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Nanoid Generator

Generate short, URL-safe unique IDs with configurable alphabet and length. Includes collision probability calculator, entropy analysis, and batch generation. Uses Web Crypto API for true randomness. Runs entirely in your browser — your data never leaves your machine.

nanoid id generator uuid unique random url-safe

Published May 30, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Generate short, URL-safe unique identifiers similar to Nanoid. Choose from 8 alphabet presets or define your own, configure the length, and generate single or batch IDs with true cryptographic randomness via the Web Crypto API.

Features

  • 8 alphabet presets: URL-safe, hex, lowercase, uppercase, digits, alphanumeric, no-dashes, Base58
  • Configurable length: 1 to 128 characters
  • Batch generation: generate up to 50 IDs at once
  • Collision analysis: birthday-problem probability for 1M IDs
  • Entropy display: bits per character and total entropy
  • Time to collision: estimated time to reach 1% collision probability
  • Cryptographic randomness: uses crypto.getRandomValues()
  • 5 examples: common ID generation scenarios
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Generate short unique IDs for database records
  • Create URL-safe tokens for sharing links
  • Generate hex tokens for API keys
  • Create numeric verification codes
  • Compare entropy of different alphabet/length combinations