¿Qué es Generador de UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value used to uniquely identify records, objects, and resources without a central authority handing out numbers. Our generator produces version 4 UUIDs — the random variant — using your browser's cryptographically secure random source, so every value is generated locally and never touches a server.
Developers reach for UUIDs whenever they need an identifier that is unique across systems and time: database primary keys, distributed system message IDs, idempotency keys for API requests, file names, session tokens, and test fixtures. Because a v4 UUID has 122 random bits, the odds of two ever colliding are astronomically small, which is exactly why they work without coordination between services.
Casos de uso
Aquí tienes las formas más comunes en que la gente usa Generador de UUID todos los días.
Database Primary Keys
Using UUIDs as primary keys lets you generate an ID on the client or any service before inserting a row, avoids exposing sequential counts to users, and makes merging data from multiple databases safe because keys never collide. Generate a batch here to seed tables or test migrations.
API Idempotency Keys
Payment and order APIs use idempotency keys so a retried request does not charge a customer twice. A fresh v4 UUID per operation is the standard choice. Generate one, attach it to the request header, and the server can safely de-duplicate.
Test Data and Fixtures
When writing tests or seeding a staging environment you often need many unique IDs at once. Set the count, copy all, and paste a block of UUIDs straight into your fixtures, JSON, or SQL inserts.
Distributed Systems and Messaging
Message queues, event logs, and microservices use UUIDs to correlate requests across services without a shared sequence. Because they are generated independently yet stay unique, they are ideal trace and correlation IDs.
Ejemplos
Generating a single key
Set the count to 1 and copy the value for a one-off identifier.
Count: 1 3f2504e0-4f89-41d3-9a0c-0305e82c3301 Bulk generation for seeding
Set the count to 20, toggle uppercase off, and "Copy all" to paste a column of IDs into your database seed file.
Count: 20 20 newline-separated v4 UUIDs Generador de UUID frente a Writing your own generator
Generating UUIDs here versus rolling your own in code.
| Característica | Toolorah | Writing your own generator |
|---|---|---|
| Cryptographically secure randomness | Yes — browser crypto API | Only if you use a secure RNG |
| Bulk generation | Yes — up to 100 at once | You write the loop |
| Format options (case, hyphens, braces) | Yes — toggles | Manual string handling |
| No setup or dependencies | Yes — open and copy | Requires a runtime or library |
Consejos para usar Generador de UUID
- Use the "No hyphens" option when you need a compact 32-character identifier for URLs or file names.
- The "Braces" option wraps each UUID in { } — the registry/GUID format expected by some Microsoft and .NET tools.
- v4 UUIDs are random, not sortable by creation time. If you need time-ordered IDs, look at UUID v7 or ULIDs instead.
- Never use a UUID as a security secret on its own — they are unique, not unguessable for auth tokens. Use a dedicated token for that.
Preguntas frecuentes
What version of UUID does this generate?
Version 4 (random). All 122 non-version, non-variant bits come from crypto.getRandomValues, the browser's cryptographically secure random number generator. This is the most common UUID type for general-purpose unique identifiers.
Are these UUIDs truly unique?
For all practical purposes, yes. A v4 UUID has 2^122 possible values. You would need to generate billions per second for many decades before the probability of a single collision became meaningful. No coordination between machines is required.
Is the generation done on a server?
No. Everything runs in your browser using the native crypto API. The UUIDs are never transmitted, logged, or stored anywhere, so they are safe to use for sensitive systems.
What is the difference between a UUID and a GUID?
They are the same thing. GUID (Globally Unique Identifier) is Microsoft's name for the UUID standard. The format and uniqueness guarantees are identical; only the terminology differs by ecosystem.
Can I generate UUIDs in bulk?
Yes — set the count up to 100 and use "Copy all" to get a newline-separated list, ready to paste into code, SQL, or a spreadsheet.