🆔 UUID v4 Generator
The SolversPro UUID v4 Generator is a free browser-based developer utility that generates cryptographically secure, random 128-bit UUID (Universally Unique Identifier) strings client-side with zero server uploads.
UUID Version & Architecture Specifications (RFC 4122)
Standard specifications, generation mechanisms, and collision risk models across UUID variants.
| UUID Version | Generation Method | Collision Probability | Primary Use Case |
|---|---|---|---|
| Version 4 (Random) | CSPRNG pseudo-random bytes (122 random bits) | < 1 in 2.71 × 10¹⁸ (at 1B IDs) | Distributed database IDs, session tokens, request headers |
| Version 1 (Time-Based) | 60-bit timestamp + host MAC hardware address | Extremely low (clock-dependent) | Time-series indexing, ordered transaction logs |
| Version 5 (Namespace) | SHA-1 cryptographic hash of namespace + name | Deterministic (Zero for distinct names) | Idempotent identity generation from URLs or domain names |
| Version 7 (Epoch Sortable) | 48-bit Unix timestamp + random entropy | Negligible (sub-millisecond unique) | B-tree database primary keys, relational index optimization |
Frequently Asked Questions
How are UUID v4 identifiers generated in this tool?
Identifiers are generated using the browser's native crypto.randomUUID() API, utilizing cryptographic pseudo-random number generators (CSPRNG) seeded by system hardware entropy.
What is the collision probability of a UUID v4?
A UUID v4 contains 122 bits of random entropy. To have a 50% probability of a single collision, approximately 2.3 quintillion (2.3 x 10^18) UUIDs would need to be generated.
Can I customize the generated UUID formatting?
Yes. You can toggle between lowercase and uppercase characters, remove hyphens for a clean 32-character hex string, and batch generate up to 100 UUIDs at a time.
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