Why choose NanoID over a UUID?

NanoID uses a larger character alphabet than hex, packing more entropy per character — this lets it stay meaningfully shorter than a UUID's 36 characters while keeping collision risk negligible, useful anywhere ID length matters, like URL slugs.

What does ULID solve that a random ID doesn't?

Its leading characters encode a timestamp, so IDs sort chronologically as plain strings — useful for database primary keys where insertion order affects index performance, the same underlying problem UUID v7 addresses with a different encoding.

Are NanoID and ULID safe to generate without a central server?

Yes — both are designed for independent, decentralized generation with negligible collision probability, the same design goal as random UUIDs, just with different tradeoffs in length, alphabet, and sortability.

NanoID & ULID Generator

developer100% Client-Side

Generate standard NanoID keys, ULID timestamps, and API tokens.

AES-GCM Encryption / Decryption

Encrypt messages with PBKDF2 key derivation and 256-bit AES-GCM blocks securely inside the browser sandbox.

Key / Passphrase

Raw Text Message

Ciphertext (Base64)

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How to use NanoID & ULID Generator

1Click the regenerate button to generate new values.
2Copy secure NanoID keys, timestamp sortable ULIDs, or random API tokens.

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About NanoID & ULID Generator

NanoID, ULID, and Why UUID Isn't Always the Right Default

UUIDs aren't the only reasonable choice for a unique identifier — NanoID and ULID solve slightly different problems. NanoID generates a short, URL-safe random string using a larger alphabet than hex, so it packs more entropy per character than a UUID, letting it stay shorter (commonly 21 characters) while keeping collision probability negligible — useful anywhere a UUID's 36-character length feels wasteful, like a short link slug or a public-facing resource ID.

ULID (Universally Unique Lexicographically sortable Identifier) takes a different approach: it embeds a timestamp in its leading characters, so IDs generated later always sort after IDs generated earlier as plain strings — solving the same database-index-locality problem covered in UUID v7 (see the Complete Guide to UUID), but with ULID's own specific 26-character Crockford Base32 encoding instead of UUID's hyphenated hex format.

Both remain fully random (or time-ordered) identifiers suitable for distributed generation with no central coordinator — the choice between NanoID, ULID, and UUID comes down to which specific property (compactness, sortability, or maximum ecosystem compatibility) matters most for a given use case.

Frequently Asked Questions

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