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A Universally Unique Identifier (UUID) is a 128-bit value used to uniquely identify resources across systems without central coordination. UUIDs are commonly used for database keys, API identifiers, distributed systems, and anywhere you need collision-resistant IDs.
Includes timestamp and node information. Good for ordering, but can leak timing/device details.
Generated using randomness; simple and widely used. Most common choice.
Deterministic IDs from a namespace UUID and a name string using SHA‑1. Ideal for stable identifiers based on inputs.
Newer standard combining timestamp with random data. Better for sorting than v4.
| Version | Basis | Ordering | Typical Use |
|---|---|---|---|
| v1 | Time + node identifier | Mostly time-ordered | Legacy systems needing chronological sort; be mindful of metadata leakage |
| v4 | Random | Not ordered | General purpose IDs with extremely low collision probability |
| v5 | Name-based (SHA-1) | Deterministic per input | Stable IDs from a namespace + name (e.g., DNS, URLs) |
| v7 | Unix time + random | Time-ordered | Modern systems needing sort-friendly identifiers with good distribution |
Not sure whether a pasted ID is valid or which version it is? Use our UUID Decoder to validate, normalize, and detect the version.
UUID v5 creates deterministic IDs from a namespace UUID and a name string. Use a well-known namespace or your own.
# In the UI: choose v5, paste DNS namespace, name "example.com"
GET /api/uuid?version=v5&namespace=6ba7b810-9dad-11d1-80b4-00c04fd430c8&name=example.com
v5 is deterministic: the same namespace + name always yields the same UUID. For random unique IDs, prefer v4; for sortable IDs, consider v7.
Most commonly used
3f7c2b38-6c3e-4a5f-9f2a-2f0d8c9b9d31Includes timestamp
6ba7b810-9dad-11d1-80b4-00c04fd430c8Newer standard
01890b1c-7c3e-7c3e-7c3e-7c3e7c3e7c3eUse UUIDs as primary keys to avoid coordination costs and to generate IDs on the client side. Perfect for distributed databases.
Safer than sequential IDs for URLs and API resources, making enumeration more difficult and improving security.
Generate unique filenames to prevent conflicts when uploading files or creating temporary files in applications.
Create unique session IDs for user authentication and tracking without revealing sequential patterns.
Privacy First: All UUID generation happens locally in your browser. No data is sent to our servers.
UUIDs are not inherently secret; avoid treating them as authentication tokens. Prefer random v4 for general use; use v5 when deterministic IDs are required.
v4 uses randomness with an astronomically low collision probability for typical applications. The chance of generating the same UUID twice is virtually zero.
UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID. Both follow the same RFC 4122 standard.
Use v4 for general purposes (most common). Use v1 if you need time-based ordering but be aware of privacy implications. Use v7 for modern applications that need time-ordered UUIDs with better privacy.
You can generate 1–1000 UUIDs at once. For very large batches or automation, use our API endpoint below.
Generate UUIDs programmatically. Supports v1, v4, v5 (name+namespace), and v7.
GET /api/uuid?version=v4&count=5 GET /api/uuid?version=v5&namespace=6ba7b810-9dad-11d1-80b4-00c04fd430c8&name=example.com
Validate UUIDs, detect version (v1, v4, v5, v7), and normalize format locally.
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