Generate short ID

Generate a compact random identifier from a chosen URL-safe alphabet.

freeworks offlinenothing uploaded
ToolShort ID Generator
Input
Output
—
Put this on your own site

The frame below runs the same code as this page, in the reader's own browser. Nothing is sent to us, and nothing is sent to you.

Pick a dark background and the text and panels follow it, so the frame stays readable on a dark page.

Preview

How it works

Random bytes are mapped to the selected alphabet with rejection sampling when needed to avoid modulo bias. The result is an opaque identifier rather than a sequential counter.

  • A URL-safe alphabet balances copyability and transport.
  • Length is the main collision-resistance control.

Worked example

Default Short ID
Generate an 8-character alphanumeric short ID
Input
											Length: 8
Count: 1
Alphabet: alphanumeric
Output
												U2A5G6L6

When to use this

Share links, test fixtures, and compact UI references generate short IDs.

Edge cases

  • Shortening the ID raises birthday-collision risk.
  • Non-power-of-two alphabets need unbiased sampling.
  • Random IDs do not replace authorization or secrecy.