NanoID vs UUID: Which Random ID Should You Use in 2025?

What Is NanoID?

NanoID is a tiny, secure, URL-friendly unique ID generator for JavaScript. Created by Andrey Sitnik (the creator of PostCSS), it generates IDs like V1StGXR8_Z5jdHi6B-myT — compact, safe for URLs, and cryptographically random.

NanoID vs UUID v4: Key Differences

Property	NanoID (21 chars)	UUID v4 (36 chars)
Length	21 characters	36 characters (with hyphens)
Size	130 bytes (npm)	Varies by library
URL-safe	Yes (default alphabet)	No (contains hyphens)
Randomness	~126 bits	122 bits
Readability	More compact	Standard format with dashes
Interoperability	JS-native	Universal standard
Performance	Slightly faster	Standard

When to Use NanoID

• ✅ URL slugs and short links (no hyphens to deal with).
• ✅ Client-side ID generation in JavaScript/TypeScript apps.
• ✅ When you want shorter IDs without sacrificing security.
• ✅ React state keys, temporary identifiers.

When to Use UUID

• ✅ Database primary keys (most ORMs support UUID natively).
• ✅ Cross-language/cross-platform systems requiring a universal standard.
• ✅ REST APIs where UUID format is expected (RFC 4122).

Generate NanoIDs Online

1. Visit FavorTool NanoID Generator.
2. Customize the size (default 21 characters) and alphabet.
3. Generate single or batch NanoIDs.
4. Copy to clipboard instantly.