Bitly links support a wide variety of characters that can be used to customize the back half of links. There's a limit of 255 characters in a custom back-half.
The following characters are all supported:
- Letters a-z, both uppercase and lowercase
- Numbers 0-9
- Dashes (-)
- Underscores ( _ )
These characters are not supported:
- ` ~ , . < > ; ‘ : “ / \ [ ] ^ { } ( ) = + ! * @ & $ £ ? % # |