Nano ID Generator
Create secure short unique IDs in your browser. Customize length and alphabet, generate in bulk, then copy or download instantly.
Generated IDs
0 IDsCollision Probability (Approx.)
Based on birthday paradox approximation for generated count within one batch.
FAQ
Is this tool secure?
Yes. It uses crypto.getRandomValues in your browser, which is cryptographically strong randomness.
Does data leave my device?
No generation happens server-side. IDs are created entirely in the browser.
What is a good default length?
21 characters with the default Nano ID alphabet is a strong general-purpose default.