UUID generator
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About UUID generator
UUID Generator creates cryptographically random UUID v4 identifiers using your browser's native crypto.randomUUID() API. Generate 8 UUIDs per click — entirely offline, no server, no tracking. The collision probability is effectively zero for any real-world use.
When to use UUID generator
- Generate unique IDs for database records, API resources, or test data fixtures
- Create idempotency keys for API requests that must not be processed twice
- Generate correlation IDs for distributed system request tracing
- Create unique filenames for uploads or temporary cloud storage objects
- Seed test databases with deterministic-safe unique primary keys
How it works
Each click calls crypto.randomUUID() eight times, a browser-native API backed by the operating system's cryptographically secure pseudo-random number generator (CSPRNG) — the same source used for TLS. UUID v4 format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is random hex and y is one of 8, 9, a, or b. With 122 bits of randomness, the probability of collision is 1 in 5.3×10³⁶.
Privacy & Security Guarantee
UUID generator processes all data locally inside your web browser. No input text, files, credentials, or outputs are ever transmitted to remote servers, logged to analytics databases, or retained across sessions.
Frequently Asked Questions
Common questions about this tool.
What is UUID v4? ▼
UUID (Universally Unique Identifier) version 4 is randomly generated. It contains 122 bits of randomness, producing identifiers so statistically unlikely to collide that they are treated as guaranteed unique in practice.
What is the difference between UUID and GUID? ▼
GUID (Globally Unique Identifier) is Microsoft's name for the same concept. UUIDs and GUIDs are interchangeable — same format (8-4-4-4-12 hex), same length (36 characters), same collision properties.
Are these UUIDs truly random? ▼
Yes. This tool uses crypto.randomUUID(), which is backed by the OS CSPRNG — the same entropy source used for TLS key generation and cryptographic operations. These are not pseudo-random values.
When should I use a UUID instead of an auto-increment integer? ▼
UUIDs are better for distributed systems where multiple nodes generate IDs independently (no central counter), for IDs that must be unpredictable (security), or when you need to generate the ID on the client before a server round-trip.
Is UUID generator free to use? ▼
Yes. UUID generator is completely free and executes locally inside your web browser. No registration, API token, or software installation is required.
Is my input data uploaded to any server? ▼
No. Nadhebe utilities execute 100% client-side in your web browser. Your text, payloads, or files never leave your device.
Can I use this tool offline? ▼
Yes. Once the page is loaded in your browser, the JavaScript execution environment runs locally without needing an active internet connection.
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