What is the advantage of NanoID over UUID v4?

NanoID is smaller (21 characters vs 36 characters), URL-safe without dashes, and faster while maintaining comparable collision resistance.

NanoID & Unique ID Generator

Generate collision-resistant, URL-friendly unique IDs with custom lengths and character sets.

100% free
Private in browser
No signup
No watermarks

ID Length (Characters)

Number of IDs to Generate

Alphabet Type

Generated NanoIDs

-copyn813Fal2j3dAevne

1isT0aFsSzzexc6ppnl8_

9nuzcAA53oa8ml_reTp_n

o8jl94njapFx25gS-o9en

9eho9xA0x9lS8y-5jTzcd

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About NanoID & Unique ID Generator

Create compact, collision-resistant unique identifiers (NanoIDs) for databases, URLs, and distributed systems. Supports custom alphabets, batch generation, and collision entropy calculation.

How to use NanoID & Unique ID Generator

Choose the desired ID length (default 21 chars).
Select the batch count (how many IDs to generate).
Select the character alphabet (Standard, URL-safe, Alphanumeric, Numbers, or Custom).
Click Generate and copy individual IDs or the entire list.

Key features

Cryptographically secure random generation via WebCrypto API
Custom character alphabet and length support (4 to 128 characters)
Entropy and collision resistance calculation
One-click copy for single IDs or bulk lists
100% client-side

Frequently asked questions

What is the advantage of NanoID over UUID v4?: NanoID is smaller (21 characters vs 36 characters), URL-safe without dashes, and faster while maintaining comparable collision resistance.