What Size Should Product Images Actually Be? (A Straight Answer)

The Rule: Twice the Display Size

Modern phone screens pack roughly twice as many physical pixels into the same space as a standard display. If your product image displays in a 600-pixel-wide area, uploading a 600-pixel image means phones stretch it and it looks soft. Uploading at around 1200 pixels wide gives those screens the detail they need. This single principle explains most blurry-image complaints.

Why You Shouldn't Just Upload Everything Huge

The obvious counter-move — upload enormous files and let the browser sort it out — creates a worse problem. A 4MB camera file downloads in full on every visit unless your site is specifically built to resize and serve appropriate versions. On a phone over cellular data, that's the difference between a fast page and an abandoned one.

Target File Sizes

As a working rule: product images comfortably under 1MB, and ideally in the low hundreds of kilobytes. Hero and banner images can be slightly larger given their prominence, but the same principle applies. If your product photos are measured in megabytes, that's the first thing to fix — and it's usually the largest single speed improvement available to an e-commerce store.

• — Upload at roughly 2x the largest display dimension
• — Target well under 1MB per product image
• — Use WebP or another modern format where supported
• — Keep dimensions consistent across the catalogue
• — Compress deliberately rather than accepting camera defaults

Format Matters More Than People Realise

Modern formats such as WebP achieve equivalent visual quality at meaningfully smaller file sizes than older JPEG or PNG files. Most platforms and browsers support them now. If your store is still serving original JPEGs straight from a camera, converting the catalogue is a straightforward change with a measurable speed benefit.

Consistency Is the Underrated Part

Varying image dimensions across a catalogue produces uneven category grids, inconsistent cropping, and a store that looks less professional than the products deserve. Deciding a standard aspect ratio and dimension for all product images — and sticking to it — improves perceived quality as much as any individual image's resolution does.

The Part That Isn't Your Job

Serving different sizes to different devices is a build responsibility, not an upload responsibility. A properly built store handles responsive image delivery automatically — phones get smaller files, desktops get larger ones, from the same upload. If your site doesn't do this, no amount of careful uploading fully solves the problem.

Getting Image Delivery Right — With Devrex Digital

Devrex Digital builds stores with automatic responsive image handling and modern format conversion, so you upload once and every device receives an appropriately sized file. If your product photography looks soft on phones or your pages load slowly, image handling is usually where both problems originate.