Generate compact, URL-safe unique IDs with NanoID algorithm. Configure alphabet, length, and collision probability display.
NanoID Generator creates a compact identifier using the chosen character alphabet and exact character length. Each generated value contains only characters from that alphabet, so the default URL-safe set is convenient for paths, query values, database keys, and similar text fields. The collision display helps compare configurations because a larger alphabet or longer ID creates more possible values. The common surprise is that NanoID uniqueness is statistical, not guaranteed: two independent generations can match, even when the estimated chance is extremely small.
The alphabet defines every character that may appear in the NanoID. For a requested length L, the result contains exactly L selections from that alphabet. If the alphabet has s distinct characters, the configuration can represent s^L different strings. Increasing length expands this space exponentially, while removing characters reduces it.
Collision risk depends on both the available identifier space and the number of IDs generated within it. As the population grows, the number of possible pairs grows quickly. Treat the displayed probability as an estimate based on random, independent generation. It does not examine previously issued IDs or prove that a duplicate is absent.
No. NanoIDs are random identifiers drawn from a finite set, so duplication remains possible. Lengthening the ID or enlarging its distinct alphabet increases the available space and lowers collision risk for a given population. For database keys, pair the generator with a unique constraint and retry generation if insertion reports a conflict.
Not automatically. An ID's visible length and alphabet describe its possible value space, but they do not establish how securely it was generated, stored, transmitted, or checked. The collision estimate measures duplicate risk, not resistance to guessing or token theft. Use a security-reviewed token workflow when the value grants access.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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