NanoID Generator

NanoID is a compact, URL-safe, cryptographically secure unique identifier generator. Created as a modern alternative to UUID, NanoID uses a larger alphabet (A-Za-z0-9_- by default, 64 characters) instead of hexadecimal, allowing it to achieve the same collision resistance as UUID v4 with significantly shorter strings. A default 21-character NanoID provides about 126 bits of entropy (vs 122 bits for UUID v4), while being 20% shorter.

NanoID is widely used in modern web development for database primary keys, URL shorteners, API keys, session tokens, and distributed system identifiers. It is cryptographically secure (using crypto.getRandomValues in browsers or Node.js), collision-resistant, and supports custom alphabets for different use cases — from pure numeric OTPs to hex color codes. This tool generates NanoIDs entirely in your browser with no server-side processing.

1. Set options — Choose the ID length (1-256), count (1-100), and alphabet preset (URL-safe, alphanumeric, hex, lowercase, uppercase, or numbers-only).
2. Add prefix — Optionally enter a prefix string to prepend to each generated ID (e.g., usr_, tok_, id-).
3. Click Generate — Press Generate to create NanoIDs using cryptographically secure random values.
4. Copy results — Click Copy All to copy all generated IDs to your clipboard at once.