UUID Generator
Generate and inspect UUID variants including NIL, v1, v3, v4, and v5 values locally.
Generated locally. Up to 50 at a time.
Runs locally in your browser. Your input is not uploaded or stored. You can verify this in your browser’s network panel.
What does this tool solve?
Generate NIL, v1, v3, v4, or v5 UUIDs in batches of up to 50. v3 and v5 accept a namespace UUID and name for deterministic identifiers.
Continue with Password Generator, Hash Generator · UUID versions and when to use them
What examples should you start with?
One random UUID
version = v4 · quantity = 1e.g. 9b2f3b8e-2c7a-4f1d-9a3e-5c2d8f6a1b04Bulk generation
version = v1/v3/v4/v5 · quantity = 5050 UUIDs, one per line, ready to copyHow does it work?
v4 uses the browser cryptographic random source; v3 and v5 hash the namespace and name; v1 is time-based; NIL is the all-zero UUID.
Generation happens entirely in your browser — nothing is sent anywhere, and no list is kept after you leave the page.
What are the edge cases and limits?
- UUID v4 is random; v1 is time-based; v3 and v5 are deterministic name-based identifiers.
- Collisions are astronomically unlikely (2^122 possibilities) but the guarantee is probabilistic, not absolute.
- UUIDs are not secrets — do not use them as the only protection for a resource.
Technical reference
Related tools
- Password GeneratorGenerate strong random passwords with adjustable rules.
- Hash GeneratorCompute supported cryptographic hashes and encodings from text input locally.