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NanoID Generator

Generate NanoID unique identifiers

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About This Tool

NanoID Generator is an online tool that creates secure, short, URL-friendly unique identifiers using cryptographic randomness. It supports customizable length and alphabet, single and batch generation, and one-click copy — all running locally in your browser.

Key Features

Quick Preview

Use Cases

id generator

Frequently Asked Questions

What is the default NanoID length? Can it be customized?

The default length is 21 characters, which is the official NanoID recommendation providing an extremely low collision probability with the standard alphabet. You can freely adjust the ID length between 1 and 256.

How do I customize the ID character set?

Set your desired character set in the Alphabet input field. The default uses a URL-safe 64-character set (uppercase, lowercase, digits, underscore, and hyphen). For example, set 0123456789 for numeric-only IDs.

How low is the NanoID collision probability?

With the default 21-character length and 64-character alphabet, the collision probability is about 1% after generating 1 billion IDs. Increasing the ID length exponentially reduces collision probability — a 36-character length virtually eliminates collisions even at trillions of IDs.

Is my data safe when using this tool?

Absolutely. All ID generation uses the browser's built-in crypto.getRandomValues cryptographic random number generator and runs locally. No information is uploaded to any server.

Can I generate multiple IDs at once?

Yes. Set the batch count (1 to 100) in the batch generation section and click generate to create multiple NanoIDs at once. Batch results support individual copy for each ID.