Quick take
Generate fresh UUIDs in bulk when you need safe placeholder IDs.
- Generate five UUID v4 values for test database records.
- Create uppercase GUIDs with braces for a Windows-oriented workflow.
UUID / GUID Generator
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When this page makes sense
Use UUID / GUID Generator for creating identifiers for tests, fixtures, database rows, events, jobs, and temporary integration records. It works well when you want single or bulk UUID/GUID values ready to copy and do not need a bigger workflow around it.
- Best fit: creating identifiers for tests, fixtures, database rows, events, jobs, and temporary integration records.
- You start with the number of UUID v4 values needed.
- The useful choices are quantity, casing expectations, and whether the target system wants UUID or GUID terminology.
- Check duplicate values, line count, and whether braces or prefixes are required by the consuming system.
- You end up with single or bulk UUID/GUID values ready to copy.
How to use UUID / GUID Generator
- Start with the number of UUID v4 values needed.
- Choose quantity, casing expectations, and whether the target system wants UUID or GUID terminology.
- Run the tool once, then review duplicate values, line count, and whether braces or prefixes are required by the consuming system.
- Copy, export, or download single or bulk UUID/GUID values ready to copy.
- Test one result in the destination before you create a larger batch.
How it behaves
- UUID v4 values use the browser crypto-backed crypto.randomUUID() API.
- Formatting options are applied locally after generation without changing the underlying random value.
- The timestamp-style option is intended for local test identifiers, not strict RFC 4122 v1 node identifiers.
What to check before you keep the result
- Version 4 UUIDs are random identifiers; they do not encode time, machine identity, or business meaning.
- Random UUIDs are good for uniqueness in tests and records, but they are not a replacement for access tokens or secrets.
- Generate fresh IDs for fixtures instead of reusing production identifiers in screenshots or test data.
- Do not infer creation time or ordering from UUID v4 values because they are intentionally random.
How your data is handled
UUIDs are generated in your browser. Toolumina does not upload, log, or reserve generated identifiers.
FAQ
Does this generate UUID v4?
Yes. UUID v4 is the default and uses the browser crypto API.
Can I generate many UUIDs at once?
Yes. The quantity control supports bulk generation up to 100 values.
Can I remove hyphens or add braces?
Yes. Formatting options support uppercase, hyphen removal, and brace wrapping.