Free UUID v7 Generator Online

What Can the UUID v7 Generator Do?

The UUID v7 Generator is a pure frontend online tool for generating timestamp-based UUID v7 identifiers. UUID v7's first 48 bits are a Unix millisecond timestamp, making it naturally time-ordered and ideal for database primary keys and indexing. It supports batch generation of 1-1000 UUIDs, multiple output formats (standard/no-hyphen/uppercase/URN), and UUID v7 timestamp decoding. All generation uses crypto.getRandomValues() for cryptographic randomness — data is never uploaded to any server.

Core Features

Time-Ordered UUIDs: Based on Unix millisecond timestamps, naturally incrementing, ideal for database indexing
Batch Generation: Generate 1-1000 UUIDs at once for bulk unique identifiers
Multi-format Output: Standard 8-4-4-4-12, no-hyphen, uppercase, and URN formats
Timestamp Decoding: Enter a UUID v7 to automatically extract and convert the timestamp to readable date/time
Cryptographic Security: Uses crypto.getRandomValues() for random bits, ensuring uniqueness

How to Use

Step 1: Set the generation count (1-1000) and select the output format.

Step 2: Click "Generate UUIDs" or use Ctrl+Enter to see the results list.

Step 3: Click the "Copy" button next to individual UUIDs, or "Copy All" for batch copy.

Step 4: In the decode section, enter a UUID v7 and click "Decode" to view timestamp and version info.

Use Cases

Database Primary Keys

UUID v7 is naturally time-ordered, providing better index performance than UUID v4 as database primary keys, reducing B-tree page splits.

Distributed IDs

Generate globally unique IDs in distributed systems without centralized coordination, with timestamp prefix ensuring approximate ordering.

Event Tracking

Generate unique IDs for logs, events and messages, with timestamp prefix enabling time-range queries and sorting.

Order Numbers

Generate unique order numbers containing time information, ensuring uniqueness while allowing creation time extraction from the ID.

Extended Knowledge

UUID v7 (RFC 9562) structure: 48-bit Unix millisecond timestamp + 4-bit version (0111) + 12-bit random + 2-bit variant (10) + 62-bit random. Compared to UUID v4's complete randomness, UUID v7's timestamp prefix makes it naturally ordered, significantly improving database index performance. UUID v6 is an alternative to v7 with reversed timestamp ordering for compatibility with UUID v1 sorting. UUID v8 allows custom timestamp precision and random bit allocation.

FAQ

What's the difference between UUID v7 and UUID v4?

UUID v4 is completely random and unordered; UUID v7 is based on Unix millisecond timestamps with the first 48 bits as timestamp and remaining 74 bits random, naturally time-ordered and ideal for database indexing.

What is the time precision of UUID v7?

UUID v7 uses Unix millisecond timestamps (48 bits) with 1ms precision. UUIDs generated within the same millisecond use random bits to ensure uniqueness.

Is my data uploaded to a server?

No. All UUID generation is done locally in your browser using crypto.getRandomValues() for randomness. Data is never uploaded to any server.

Can I generate UUIDs in batch?

Yes. You can generate 1-1000 UUID v7s at once, with copy and download options for all results.

Can I decode a UUID v7 timestamp?

Yes. Enter a UUID v7 and the tool automatically extracts the first 48-bit timestamp and converts it to a readable date/time.

What output formats are supported?

Standard format (8-4-4-4-12), no-hyphen format, uppercase format, URN format, and JSON array format.