The selected number of hyphenated identifiers, each with 36 characters and a 4 at the start of its third group.
BROWSER UTILITIES · FREE JAVASCRIPT TOOL
UUID v4 Generator
Generate one or many cryptographically random UUID v4 identifiers in the browser.
Free to useNo sign-upRuns in your browser
JS
UUID GeneratorLocal browser processing
Ready in your browser
Your processed result will appear here.
A WORKED TASK
Generate unique-looking identifiers for records
Choose a count from 1 to 100 and generate UUIDs. Each line is a version 4 identifier created using the browser’s cryptographic random API. You can use the output for local test records or as candidate identifiers in an application that also enforces uniqueness.
A UUID identifies a record; it is not authorization to access it. Do not treat a public identifier as a password or assume that this tool registers the ID in an external system.
What to check
- Copy one full line, including its hyphens, rather than combining parts of several identifiers.
- Generate fresh IDs for fresh records; do not reuse a sample as a permanent shared identifier.
- Keep a database uniqueness constraint even when random collision risk is very small.
TESTED & REVIEWED
Know what this tool does—and where to double-check
- Reviewed by
- HTML Online Viewer project
- Last reviewed
- Processing
- Ordinary processing happens in this browser tab; the tool does not intentionally upload your source.
- Important limitation
- JavaScript checks and transformations cannot prove that application logic is correct. Test the result in its real project before publishing.
PRACTICAL EXAMPLE
Start with a small UUID Generator example
The built-in sample makes the accepted input visible before you use your own project data.Example input
Loaded in the workspace
Generate 5 UUIDsRun the sample first, then change one value at a time so each result remains easy to explain.
What this example demonstrates
Generate one or many cryptographically random UUID v4 identifiers in the browser.
Keep the original file, review the generated result and test production code in its real application before publishing.
COMMON QUESTIONS
UUID Generator FAQ
Is UUID Generator free?
Yes. It is free to use and requires no account.
Does UUID Generator upload my source?
No. Ordinary processing happens locally in the current browser. The JavaScript runner uses a short-lived isolated browser worker.
Can I import and export a file with UUID Generator?
Yes. Import a relevant JavaScript, JSON or text file, then save the input or processed result.