Generate KSUID

Generate a 27-character KSUID with an approximate creation-time sort order.

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ToolKSUID Generator
Input
Output
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Preview

How it works

A KSUID stores a custom-epoch four-byte timestamp plus 16 random bytes, then encodes the 20 bytes as base62. The timestamp prefix makes values roughly sortable.

  • The 32-bit timestamp and 128 random bits balance compactness and collisions.
  • Base62 keeps the result URL-friendly.

Worked example

Single KSUID
Generate one K-Sortable Unique Identifier
Input
											1
Output
												3IPMnFOOj9keDZsC1hXTXGUoHyZ

When to use this

Event IDs, microservice resources, and non-sequential database keys use KSUIDs.

Edge cases

  • The custom epoch is not Unix epoch.
  • Same-second IDs sort by random suffix.
  • Base62 is case-sensitive and must not be lowercased.

References