UUID Generator
Generate secure random UUIDs in bulk.
Free UUID v4 generator. Create 1 to 100 cryptographically random UUIDs with optional hyphens and uppercase, then copy them all, in your browser.
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About UUID Generator
Whenever software needs an identifier that must be unique without checking a central registry, database rows, session tokens, idempotency keys, filenames, it reaches for a UUID. A version 4 UUID packs 122 bits of randomness into a 128-bit value, formatted as 32 hex digits in five groups. The collision odds are so small you can treat every generated ID as one of a kind.
This generator creates 1 to 100 UUIDs at a time using your browser's cryptographically secure random generator, with the version and variant bits set per RFC 4122, so they're real v4 UUIDs any system will accept. Toggle hyphens off for compact database keys, or uppercase on for systems that demand it, then copy the whole batch. Everything happens on your device, nothing is sent to a server, which matters when IDs are generated alongside sensitive work.
Two practical notes. First, format varies by system: some databases want the hyphenated form, others the 32-character compact form. Check what your target expects before generating a hundred of the wrong shape. Second, UUIDs are unique but not secret and not ordered: don't use one as a password, and know that random primary keys can fragment database indexes, which is why some teams prefer time-ordered variants for high-write tables.
How to use UUID Generator
- Choose how many UUIDs to generate (1–100).
- Toggle hyphens and uppercase to taste.
- Click Generate, then Copy all.
Why use this tool?
- Cryptographically secure randomness
- Bulk generation up to 100 at once
Tips for best results
- Generate in bulk: create up to 100 at once for seeding test data, migration scripts, or batch imports.
- Match the format: check whether your database or API wants hyphens, compact form, or uppercase before generating.
- Use them as idempotency keys: attach a UUID to each API request so retries can't create duplicates.
- Don't use UUIDs as secrets: they're unique, not unguessable credentials, use a proper secret generator for passwords and tokens.
- Keep a mapping: when replacing old IDs with UUIDs during a migration, store the old-to-new mapping before you cut over.