Hi there,
Your business brand is so important, and your logo plays a large role in how you want your customers to feel about your business. I know how important it is to be able to customize your logo's look and feel, and QuickBooks Online makes that process simple. I'd be happy to explain how to change the size of your logo, as well as outline the program's limitations.
To customize your logo and change the size, follow these steps:
1. Select the Gear icon on the toolbar.
2. Under Your Company, select Custom Form Styles.
3. Find the template you want to edit, then select Edit under the Action column.
4. Go to the Design tab, then select Make logo edits.
5. Select Show logo, then change the size and placement as you desire. Note: The height and width can’t be changed.
6. Select Done.
Keep in mind that your logo's file size can only be 24-bits or less in bit depth (or colour depth). For more information about how to customize your logo, check out this awesome article: Add, customize, or remove logos on sales forms.
That's all there is to it. I hope this helps you reach your goal. If you have any other questions about this process, our tech support team is always here for you.
Cheers.