Question 1

Is my data sent to any server?

Accepted Answer

No. All IDs are generated entirely in your browser using the Web Crypto API. Nothing leaves your device.

Question 2

What's the difference between UUID v4 and v7?

Accepted Answer

UUID v4 is purely random. UUID v7 encodes a timestamp in the first 48 bits, making it lexicographically sortable by creation time — ideal for database primary keys.

Question 3

What is a ULID?

Accepted Answer

A Universally Unique Lexicographically Sortable Identifier. It encodes a millisecond timestamp + randomness in Crockford Base32, producing 26-character sortable IDs.

Question 4

What is NanoID?

Accepted Answer

A compact, URL-safe unique ID generator. Default length is 21 characters using an alphabet of A-Za-z0-9_-.

Question 5

Are the generated IDs cryptographically secure?

Accepted Answer

Yes. All randomness comes from crypto.getRandomValues(), which is a cryptographically secure random number generator.

UUID / ULID / NanoID Generator

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