What is Sqids?

Sqids (pronounced "squids") is an open-source library that lets you generate short unique identifiers from numbers. These IDs are URL-safe, can encode several numbers, and do not contain common profanity words. Read more .

This is what they look like:


Quick encode & decode example:

sqids = Sqids.new
id = sqids.encode([1, 2, 3]) # '86Rf07'
numbers = sqids.decode(id) # [1, 2, 3]

If IDs are too short, you can pad them to a certain length:

sqids = Sqids.new(min_length: 10)
id = sqids.encode([1, 2, 3]) # '86Rf07xd4z'
numbers = sqids.decode(id) # [1, 2, 3]

Create unique IDs by shuffling the alphabet:

sqids = Sqids.new(alphabet: 'k3G7QAe51FCsPW92uEOyq4Bg6Sp8YzVTmnU0liwDdHXLajZrfxNhobJIRcMvKt')
id = sqids.encode([1, 2, 3]) # 'XRKUdQ'
numbers = sqids.decode(id) # [1, 2, 3]

Full documentation is at https://github.com/sqids/sqids-ruby

If you're looking for the original Hashids Ruby, you can find it here: https://github.com/peterhellberg/hashids.rb

Use Cases

The main use of Sqids is purely visual. If you'd like to use IDs instead of numbers in your project, Sqids could be a good choice.

Good For

  • Encoding primary keys If you're using a relational database
  • Saving database lookups By encoding multiple objects
  • Temporary login tokens Profanity-free and URL-safe

Not Good For

  • Sensitive data This is not an encryption library
  • User IDs Can reveal user count if anyone finds out the encoding alphabet


  • ๐Ÿ†” Generate short IDs from non-negative numbers
  • โœ… Easy encoding & decoding
  • ๐Ÿซฃ Auto-generated IDs do not contain common profanity
  • ๐ŸŽฒ Support for custom IDs through shuffled alphabet
  • ๐Ÿฅณ 45 integrations (78% using new design)
  • ๐Ÿ“Œ Every version produces the same IDs
  • ๐Ÿป Small library with a permissive license

Example / Playground