Generate secure UUID v4 identifiers.
Create one or many RFC 4122 UUID v4 identifiers using browser cryptographic randomness. Control quantity and letter case, then copy or download the results.
Generate one or hundreds of RFC 4122 UUID v4 identifiers using browser cryptographic randomness, with quantity controls, uppercase or lowercase output and bulk export.
About This Tool
ToolsFaction UUID Generator creates UUID v4 identifiers for development, testing, databases, APIs and other workflows that need random unique identifiers. Generate a single UUID or a batch of up to 500 values, choose lowercase or uppercase formatting and copy or download the complete list.nnUUID v4 values are generated with browser cryptographic randomness. The tool also checks the generated batch for duplicate values and displays the number of unique results.
How to Use
- Enter a quantity from 1 to 500.
- Choose lowercase or uppercase UUID formatting.
- Select Generate UUIDs to create a new batch.
- Copy all generated UUIDs or download the complete list as a TXT file.
Example
Set Quantity to 100 and Letter Case to Lowercase to create 100 UUID v4 identifiers for test records, database seeds or API development.
Frequently Asked Questions
Which UUID version does this tool generate?
The generator creates UUID version 4 identifiers.
How many UUIDs can I generate at once?
You can generate from 1 to 500 UUIDs in a single batch.
Can I enter a quantity above 500?
No. The quantity is strictly limited to the supported range of 1 to 500.
Are the UUIDs generated with secure randomness?
The tool uses browser cryptographic randomness through the Web Crypto API, including crypto.randomUUID when available.
Can I generate uppercase UUIDs?
Yes. Choose Uppercase from the Letter Case setting before generating the batch.
Can I download the generated UUIDs?
Yes. The complete list can be downloaded as a plain TXT file.
Are UUIDs sent to a server?
UUID generation runs directly in your browser and does not require a server-side generation request.