Why this tool is useful
Use Nano IDs for compact client-side examples, fixture keys and application identifiers when you need an unbiased configurable alphabet rather than a timestamp-bearing value.
Developer & Data · runs locally
Secure Nano ID Generator
Create uniformly sampled Nano IDs with a URL-safe default alphabet or a custom alphabet, configurable length and cryptographically strong browser randomness.
Ready. Your working data stays in this browser.
How it works
The browser obtains unsigned bytes from Web Crypto and uses rejection sampling, not modulo reduction, so every accepted alphabet symbol has the same probability.
Practical example
The default settings create five independent 21-character IDs from the 64-symbol URL-safe alphabet; a custom alphabet can contain between 2 and 255 unique symbols.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.