Generators
UUID Generator
Create secure random UUID v4 values.
Generate up to 100 random UUID v4 values locally in your browser.
About This Tool
Create random UUID v4 identifiers for test data, database records, API examples, fixtures, and temporary IDs. Generate a single value or a batch of up to 100, choose the format your system expects, then copy the values as separate lines.
How To Use It
- Enter how many UUIDs you need, from 1 to 100.
- Choose standard hyphenated, no-hyphen, braced, or URN output.
- Choose lowercase or uppercase output.
- Press Generate.
- Copy the generated UUIDs when needed.
Examples
Create fixture IDs
Generate 10 lowercase UUIDs and paste them into test data or seed records.
Match uppercase systems
Choose uppercase when working with systems or exports that display GUIDs in uppercase.
Use compact IDs
Choose no hyphens when a database field, file name, or test fixture expects a 32-character UUID string.
Useful Notes
UUID v4 format
UUID v4 values are random identifiers in the familiar 8-4-4-4-12 hexadecimal format, such as 7f6d2c4e-2c0f-4f54-9dd7-2f6a31c5f5b8.
Output formats
Standard output keeps hyphens, compact output removes them, braced output wraps the value in curly braces, and URN output prefixes it with urn:uuid:.
Local generation
The tool uses the browser crypto UUID API to create values on the page.
FAQ
Are UUIDs guaranteed to be unique?
UUID v4 values are random rather than centrally assigned, so collisions are extraordinarily unlikely but not mathematically impossible.
What is the difference between UUID and GUID?
GUID is Microsoft's common name for the same general identifier format. For most web and database work, the terms are used interchangeably.
Can I remove hyphens from a UUID?
Yes. Select the no-hyphens format to generate compact 32-character UUID strings.
Can I generate more than 100 at once?
This page limits each batch to 100 values to keep the interface responsive and easy to copy.
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