Is this Unique ID Generator free?

Yes, it is completely free to use. No registration, login, or payment required.

Are my generated IDs sent to any server?

No. All ID generation happens locally in your browser using the Web Crypto API. No data is uploaded to any server. The tool works offline too.

What's the difference between NanoID and UUID?

NanoID is shorter (21 chars default), faster, and supports custom alphabets. UUID v4 is a standardized 128-bit format (36 chars with hyphens). NanoID is better for short URLs and database keys, while UUID is better for standardized cross-system identification.

Can generated IDs collide?

The probability is astronomically low. With NanoID (21 chars, 64-symbol alphabet), you'd need to generate 1 billion IDs per day for about 180 million years to have a 50% chance of collision. ULID's collision probability is similarly negligible.

Which ID format should I choose?

NanoID: best for short IDs, URLs, API keys. ULID: best for database primary keys, time-sortable data. UUID v4: best for standardized identification across systems. Custom: best for specific format requirements (prefix/suffix, specific characters).

Free Unique ID Generator - NanoID / ULID Online Generator

❓ FAQs

What is NanoID?▼

NanoID is a compact, URL-safe unique identifier format with a default length of 21 characters. Compared to UUID, NanoID is shorter (21 vs 36 chars), faster, and supports custom alphabets. It uses cryptographically secure random number generation for high entropy. It's widely used in modern web applications, database primary keys, short links, and more.

What's the difference between ULID and UUID?▼

ULID (Universally Unique Lexicographically Sortable Identifier) is a sortable unique identifier. The first 10 characters encode a millisecond-precision timestamp, and the last 16 are random. This makes ULIDs sortable by generation time, ideal for database indexes. UUID v4 is purely random and not sortable. ULID is also shorter (26 vs 36 chars) and uses Crockford Base32 encoding for readability.

Is this tool secure? Are my IDs sent to a server?▼

Absolutely. All ID generation happens entirely in your browser using the Web Crypto API (getRandomValues). No data is ever uploaded to any server. The tool works offline too. You can safely use generated IDs in sensitive production environments.

How do I choose the right ID format?▼

Quick guide:
• NanoID: Best for short IDs (URLs, API keys, short links). Default 21 chars is plenty secure.
• ULID: Best for database primary keys, time-sortable data, log IDs.
• UUID v4: Best for standardized unique identification, API design, cross-system data exchange.
• Custom: Best for specific format requirements (prefix/suffix, specific characters/length).

What's the collision probability?▼

For NanoID (21 chars, 64-symbol alphabet): you'd need to generate 1 billion IDs per day for roughly 180 million years to have a 50% chance of a single collision. ULID uses 128 bits of randomness with similarly negligible collision probability. For extra safety, always use unique constraints on database columns.

🔑 Unique ID Generator

❓ FAQs