Developer Tool
UUID Generator workspace
Generate cryptographically secure UUID v4 values using the browser's native crypto.randomUUID() API. Copy individually or copy all at once.
Quick select
UUID v4 — random identifiers with 122 bits of entropy. Suitable for database primary keys, session tokens, request tracing, and distributed systems where uniqueness is required without coordination.
5 UUIDs ready
d684cd70-467e-4953-a295-3f4101ce1f8120f6bdc6-5a4d-46fb-b764-96b4b94dedec1f31084e-ed23-4222-9184-c8dc91b9c0984cff785b-5117-455d-a98c-1a65feb1853963277e3d-24b8-4e52-84b6-afe0f5d171de
5 UUIDs generated. Copy individually or copy all at once.
How to use
Step 1
Choose how many UUIDs to generate using the quick-select preset buttons (1, 5, 10, 25, 50) or type a custom number from 1 to 100.
Step 2
Click the Generate button to create fresh UUID v4 values instantly.
Step 3
Copy a single UUID by clicking the Copy button next to it, or copy the entire list using the Copy all button.
Step 4
Click Regenerate to replace the current set with a new batch of the same size without changing any settings.
Step 5
Paste the UUIDs directly into your code editor, database tool, API client, or test data file.
Generated output examples
These examples show the kinds of outputs and scenarios this generator is designed to support.
Example 1
Generate 10 UUIDs at once to seed a test database with unique primary keys for integration testing.
Example 2
Generate a single UUID to use as a unique session token or idempotency key for an API request.
Example 3
Generate 50 UUIDs and copy all to populate a fixture file for a distributed system data migration.
UUID Generator FAQ
What is a UUID?
UUID stands for Universally Unique Identifier. It is a 128-bit label used to uniquely identify information in computer systems. The standard format is 32 hexadecimal digits arranged in five groups separated by hyphens, for example: 550e8400-e29b-41d4-a716-446655440000.
What is UUID v4 and why does this tool use it?
UUID v4 is a randomly generated identifier with 122 bits of entropy. It does not embed timestamps, MAC addresses, or other system information — making it safe for public-facing contexts. It is the most widely used UUID variant for general-purpose unique identifier generation.
Is this generator secure?
Yes. The generator uses crypto.randomUUID(), a Web Cryptography API built into modern browsers. This API uses a cryptographically secure pseudorandom number generator (CSPRNG) — the same class of randomness used for cryptographic keys. No UUID is transmitted to any server.
Can two generated UUIDs ever be the same?
In practice, no. UUID v4 has 2^122 possible values — roughly 5.3 undecillion combinations. The probability of generating a duplicate even across trillions of values is astronomically low and negligible for any real-world use case.
What is the difference between a UUID and a GUID?
GUID (Globally Unique Identifier) is Microsoft's term for the same concept. GUIDs and UUIDs follow the same standard (RFC 4122) and are interchangeable in practice. Some tools display GUIDs in uppercase without hyphens, but the underlying format is the same.
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