Security Tools
UUID Generator
Generate RFC 4122 version-4 UUIDs in bulk using the browser's native crypto.randomUUID(). Pick how many you need (1 to 1,000), toggle hyphens, casing and braces, then copy or download the list. Generation is local and instant.
Your input is processed locally in your browser. It is not uploaded to Dueneo.
Loading UUID Generator…
How to use
- 1
Pick how many UUIDs you need
Use the slider to choose between 1 and 1,000. The list regenerates automatically when you change the count or formatting options.
- 2
Toggle formatting
Switch hyphens on or off, choose lower or upper case, and optionally wrap each UUID in curly braces for Microsoft-style GUIDs.
- 3
Generate more
Click “Generate” for a fresh batch using the same settings. Each click draws new random bytes from crypto.randomUUID().
- 4
Copy or download
Use “Copy all” to put the list on your clipboard (newline-separated) or “Download .txt” to save it as a file.
Common use cases
- Generate primary keys for a database seed script.
- Create unique request IDs for a load test or batch job.
- Produce a one-off correlation ID for a distributed trace.
- Spin up test fixtures that need many unique identifiers at once.
Limitations
- Capped at 1,000 UUIDs per batch to keep the page responsive. Run the tool multiple times for larger batches.
- Only UUID v4 (random) is supported. UUID v1, v3, v5 and v7 are not generated here.
- Output formatting is applied uniformly to the whole batch.