Developer utility
Free UUID Generator Online
Create RFC4122 UUIDs in your browser with instant copy, hyphen and casing controls, and zero server logging.
UUID results
Click a row to copyGenerate your first UUIDs to see them here.
UUID best practices
- • Use standard lowercase hyphenated UUIDs for most APIs and databases.
- • Remove hyphens when working with systems that expect compact tokens.
- • Uppercase is occasionally required for legacy integrations; toggle when needed.
- • Keep a small batch size to avoid accidental duplicates in pasted data.
- • All generation happens locally using `crypto.randomUUID()` for secure randomness.
Need a quick copy?
Click any result row to place it on your clipboard instantly.