Generate IDs for seed data
UUIDs are convenient when test data needs stable-looking unique identifiers.
Output
6d2f4f9e-8d25-4fc8-a3c4-2b7b5c8e9c10
55d2d98a-8c30-4a3b-a02a-f49755f3a327Developer toolsRuns locally
Local UUID v4 Generator
Generate one or many v4 UUIDs in your browser for tests, fixtures, records, and temporary identifiers.
uuidgeneratorv4id
Privacy note: this tool runs in your browser; inputs are not uploaded. How privacy works
Options
Generate between 1 and 100 v4 UUIDs.
UUIDs
Generated UUIDs will appear here.
UUID Generator examples
UUID Generator use cases
- Create IDs for local test fixtures.
- Generate sample identifiers for docs or mock API responses.
- Batch-generate values for temporary records.
How UUID Generator works
- The browser crypto API generates random bytes.
- Bytes are formatted as RFC 4122-style version 4 UUIDs.
- Generated values stay on your device unless you copy them elsewhere.
UUID Generator mistakes to avoid
- UUIDs are identifiers, not secrets.
- Random UUIDs are not naturally sortable by creation time.
- Do not use UUID generation as an authorization mechanism.
UUID Generator privacy and processing
No uploadBrowser-localNo accountThis tool runs in your browser. Inputs are processed on your device and are not uploaded to LocalTools.
How LocalTools handles local and server-assisted toolsUUID Generator related workflows
How LocalTools handles local and server-assisted tools
Understand which tools stay in the browser and which public URL checks need an API request.
Local-First Developer Tools for Sensitive Data
A practical hub for choosing browser-local tools when working with JSON, JWTs, PDFs, images, hashes, and other data you hesitate to paste online.
UUID Generator FAQ
Are UUID v4 values guaranteed unique?
They are random with an extremely low collision probability, but uniqueness is still probabilistic.
Can I use a UUID as a password?
No. UUIDs are identifiers. Use the Password Generator for passwords or tokens.