The maximum character limit for single-line and multi-line text depends on how the value is input.
- If the value is entered on a contact property, the character limit for both field types is up to and including 65,536 characters.
- If the value is submitted through a Form, there is no imposed character limit.
If you use the HubSpot-Salesforce integration, please keep in mind that some Salesforce properties do have more strict character limits. This means that long values syncing from HubSpot to Salesforce may get truncated, or such values may present syncing errors.