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NanoID Generator
Generate secure NanoIDs with customizable length and alphabet. Great for developers needing short unique IDs and entropy-friendly defaults.
How to use this tool
- Choose ID length, optional custom alphabet, and batch count.
- Optionally provide a seed for deterministic generation, then review generated IDs.
- Copy IDs or export TXT/CSV/JSON reports with entropy and collision estimates.
Why NanoID works well
- Default alphabet produces URL-safe identifiers with strong entropy density.
- Longer IDs drastically reduce collision risk across high-volume systems.
- Custom alphabets help satisfy platform constraints on allowed characters.
Implementation tips
- Use deterministic seed mode only for reproducible test fixtures.
- Prefer random mode for production identifiers and public tokens.
- Avoid manual edits to generated IDs to preserve expected uniqueness guarantees.
FAQ
- What length should I use?
- 21 is a solid default for most use cases; increase length for very large-scale ID generation.
- What does collision risk represent?
- It estimates same-batch collision probability based on alphabet size, ID length, and count.
- Is generation local?
- Yes. IDs and reports are generated entirely in your browser.
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