If you have ever exported a product photo, been told it needs to be "300 DPI", and then watched it look fuzzy on your listing anyway, you are not alone. Image resolution is one of the most misunderstood topics in e-commerce. Sellers obsess over DPI numbers that do absolutely nothing for the web, while ignoring the one measurement that genuinely controls how sharp a photo looks online: pixel dimensions.
This guide clears up the confusion once and for all. By the end, you will know exactly what resolution to use, why the "72 DPI for web" rule is a myth, and how to size images so they stay crisp on every marketplace without bloating your file sizes.
The three terms people keep mixing up
Most resolution arguments happen because three different things get lumped together. Here is what each one actually means.
Pixel dimensions
This is the real measurement that matters for online selling. It is simply the width and height of an image in pixels, for example 2000 x 2000. A pixel is a single dot of colour, and the number of pixels determines how much detail an image can hold. More pixels means more detail and a sharper photo when a shopper zooms in.
PPI (pixels per inch)
PPI describes how many pixels are packed into one inch on a screen. It only becomes meaningful when you decide a physical display size. The same 2000-pixel-wide image can be shown at 96 PPI on an old monitor or 460 PPI on a modern phone. The pixels do not change; only how tightly they are squeezed does.
DPI (dots per inch)
DPI is a printing term. It refers to how many ink dots a printer lays down per inch of paper. It is genuinely important when you order printed packaging, flyers or banners, but it has no effect whatsoever on how an image appears in a web browser.
Why the "72 DPI for web" rule is a myth
Here is the single most important fact in this article: web browsers completely ignore the DPI tag stored in an image file. Setting a photo to 72 DPI, 150 DPI or 300 DPI in Photoshop changes nothing about how it displays online or how large the file is. A 2000 x 1500 image is byte-for-byte identical whether it is tagged 72 or 300 DPI.
The "72 DPI" advice is a leftover from 1984, when the original Macintosh screen genuinely showed 72 pixels per inch. That number stopped describing real screens decades ago. Modern displays range from roughly 96 PPI on budget monitors to over 450 PPI on flagship phones. The DPI metadata is just a note attached to the file for print software; your monitor never reads it.
The same logic flips the other way. Being told to make a web image "300 DPI" is equally meaningless unless you also specify a physical print size. For screens, only the pixel count matters. So the next time a tool or a supplier insists on a DPI figure for a web image, you can safely treat it as noise and focus on pixel dimensions instead.
So what resolution should product images actually be?
Forget DPI entirely and think in pixels. The driving factor is the zoom feature. Most marketplaces only switch on hover-zoom or pinch-zoom once your image crosses a pixel threshold, and zoom is one of the strongest conversion tools you have. Shoppers who cannot inspect a product up close are far more likely to hesitate or return it.
Here are the current minimums and recommended sizes across the major platforms.
| Platform | Minimum | Recommended | Notes |
|---|---|---|---|
| Amazon | 1000 x 1000 px | 2000 x 2000 px | Zoom activates at 1000 px but is grainy; product should fill 85% of the frame |
| Shopify | 800 x 800 px | 2048 x 2048 px | Zoom needs more than 800 px; accepts up to 5000 px / 20 MB |
| Etsy | 2000 px on shortest side | 2700 x 2025 px | Higher resolution improves the thumbnail crop |
| Lazada / Shopee | 500 x 500 px | 1000 x 1000 px or higher | 1:1 square; 1000 px keeps detail sharp on mobile |
| eBay | 500 px on longest side | 1600 px on longest side | Zoom and enlarge require 800 px or more |
A safe, simple rule for almost everyone: master your photos at 2000 x 2000 pixels, square (1:1). That single size satisfies the zoom requirement on every major marketplace, leaves room to crop, and looks crisp on high-resolution "retina" phone screens, which effectively double the pixels they show.
Why bigger is not always better
If pixels equal detail, why not upload enormous 8000-pixel files everywhere? Because pixel dimensions also drive file size, and heavy files slow your pages down. A slow-loading product page hurts both your conversion rate and your search ranking, so there is a real cost to going oversized.
Marketplaces also enforce ceilings. Amazon may reject images above 10,000 pixels, and Shopify caps uploads at 5000 pixels and 20 MB. The goal is the sweet spot: enough pixels for sharp zoom, compressed enough to load fast. In practice, a 2000 x 2000 JPEG saved at around 80% quality usually lands between 200 KB and 500 KB, which is the range you want.
Resolution and upscaling: the limit you cannot cheat
One hard rule: you cannot create detail that was never captured. If you photograph a product at 800 pixels and stretch it to 2000, the software simply guesses the missing pixels, and the result looks soft and blurry. This is why starting with a high-resolution camera capture matters far more than any export setting.
Always shoot at the highest resolution your camera or phone allows, then scale down to your target size. Scaling down preserves sharpness; scaling up invents it badly. Modern AI upscalers have improved, but they still cannot match a photo that was captured large in the first place.
A practical workflow for getting resolution right
- Shoot large. Use your camera's highest resolution setting so you have plenty of pixels to work with.
- Edit at full size. Do your retouching, background cleanup and colour correction on the large file.
- Decide one master size. Export a 2000 x 2000 square master that works everywhere.
- Resize per marketplace if needed. Some platforms prefer specific dimensions, so create those variants from the master, never by enlarging a small file.
- Compress before uploading. Aim for the 200 to 500 KB range so pages stay fast.
- Ignore the DPI field. Leave it at whatever the software defaults to. For web, it changes nothing.
Doing this by hand for dozens of products across several marketplaces is tedious, which is exactly the kind of job a batch tool handles in seconds. PixelPrep lets you resize and compress product images to the exact pixel dimensions each platform expects, in bulk, without fiddling with confusing DPI settings or losing quality. You set the pixel size; it does the rest.
Quick reference checklist
- Pixel dimensions are the only resolution measurement that matters for the web.
- DPI is a print term that browsers ignore entirely. The "72 DPI for web" rule is a myth.
- 2000 x 2000 px, square, is a safe master size for every major marketplace.
- Zoom usually needs at least 1000 px (Amazon) or 800 px (Shopify, eBay) to switch on.
- Never upscale a small image to hit a size requirement; shoot large and scale down.
- Target a file size of roughly 200 to 500 KB to keep pages loading quickly.
- Crisp, fast-loading photos that zoom properly can lift conversion rates by 5 to 15%.
Once you stop worrying about DPI and start thinking purely in pixels, image resolution becomes simple. Capture plenty of detail, choose the right pixel dimensions, compress sensibly, and your listings will look sharp and load fast on every platform you sell on.