Question 1

What's the difference between UUID and ULID?

Accepted Answer

UUIDs (Universally Unique Identifiers) are 128-bit identifiers, with UUID v4 being completely random. ULIDs (Universally Unique Lexicographically Sortable Identifiers) are also 128-bit but include a timestamp component, making them sortable by creation time. Use ULIDs when you need time-ordered IDs, UUIDs when order doesn't matter.

Question 2

Which UUID version should I use?

Accepted Answer

UUID v4 (random) is most common for general use — it's simple and has extremely low collision probability. UUID v7 (time-ordered) is newer and recommended for database primary keys as it improves index performance. UUID v1 includes MAC address and timestamp but has privacy concerns.

Question 3

How secure are the generated IDs?

Accepted Answer

Our generators use the Web Crypto API's cryptographically secure random number generator (CSPRNG). This provides the same level of randomness used in cryptographic applications. The IDs are generated entirely in your browser, never transmitted to any server.

Question 4

What is a BIP39 passphrase used for?

Accepted Answer

BIP39 passphrases (mnemonic phrases) are primarily used for cryptocurrency wallet recovery. They convert random entropy into human-readable words. Our generator creates secure passphrases that can also be used as memorable yet secure passwords for other applications.

ID Generators

Available Tools

UUID Generator

ULID Generator

BIP39 Generator

Random String Generator

Frequently Asked Questions

Security & Encryption

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