NanoID Generator
Generate secure, URL-friendly NanoID unique identifiers online. Customize length, alphabet, and calculate collision probability instantly.
What is NanoID?
NanoID is a small, fast, and secure unique string ID generator. It uses cryptographically strong random values and produces compact, URL-friendly identifiers with a default length of 21 characters.
How does NanoID differ from UUID?
NanoID produces shorter IDs (21 characters vs 36 for UUID), uses a URL-safe alphabet without hyphens, and offers a smaller bundle size. It's also more compact while maintaining excellent collision resistance.
Is NanoID cryptographically secure?
Yes, NanoID uses crypto.getRandomValues() or equivalent secure random APIs provided by the browser, ensuring cryptographically strong randomness for ID generation.
What is the default alphabet used by NanoID?
NanoID uses a 64-character alphabet consisting of uppercase letters (A-Z), lowercase letters (a-z), digits (0-9), and the symbols hyphen (-) and underscore (_), making IDs URL-safe.
Can I customize the ID length and alphabet?
Yes, you can fully customize both the length of generated IDs and the alphabet used. This allows you to balance ID size, readability, and collision probability for your specific use case.
What is collision probability and how is it calculated?
Collision probability estimates the chance that two generated IDs will be identical. It depends on the ID length and alphabet size. Our built-in calculator uses the birthday problem formula to estimate this.
Is my data safe when using this generator?
Absolutely. All NanoID generation happens locally in your browser using Web Crypto APIs. No data is sent to any server, ensuring complete privacy and security.
What are common use cases for NanoID?
NanoID is ideal for database primary keys, URL shorteners, session tokens, file names, API keys, and any scenario requiring compact, unique, URL-safe identifiers without coordination between services.
How many IDs can I generate at once?
You can generate multiple IDs in a single batch. The tool supports bulk generation, allowing you to create dozens or hundreds of IDs instantly with consistent settings.
Does NanoID work offline?
Yes, once the page is loaded, all ID generation happens locally in your browser. You don't need an internet connection after the initial page load to generate NanoIDs.
How to Use NanoID Generator
Generate secure, URL-friendly NanoID unique identifiers right in your browser. Adjust the length and alphabet, and check collision probability instantly — nothing is uploaded or logged.
- Set the ID length — 21 characters by default is already enough to make collisions practically impossible.
- Adjust the alphabet if you need a restricted character set, such as lowercase letters and digits only, to keep IDs URL-safe.
- Generate a fresh NanoID and copy it straight to your clipboard for use in your code.
- Watch the collision probability readout to confirm the identifiers are unique enough for your expected volume.
A default 21-character NanoID offers collision resistance on par with UUID v4 while staying shorter and URL-safe.
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