ToolForge Online

Developer tool

UUID Generator

Generate UUID v4 values locally in your browser using secure browser randomness.

UUID options

Generate between 1 and 100 UUIDs at a time.

Generated UUIDs


            
UUIDs are generated locally in your browser and are not sent to a ToolForge Online server.

          

        



          
          
What is a UUID?
A UUID is a standardized identifier often used to label records, test data, files or objects without relying on a central counter.

          
What UUIDs are used for
Developers often use UUIDs for database rows, temporary test objects, imported data, local prototypes and unique references.

          
What is UUID v4?
UUID v4 is a random UUID format. This tool uses secure browser randomness through crypto.randomUUID or crypto.getRandomValues.

          
Not a password or secret token
A UUID is an identifier, not a password. Do not use UUIDs alone as secret access tokens or security credentials.

          
Practical guidance
What this tool does
UUID Generator generates UUID v4 identifiers locally in the browser.
When to use it
Use it for test data, prototypes, sample records, local imports or workflows that need unique-looking identifiers.
Example use
For example, generate ten UUIDs for a mock dataset, copy the list and paste it into a test file or spreadsheet.
How it works
The tool uses secure browser randomness where available and formats values according to the UUID v4 pattern.
Limitations
The output creates identifiers, not secrets; do not use UUIDs alone as passwords, access tokens or proof of authorization.
Privacy note
The tool generates UUIDs locally in your browser and does not upload them to ToolForge Online.

          
FAQ
Are the generated UUIDs really unique?
UUID v4 values are random with an extremely low collision probability, which is why they are widely used as identifiers. For everyday development tasks you can treat them as unique, but nothing mathematically guarantees uniqueness across systems.
Can I use these UUIDs in production databases?
Yes. The values follow the standard UUID v4 format and are generated with secure browser randomness, so they are as valid as UUIDs generated by a backend library.
Why should I not use a UUID as a password or token?
A UUID is an identifier, not a secret. Its format is predictable and it is often logged or exposed in URLs, so use a proper password generator or a signed token for anything security-related.
Are the UUIDs sent to a server?
No. The values are generated by your browser's crypto API on your device and never leave the page unless you copy them somewhere yourself.