Free Online ID Generator
Generate unique identifiers: Nano ID (URL-safe), Short ID, and custom format IDs. Cryptographically secure, bulk generation up to 5000 IDs.
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Key Features
Multiple ID Types
Generate Nano ID, Short ID, or fully custom character set identifiers.
Fast Processing
Generate unique IDs instantly using cryptographically secure random values.
Fully Customizable
Custom length, character sets, prefix/suffix, and multiple output formats.
Privacy Protected
All ID generation happens locally in your browser. No data is transmitted.
Frequently Asked Questions
Getting Started
Nano ID vs UUID v4 — which should I use?
UUID v4 uses 122 bits of randomness, Nano ID at 21 chars provides ~126 bits of entropy. Nano ID is more compact (21 vs 36 chars). Choose Nano ID for new projects; UUID v4 when integrating with existing systems.
How short can I make an ID before collisions become a risk?
At length 8 with 62-char alphanumeric set, 1 million IDs have ~0.01% collision probability. At length 6, 100K IDs jump to ~0.2%. The tool's collision warning flags risky configurations.
Can I generate numeric-only IDs like OTP codes?
Yes. In Custom mode, set charset to "0123456789". Note that collision probability increases with smaller character sets — a 6-digit numeric ID has only 1,000,000 possible values.
Why 5,000 IDs max per batch?
Rendering 5,000+ DOM elements slows the browser. For more IDs, use Download for streaming to disk. The underlying JS function has no batch limit.