See below for a quick reference to quantity and character limits in Campaign Manager 360. At the bottom of this article, you can find a list of the characters Campaign Manager 360 allows in landing page URLs.
Quantity and character limits
This section provides the limits on the number of items that can be created in your Campaign Manager 360 account.
Special characters in landing page URLs
In landing page URLs, Campaign Manager 360 supports English alphanumeric characters in upper and lower case, as well as the following special characters:
Keep in mind that some of these characters have particular meanings in the HTTP protocol, which is why they are okay to use in Campaign Manager 360. If you use unsupported special characters, your ad may may not click through properly, or it may not serve at all.
Requirements for %
Your landing page URL can only include % as part of an official Campaign Manager 360 macro (such as %p or %k).
If you need to use % for any another reason, use an escaped version (%25) I.e., enter %25 instead of %. Otherwise, Campaign Manager 360 will count the URL as invalid and not allow you to save it.
Creative encoding
All creatives uploaded to Campaign Manager 360 must be UTF-8 encoded.