Generate Cryptographically Unique UUIDs (v4) In-Browser
Universally Unique Identifiers (UUID / GUID) uniquely identify database records, API transactions, session cookies, and distributed microservice entities without requiring centralized database sequence coordination.
TabKit UUID Generator utilizes the native crypto.randomUUID() Web API to generate RFC 4122 and RFC 9562 compliant version-4 UUIDs. Generate single or bulk batches in uppercase or lowercase with zero server uploads and total cryptographic privacy.
With 122 bits of randomness drawn from operating system kernel entropy, version 4 UUIDs provide astronomical collision resistance suitable for enterprise production databases.
UUID Versions at a Glance
- Version 1: Date-time and MAC address based (exposes device hardware).
- Version 4: 100% pseudo-random cryptographic generation (industry gold standard).
- Version 5: SHA-1 namespace and named string hashing.
- Version 7: Unix timestamp prefix with random suffix (ideal for B-Tree indexes).
Collision Probability & Math
A version 4 UUID consists of 32 hexadecimal digits across 5 groups: 8-4-4-4-12. 6 bits are reserved for variant and version, leaving 122 bits of true entropy:
Total Unique UUIDs = 2^122 ≈ 5.31 × 10^36
Frequently Asked Questions
What are the odds of a UUID v4 collision?
UUID v4 provides 122 bits of cryptographic entropy. Generating 1 billion UUIDs per second for 100 years would produce a collision risk of less than one in a billion.
Can I generate bulk UUIDs at once?
Yes. You can generate batches of up to 100 unique UUIDs simultaneously and copy them with one click.
Are generated UUIDs transmitted or saved?
No. All UUIDs are created in volatile client memory and erased immediately upon reloading the page.