Unique IDs for every use
A UUID (also called a GUID) is a 128-bit identifier written as 32 hex digits, like f47ac10b-58cc-4372-a567-0e02b2c3d479. Version 4 UUIDs are fully random and the most widely used. Version 7, standardized in RFC 9562, starts with a timestamp, so new IDs sort in creation order — which keeps database indexes compact and fast.
Generate one UUID or up to 1,000 at once, in uppercase or lowercase, with or without hyphens or braces, as a plain list, JSON array, comma-separated values or a quoted SQL list. Paste any UUID into the inspector to see its version and variant, and for versions 1, 6 and 7, when it was created.
How to generate UUIDs
- 1
Choose version 4 or 7
Random, or time-ordered for databases.
- 2
Set how many
From 1 to 1,000.
- 3
Pick the format
Case, hyphens, braces and list style.
- 4
Copy or download
Or generate a new batch.
Key features
Cryptographically secure
Uses the browser's Web Crypto generator.
UUID v7 support
Time-ordered IDs with monotonic ordering within the same millisecond.
Bulk output formats
Lines, JSON, CSV or SQL.
UUID inspector
Version, variant and embedded timestamp.
Common uses
- Database primary keys: v7 IDs insert efficiently into B-tree indexes.
- Test data: Generate hundreds of IDs for fixtures and seeds.
- Distributed systems: Create IDs without a central counter.
Tips and good to know
- Use v4 when IDs must not reveal when they were created; v7 exposes its creation time to anyone who inspects it.
- Need random strings instead of UUIDs? Try the Random String Generator.