🍋 Generator Tools
Short ID Generator
Generate nanoid-style short unique identifiers
chars
words
sentences
lines
Options
Results
Result
About Short ID Generator
Generate compact, URL-safe unique IDs like nanoid. Configurable length, alphabet, and collision probability estimation. Supports URL-safe, hex, alphanumeric, and no-ambiguous character sets.
Step by Step
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Tips
- 21-character nanoid has similar collision resistance to UUID v4
- Use no-ambiguous alphabet (excludes 0O1lI) for human-readable codes
- Shorter IDs (8-12 chars) work for internal use; 21+ for global uniqueness
Frequently Asked Questions
How does this compare to UUID?
A 21-char nanoid with 64-char alphabet has ~126 bits of entropy, similar to UUID v4's 122 bits. But it's 40% shorter (21 vs 36 chars) and URL-safe.
What is collision probability?
The birthday problem calculation. For 21-char URL-safe IDs, you'd need to generate ~1 billion IDs per second for 4 million years for a 1% collision chance.