Situation A: I had my own banner, but how to convert it into suggested pixel?
In the vendor store setting, store banner is suggested image dimension 625 x 300 pixel.
Here is a helpful website for you to custom your banner’s pixel which named PicResize.
Step 1: Click the 'Browse' to choose your own banner
Step 2: Choose 'Custom Size' and key in '625' for Width & '300' for Height
Step 3: Click the blue button to convert
Step 4: Click to 'View image' and 'Save to Disk'
Situation B: I have no idea with the banner.
Here is a helpful website for you to create your banner which named Photopea.
Step 1: Click on 'New Project'
Step 2: Change Width=625; Height=300; DPI=300
Step 3: Choose a template you preferred to edit
Step 4: Click 'File' > 'Export as' > 'PNG'
Step 5: Save
Step 6: Upload your banner to your store and done it.
I hope this article helps you.
If I can be of assistance, please do not hesitate to contact me.
WhatsApp Miss Yip +60199895206