UUID Generator
Generate cryptographically random UUID v4 identifiers — one at a time or in bulk — instantly in your browser.
Click Generate to create a UUIDWhy Use PixConvert UUID Generator
The fastest, most private UUID generator — uses crypto.randomUUID.
Cryptographically Random
Uses crypto.randomUUID() — a CSPRNG-backed UUID v4 implementation built into modern browsers.
Bulk Generation
Generate up to 100 UUIDs at once and copy the full list to clipboard in one click.
Format Options
Toggle uppercase, braces (Windows GUID style), or no-hyphens format to match your target system.
100% Private
UUIDs are generated entirely client-side. Nothing is sent to any server.
Instant Copy
Click Copy to instantly copy a single UUID. Bulk copies all generated UUIDs as a newline-separated list.
No Repeats
Each UUID is statistically unique. The probability of collision is 1 in 5.3 × 10³⁶ — effectively zero.
UUID Use Cases
UUIDs are the standard way to generate unique identifiers without a central authority.
Database Primary Keys
Use UUIDs as primary keys in distributed databases to avoid auto-increment collisions across shards.
- PostgreSQL UUID columns
- MongoDB ObjectId alternative
- DynamoDB partition keys
Test Data
Generate realistic-looking IDs for test fixtures, seed data, and mock APIs.
- Seed test databases
- Mock API response IDs
- Populate fixture files
Session & Token IDs
Generate unique session identifiers, correlation IDs, and idempotency keys.
- Session token generation
- API idempotency keys
- Request correlation IDs
How to Generate a UUID
Click Generate to create a single UUID v4. Choose format options (uppercase, braces, no hyphens) as needed.
Click Copy to save it to clipboard. For multiple UUIDs, use Bulk Generate and Copy All.
Each UUID uses crypto.randomUUID for v4 randomness — collision-safe for database keys, file names, and request IDs.
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Frequently Asked Questions
UUID generation explained.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. It's represented as 32 hex digits in the format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUID v4 is randomly generated.
Is UUID v4 truly unique?
Statistically yes. UUID v4 has 122 random bits (6 bits are fixed for version/variant). The probability that two randomly generated UUIDs are the same is 1 in 5.3 × 10³⁶ — you'd need to generate billions of UUIDs per second for billions of years to see a collision.
What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. They're the same format — GUIDs are often displayed in uppercase with braces: {550E8400-E29B-41D4-A716-446655440000}. Use 'With braces' option to generate GUID-format output.
Should I use UUID v4 or v7?
UUID v4 is fully random. UUID v7 (RFC 9562) is time-ordered, which makes it much better as a database primary key — sequential inserts avoid B-tree fragmentation. v7 support in browsers is limited; for now, v4 is safe for most uses.
Can I use UUIDs as database primary keys?
Yes, but v4 UUIDs are random, which causes B-tree index fragmentation in databases like MySQL/PostgreSQL at high write volumes. For high-throughput systems, consider ULIDs or UUID v7 (time-ordered) instead.