Adding signatures to checks is a great functionality, dully.
Right now, this option is only available in QuickBooks Desktop. The online version uses a preprinted voucher that needs to be formatted for QuickBooks. However, adding a signature is unavailable.
As a workaround, I recommend affixing the signature manually to all checks after printing them.
Alternatively, you can integrate a supported e-signature third-party application. I'll show you how to find one:
- Go to Apps and then select Finds Apps.
- Type esignature in the Search for an app field.

- Once you have found one, click Get App Now.

In addition, I've added these articles that'll help you find out what forms and supplies are available and what shipping options we offer in QuickBooks Online:
I'm still all ears if you need further assistance with your checks and othe expense transactions. Just add your reply below, and I'll circle back to help you.