUIDs truly unique?
UUID v4 uses 122 bits of random data, making collisions astronomically unlikely. The probability of generating two identical UUIDs is lower than one in a quintillion.
Are generated UUIDs sent to a server?
UUIDs are generated with the browser Web Crypto API. Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint.
What's the difference between UUID v1 and UUID v4?
UUID v1 encodes the MAC address of the generating machine and the current timestamp. UUID v4 is fully random. Use v4 for privacy and general use; v1 is rarely needed today.
Can I use a UUID as a password or secret?
UUID v4 contains 122 bits of randomness, which is sufficient for many token use cases, but it uses a standard format. For secrets, use a dedicated secret generator for higher-entropy output.
Is UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They follow the same RFC 4122 standard.