Step 1: Go to Company Settings and open Document PDF Customization.
Step 2: Choose the document tab you want to customize, such as Invoice, Receipt, Quotation, etc.
Step 3: Click “Setup Own Header & Footer Letter Images”, then enable the function.
Upload your header and footer images.
Click Preview to review how the document will look with the customized header and footer applied.
The recommended image size for A4 document: header (1200x200px); footer (1200x150px)
Step 4: Click Save button once you done.