UUID v7 Generator
Generate modern time-ordered UUIDs with Unix timestamp
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UUID v4
Random UUIDs. Most commonly used for general purposes.
UUID v7
Time-ordered and random. Best for databases and sorting.
ULID
Sortable 26-char IDs. Perfect for distributed systems.
NanoID
Compact 21-char URL-safe IDs. Great for frontend use.
018f3b6e-7a5c-7def-8f3b-6e7a5c7def12What is UUID v7?
UUID v7 is the modern, recommended alternative to UUID v1 for time-ordered identifiers. It uses a Unix timestamp in milliseconds rather than the obscure 1582 epoch, making the timestamp human-readable and easier to work with.
Introduced in the latest UUID RFC draft, v7 provides the sortability benefits of v1 without exposing MAC addresses or using a complex timestamp format. The first 48 bits contain the Unix timestamp, followed by random bits.
Why Use UUID v7?
UUID v7 combines the best of v1 and v4: time-ordering for database efficiency plus random bits for privacy. Unlike v1, it doesn't leak hardware information. Unlike v4, it maintains chronological ordering for index performance.
The Unix millisecond timestamp makes debugging trivial—you can immediately see when an ID was created without special parsing. This is invaluable for distributed system debugging and data analysis.
How UUID v7 Works
UUID v7 structure:
1. Bits 0-47: Unix timestamp in milliseconds 2. Bits 48-51: Version (7) 3. Bits 52-63: Random or sub-millisecond precision 4. Bits 64-65: Variant (10) 5. Bits 66-127: Random data
The result is a UUID that sorts chronologically while remaining unpredictable in its lower bits.
Common Use Cases
- Modern distributed databases
- Event-driven architectures
- APIs requiring sortable resource IDs
- Replacing UUID v1 in new projects
Pro Tip
UUID v7 is now the recommended choice for new projects needing time-ordered IDs—it's v1 done right.
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