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UUID Generator

Generate cryptographic UUID v4 identifiers on demand.

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What this tool does

Cryptographically secure UUID v4 generator. Produce one or many, uppercase or lowercase, with or without hyphens. Ideal for databases, temporary files or unique keys.

For short-lived tokens, pair with Base64 encoder. If you want a URL-friendly version of a UUID, run it through slug generator.

What you can use it for

  • Create unique identifiers for database records.
  • Generate random names for temporary files or uploads.
  • Produce short-lived tokens without collisions.
  • Seed UUID columns in test migrations.

How to use it

  1. Set how many UUIDs you want to generate.
  2. Enable uppercase if you need uppercase letters.
  3. Enable without hyphens for the compact 32-character form.
  4. Copy the output or download it as plain text.

Everything runs inside your browser. No file is uploaded to any server. See more tools in this field.

When to use UUID v4 and when not to

UUID v4 is the default choice for identifying records, but it's not always the best one. This quick guide helps you decide.

  • Primary keys in databasesGood option if you want to generate IDs without coordinating with the database. Watch the index: random UUIDs fragment the index more than autoincrement IDs.
  • Session tokensAvoid. For sessions, use signed tokens (JWT) or higher-entropy random bytes. UUID v4 is an identifier, not an authenticator.
  • Temporary file namesIdeal. Zero collisions, easy to read in logs, reveals nothing about the contents.
  • Event or trace IDsPerfect. Each event carries its own UUID and lets you correlate logs across services.
  • Short public URLsBetter not. UUID is long and unreadable. Use nanoid or a short slug if it's meant to be shared.

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Frequently asked questions

What is a UUID v4?

A universally unique 128-bit identifier whose meaningful bits are random. The probability of a collision is so low that it is considered negligible in any real-world system.

Is it safe to use them as tokens?

For opaque identifiers, yes. For session or authentication tokens you should use tokens designed for cryptography (signed tokens, dedicated random bytes). UUID v4 is meant to identify, not necessarily to authenticate.

Why the format with hyphens?

RFC 4122 defines the 8-4-4-4-12 hyphenated layout so the identifier is easier to read. Without hyphens the 32 hex letters are the same identifier, just more compact.

Are they generated locally?

Yes. The tool uses your browser's crypto.randomUUID() API, which is cryptographically secure and works offline. No server call is made.