How to Prepare Product Photos for an Online Store

A catalog only looks professional once every photo looks like part of one family rather than a pile of random shots from different phones. One product by a window, another on the kitchen table, a third against a curtain — and suddenly the store feels like a second-hand stall even though the goods are top tier. Shoppers won't name it, but they'll feel it. Then they'll hit the back button.

The good news is that preparing product photos is largely a repeatable routine: the same dimensions, the same framing, the same background, the same file weight across the whole catalog. Let's look at what specific platforms require, how to bring photos to a common denominator, and how to push the entire folder through in one pass — all in your browser, with no photos uploaded to anyone else's server.

What selling platforms require

Before processing anything, it helps to know which frame you're aiming for. Every marketplace has its own rules — a photo that misses the requirements can be rejected or shown with ugly cropping.

• Amazon. The main image must have a clean white background (technically RGB 255, 255, 255), the product should fill at least 85% of the frame, and the long edge needs at least 1000 px for zoom to kick in. In practice you aim higher — 1600 or 2000 px. A square format is the safest.
• Etsy. Recommends at least 2000 px on the long edge and favors proportions close to square. The background can be more atmospheric than on Amazon, but consistency within the shop matters here too.
• Shopify. Gives you freedom, but recommends a square and files up to around 2048 px. The key is that all products share the same proportions — otherwise the category grid looks visually broken.
• eBay. Requires a minimum of 500 px on the long edge, but 1600 px is what really counts, since that's when zoom works. A square and a bright background are the expected standard.
• Allegro and Wallapop. Allegro rewards square photos on a white background in listing thumbnails and has its own weight limits. Wallapop, more mobile-first, favors sharp, bright, square frames that read well on a small screen.

The conclusion is single: a square, a bright background, a long edge of around 1600–2000 px pleases nearly every platform at once. Prepare your catalog to this shared standard and most marketplaces will accept it without complaint.

Uniform dimensions and consistent framing

The most common beginner sin is a catalog where one photo is vertical, the next horizontal, a third square. On a category list those thumbnails jump around, and the eye instantly catches the mess.

The cure is simple: one target format for the entire catalog. Since most platforms love a square, the most sensible move is to bring every photo to a 1:1 ratio, for example 1600 × 1600 px. That way each thumbnail takes up exactly the same space and the page looks designed rather than assembled from scraps.

The second element is consistent framing — the product should occupy a similar share of the area in every shot, with a similar margin around it. If photos are horizontal or vertical, reaching a square means cropping. That's where cropping to a square helps: set one margin and apply it consistently to every product. It's a technical detail you only notice at the scale of the whole gallery — but that scale is exactly what builds the sense of a brand.

White and uniform backgrounds

The background is often the difference between a "homemade" photo and a store-quality one. A white, uniform background cuts out distractions and lets the buyer focus on the product, and it happens to be a hard requirement on Amazon and welcome everywhere else.

If a product was shot on a cluttered counter or against a room, the fastest fix is to clean the frame by removing the background and dropping in a uniform white. In ImageResizerly this is an AI-based, credit-powered feature — the model recognizes the object's outline and cuts it from its surroundings, leaving the product on a transparent or white background, ready for the catalog. A separate guide on how to remove the background from a photo walks through the whole thing step by step.

A practical rule: if you sell on several platforms, prepare a clean-white version as your base. A white background works everywhere, and when needed you can always drop a different background behind the same cut-out product.

A uniform background also makes repeatability easier: when every photo carries the same white, the catalog gains a consistency you can't get by shooting each product in a different corner of the house.

File weight and loading speed

A sharp, large photo is one thing, but if it weighs five megabytes the store will crawl. A slow page means abandoned carts and a lower position in search results — Google has treated loading speed as a ranking factor for years. Product photos are usually the heaviest element on a page.

The goal is for every photo to be sharp enough to zoom into yet still lightweight. Two levers handle it:

• Compression. Lowering quality to around 80% can cut a file's weight in half with no visible difference. When a platform imposes a hard thumbnail weight limit, compressing to a specific size drops under the target value without guesswork.
• Format conversion. WebP yields noticeably smaller files than JPG at the same quality and is now supported by every major browser. If your store accepts it, switching to WebP is worth it; JPG stays the safe choice where maximum compatibility matters.

A sensible catalog has photos weighing roughly a few dozen to two hundred kilobytes — enough to look great, little enough to load instantly even on a phone with weak signal.

An optional watermark

A watermark in a store is a debatable topic. On your own platform it usually gets in the way — buyers prefer a clean product. But when publishing photos outside your store, on classifieds like Allegro or Wallapop, or on social media, a discreet logo in the corner protects against competitors copying your shots.

If you decide on such a mark, repeatability is the key: the same mark, in the same corner, at the same opacity on every photo. The easiest way is to apply it to the whole catalog at once by adding a watermark. Subtlety is a virtue here — the mark should discourage theft, not hide the goods. More nuance is covered in the guide on how to add a watermark to photos.

Processing the whole catalog in a batch

This is where all the earlier decisions meet in a single move. A store is rarely one photo — it's dozens or hundreds of files that must land in the same frame. Processing them one by one is hours of clicking, plus the risk that the catalog drifts out of line.

The solution is batch processing: you set the target size, format and quality once, and bulk resizing the whole catalog applies those same values to each file in turn and packs the result into a single ZIP archive. The entire product folder flies through one set of settings and comes out unified. The mechanics of that processing, from the ground up, are explained in the guide on how to bulk resize photos.

Keep one thing in mind: a batch works best when it's homogeneous. If you have both horizontal and vertical shots, it's sensible to bring them to shared proportions first and only then run them through common size and compression settings.

Filenames matter

A file named IMG_4821.jpg tells neither you nor the search engine anything. A photo's filename is a small but real SEO factor — red-ceramic-mug-300ml.jpg describes the product and helps it surface in Google Images.

A good convention is simple: lowercase, words separated by hyphens, no accented characters, spaces or random camera numbers. When processing a whole catalog, a naming pattern helps — a prefix with the category, a suffix with the variant, or a counter for variants of the same product.

Why nothing goes to a server

A product catalog is often material you don't want out of your hands before launch — a new collection or photos covered by a manufacturer agreement. In classic online tools you upload these files to someone else's server, where they're processed and stored for an unspecified time.

In ImageResizerly the entire process — resizing, compression, conversion, watermarking — happens locally, in your browser. The photos never leave your device and no copy is made online. For a seller that means speed, with no round-trip upload, and control over your own material before publication. The details are in our privacy policy. The exception is the AI-based background removal, which runs on credits.

A practical step-by-step workflow

The whole catalog can be prepared in one go:

1. Gather every photo into one folder and discard the failed shots.
2. Where the background is cluttered, remove the background and drop in a uniform white — that's the base compatible with most platforms.
3. Bring the shots to shared proportions; if it's a square, crop each photo with the same margin around the product.
4. Open bulk resizing for the whole catalog, set the target size (e.g. 1600 × 1600 px), format (WebP or JPG) and quality around 80%.
5. If the platform imposes a weight limit, check compressing to a specific size to drop under the target value.
6. Optionally apply a discreet watermark if the photos will also go outside your store.
7. Give them a consistent naming pattern and download everything as a ZIP, ready to upload.

Common mistakes

A few traps come up regularly:

• Mixed proportions in the catalog. A blend of verticals, horizontals and squares breaks the category grid. Pick one format and stick to it across the whole store.
• Files too heavy. Uploading camera originals slows the page down and hurts your ranking. Compression and conversion aren't a luxury, they're hygiene.
• Inconsistent backgrounds. Some products on white, some against a room looks sloppy. Unify the background across the whole catalog.
• Upscaling small photos. Stretching a thumbnail to 2000 px won't add detail — the missing pixels simply aren't there. Shoot in high resolution from the start.
• Random filenames. IMG_4821 helps neither SEO nor order. Name photos descriptively, ideally with a pattern.

FAQ

What size should product photos be for an online store?

The safest universal choice is a square with a long edge of 1600–2000 px. It meets the requirements of Amazon, eBay, Etsy, Shopify and Allegro at once, zoom works with it, and files stay light after compression.

Does the background really have to be white?

On Amazon the main image requires pure white and that's non-negotiable. Other platforms are gentler, but a uniform, bright background almost always sells better because it doesn't pull attention from the product.

How do I prepare many product photos at once?

Bring the shots to shared proportions and background, then push the whole folder through bulk resizing with a uniform size, format and quality. You download the result as a single ZIP.

Are my product photos safe during processing?

Yes. Resizing, compression, conversion and watermarking all happen in your browser — the files are never sent to any server. Material for a new collection stays with you until launch. The details are in our privacy policy.

What format should product photos be saved in?

If the platform supports WebP, choose it — it gives the smallest files at the same quality. JPG remains the universal choice where maximum compatibility matters. Keep PNG only for cut-out products on a transparent background, before you drop white behind them.