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UUID generator

Generate UUID v7, v4, v5, v3, v1 or v6 in bulk, in several output formats.

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This free UUID generator creates universally unique identifiers instantly — v4 (random), v1 (timestamp) or v5 (name-based). UUIDs are 128-bit values used as database keys, request IDs and identifiers in distributed systems where you need uniqueness without a central authority. Generate one or many and copy them in a click.

How to use it

  1. Open the generator — a UUID is created automatically.
  2. Generate a new one whenever you need it.
  3. Copy the UUID and paste it where you need it.

Frequently asked questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value written as 36 characters, like 550e8400-e29b-41d4-a716-446655440000, used to identify something uniquely.

Are UUIDs guaranteed to be unique?

Practically, yes. A version-4 UUID has 122 random bits, so the chance of two colliding is astronomically small — safe to treat as unique.

What is UUID version 4?

Version 4 is the most common UUID: it's generated from random numbers, so it needs no MAC address, timestamp or coordination.

Where are UUIDs used?

As primary keys in databases, correlation/request IDs in logs and APIs, file names, and identifiers in any distributed system.

What does UUID generator do?

Generate UUID v7, v4, v5, v3, v1 or v6 in bulk, in several output formats.

When would I actually use this?

Verifying a download matches its published checksum, comparing two files without reading them, and generating a signature for an API request.

What is the most common mistake?

Hashing a password with a fast algorithm. MD5 and SHA are built to be quick, which is exactly wrong for passwords — those need a deliberately slow function like bcrypt, scrypt or Argon2.

How is UUID generator different from UUID Validator / Decoder?

They sit next to each other but answer different questions: UUID Validator / Decoder is the one to open when you need it to validate UUIDs and decode their version, variant, and the timestamp and MAC a v1 carries. Pick whichever matches what you're starting from — both are free.

Where do the figures come from?

The digests follow their published specifications and are computed by the browser's own crypto implementation where one exists, so a value can be checked against any other conforming tool.

Further reading

All guides →
ExplainerWhat Is a UUID (and When to Use It)?A UUID is a 128-bit identifier that's unique without any central authority. Here's what it looks like, why it's useful, the versions, and when to use one.ExplainerWhat Is a Hash Function? (MD5, SHA-256)A hash function turns any input into a fixed-size fingerprint. Here's what it does, its key properties, common uses, and which algorithms are safe.ExplainerWhat Is a QR Code?A QR code is a 2D barcode a camera reads to open a link or text. Here's what it is, why it holds so much, its anatomy, and a safety note on scanning.ExplainerWhat Is a JWT (JSON Web Token)?A JWT is a compact, signed token used to carry identity between services. Here's its three parts, how it's used for auth, and its security limits.ExplainerWhat Is a Cron Expression?A cron expression schedules a task to run automatically at set times. Here's what it's for, its five fields, how to read one, and the common gotchas.How-toHow to Create a Strong PasswordLength beats complexity. Here's why a four-word passphrase is strong, why you should never reuse a password, and how a manager makes it effortless.