What is a UUID v4 used for?

UUIDs are 128-bit unique identifiers used as database primary keys, idempotency keys, session IDs, and filenames. Version 4 is randomly generated, with 122 bits of entropy making collisions practically impossible.

Should I use the generated password directly?

Yes, that's the point — but store it in a password manager rather than reusing it. Longer passwords with mixed character sets resist brute-force attacks exponentially better than short ones.

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Password & UUID Generator

Generate secure passwords and UUID v4 identifiers with browser cryptography.

Entropy Length:

RFC 4122 UUID v4

About this tool

The Password & UUID Generator creates cryptographically secure random passwords and RFC 4122 version 4 UUIDs using the browser's Web Crypto API. Choose password length and character sets, or generate collision-resistant identifiers for database keys and request IDs.

Unlike pseudo-random Math.random() generators, Web Crypto draws from the operating system's entropy pool, making outputs unpredictable and suitable for real secrets. Nothing is stored or transmitted.

How to use

1Set the password length you want (8–128 characters).
2Click Sample Entropy Key to generate a cryptographically random password.
3Click Generate UUID for a random UUID v4.
4Use the copy buttons to grab either value.

Frequently asked questions

Yes. They use crypto.getRandomValues(), the browser's cryptographically secure random number generator backed by OS-level entropy — far stronger than Math.random().

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Password & UUID Generator

Generate secure passwords and UUID v4 identifiers with browser cryptography.

Entropy Length:

RFC 4122 UUID v4

About this tool

Unlike pseudo-random Math.random() generators, Web Crypto draws from the operating system's entropy pool, making outputs unpredictable and suitable for real secrets. Nothing is stored or transmitted.

How to use

1Set the password length you want (8–128 characters).
2Click Sample Entropy Key to generate a cryptographically random password.
3Click Generate UUID for a random UUID v4.
4Use the copy buttons to grab either value.

Frequently asked questions

Yes. They use crypto.getRandomValues(), the browser's cryptographically secure random number generator backed by OS-level entropy — far stronger than Math.random().

View all

Favicon Generator

Turn one image into a multi-size favicon.ico plus PNG icons.

Password & UUID Generator

About this tool

How to use

Frequently asked questions

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Password & UUID Generator

About this tool

How to use

Frequently asked questions

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