UUID Generator
Generate & decode UUIDs
UUID Generator: Generate & decode UUIDs. A free, browser-based tool from DevToolbox that runs entirely on your own device: no upload, no account, no tracking.
About the UUID Generator
Generate RFC 4122 version 4 UUIDs in bulk. Randomness comes from the browser's cryptographic random source, so the values are suitable for real identifiers rather than being seeded pseudo-random output.
Conversion is a two-step trip: your input is decoded from the source format into a plain in-memory value, then re-encoded into the target format. Round-tripping a value through both directions returns what you started with, apart from formatting that the target format cannot express.
What you can do with it
- UUID v4
- Generate UUID online
- UUID decoder
- GUID generator
How to use it
- Paste your input into the input pane.
- Pick the direction you want: encode or decode, source format or target format.
- The converted result appears immediately in the output pane.
- Use Copy to take the result, or pipe it into another tool from the workspace.
Questions
- Are these safe to use as database keys?
- Yes for uniqueness: a v4 UUID has 122 random bits, and the chance of a collision is negligible at any realistic scale. Whether random keys suit your index is a separate question; sequential identifiers like ULIDs cluster better in a B-tree.
- Is it free, and do I need an account?
- It is free and there is no account, no sign-in and no usage limit. There is nothing to register because there is no server keeping track of anything.
- Is my data uploaded anywhere?
- No. The tool is JavaScript that runs in the tab you already have open, and DevToolbox has no backend to send anything to. You can open the network tab and watch: after the page and its script load, nothing is sent while you work.
Related tools
The UUID Generator sits in Encoders & Converters, one of the 90 tools on DevToolbox.