How do I increase the Font Size on invoices?

We can change the font size of your invoices by editing the sales form, robertclark-hand.

Let me share the steps to increase the font size of the invoice.

1. Click the Gear icon in the upper-right corner and select Custom form styles.
2. Look for the invoice template and click Edit.
3. Got to the Design tab and click on the Select a different font.
4. Change the font size and click Done.

You can also use this link for reference when customizing templates in QuickBooks Online: 

• Customize invoices, estimates, and sales receipts in QuickBooks Online
• Import custom form styles for invoices or estimates

We'll be right here if you have additional queries about it.