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.

What do I need to enter?

Just ID Length, Number of IDs to Generate, Alphabet Type and Custom Character Set. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Is NanoID Generator free?

Yes. NanoID Generator on TheToolss is free to use with no signup required for the core workflow.

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

NzabE1VReeB5QjPItZsnk

rPxkFplVUFyjoFXpZYh8y

J8ZCQMFqbysrGVStlCwJh

QJpbbRGyKwt-EY68d_Pic

MlekmZemgQROa9tgf5sWX

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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.
What do I need to enter?: Just ID Length, Number of IDs to Generate, Alphabet Type and Custom Character Set. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.
Is NanoID Generator free?: Yes. NanoID Generator on TheToolss is free to use with no signup required for the core workflow.

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