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Nano ID Generator
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Generate secure, unique, and URL-friendly identifiers for database IDs, API keys, and more.
Configure options and click "Generate Nano IDs"
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This generator creates one or more strings by choosing characters from an alphabet. Its starting settings are 21 characters, 5 results, and the URL-friendly alphabet A–Z, a–z, 0–9, underscore, and hyphen. You can change the length from 1 to 256, request 1 to 200 strings, and edit the alphabet; the alphabet must contain at least two characters.
The page uses the browser’s cryptographic random-value facility to obtain bytes, then maps each byte to a character in the selected alphabet. The standard Nano ID package also defaults to 21 characters and a URL-friendly alphabet, but this page’s custom mapping is not the package implementation: it uses a byte remainder operation, so arbitrary alphabets may not receive perfectly even character frequencies. Generated strings can collide, especially when you shorten them or generate many.
Technical references
Guide
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Set the number of characters in each string, from 1 to 256. Longer strings provide a larger set of possible combinations when the alphabet is unchanged.
Choose how many strings to generate, from 1 to 200. Review the alphabet and remove any characters your destination system does not accept.
Select Generate, then copy the newline-separated output. Generate again to replace the displayed batch with new values using the current settings.
For example, a digits-only alphabet creates strings containing only numerals. That may simplify manual entry, but it has fewer possible combinations at a given length than the full 64-character default alphabet.
Use cases
See how the tool fits into real work and everyday tasks.
A developer can make sample identifiers for local tests or mock records, then discard them when the test data is reset.
A team can create short labels for draft files or internal prototypes when a collision would be easy to notice and resolve.
For values a person must type, a smaller custom alphabet can omit confusing characters. Increase the length to compensate for the smaller choice set.
Q&A
Find concise answers to common questions and confusing cases.
No. Random strings can collide. Check uniqueness in the system that will store or issue the identifiers, especially for short strings or large batches.
No. The default length and alphabet resemble the package defaults, but the page uses its own byte-to-character mapping and allows custom settings. Use the official package in an application that needs package compatibility.
This page is a general string generator and does not manage credentials, storage, rotation, or access controls. Use a purpose-built credential workflow for secrets that protect accounts or systems.
Notes
Review scope, result limitations, and important precautions before use.
Length and alphabet size determine how many distinct strings are possible, and every generation can duplicate an earlier value. The mapping used for custom alphabets can also favor some characters when the alphabet length does not divide the byte range evenly; repeated alphabet characters add further ambiguity. Do not assume custom settings provide equal probabilities or guaranteed uniqueness. Verify the destination’s character rules and enforce uniqueness where identifiers matter.
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