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Clear answers to everyday image, upload and calculation questions—plus thoughtful guidance for people selling online. Original examples you can actually use.
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12 useful guides
01How to compress product images without making them blurry
Smaller files are useful. Missing texture, unreadable labels and muddy colors are not. Here is how to balance both.
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02Calculate your real profit per order—not just your markup
Revenue is what the buyer pays. Profit is what you get to keep after a much longer list of costs.
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03JPG vs PNG vs WebP: a seller’s practical image guide
The best image format is the one that keeps the important detail and works where your customer will see it.
Read the guide04Is your discount actually profitable? Work it out before the sale
A 20% sale can do much more than reduce your revenue by 20%. Check the remaining profit first.
Read the guide05A simple phone photography setup for better product listings
Good product photos come from a repeatable setup more often than from expensive equipment.
Read the guide06The product listing preflight checklist: 12 things to check
Before you hit publish, run through a short list that can prevent expensive surprises later.
Read the guide07How to compress an image to 100 KB or 200 KB for an online form
A form asks for a smaller photo. Here is how to meet the limit while keeping the face, text and edges clear.
Read the guide08How to resize a photo in pixels without stretching or blurring it
A photo can fit the exact pixel limit without looking squashed. The trick is to protect its proportions.
Read the guide09How to convert PNG to JPG, JPG to PNG or WebP correctly
Converting a file is more than changing its name. Choose the format that your destination can actually open.
Read the guide10Photo upload failed? Fix file size, format and dimension errors
“Invalid image” does not tell you much. Find out which rule failed before editing the file again.
Read the guide11How to calculate a discount percentage and final price
Know the final price and how much you save before you buy—or before you announce a sale.
Read the guide12How to crop a photo to square, portrait or landscape
An image can have the right shape without looking squeezed or losing the details that matter.
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Guides are written for independent sellers using original explanations and illustrative examples. See our editorial standards.