Image size requirements vary between marketplaces and change over time, so treating any single number as universal is a mistake. This guide covers the general resolution and aspect-ratio principles that hold across most platforms, and why you should always confirm current specs directly with each marketplace before a bulk upload.
Higher resolution isn't just about sharpness on a normal view — many marketplaces use zoom-on-hover or pinch-to-zoom features that require a minimum resolution to activate at all. An image that looks fine at thumbnail size but falls short of the zoom threshold silently loses a feature that meaningfully helps conversion, without any visible warning to the seller.
Square (1:1) images remain the safest default across most marketplace grids because they display predictably in search results and category pages without unexpected cropping. Non-square images can work for secondary or lifestyle slots but risk being cropped unpredictably in list views if the platform's grid expects a specific ratio.
JPEG is the standard format for marketplace product photography — it balances file size and quality well for photographic content. PNG is generally reserved for images requiring transparency, which most marketplace main images don't use since they require a solid background anyway. Over-compressing a JPEG to save file size can introduce visible artifacts, especially on flat-color areas like a white background.
Marketplaces periodically update their minimum resolution, aspect ratio, and file size requirements, and specs can differ by category within the same platform. Rather than relying on a fixed number, check the current seller documentation for the specific marketplace and category before a bulk upload — this avoids the common mistake of applying last year's spec sheet to a new catalog.
Zoom features stay functional, supporting better product inspection
Predictable display in search grids with the right aspect ratio
Avoids upload rejections from outdated resolution assumptions
Upload your product photo to Fluxx.work.
Generate images at high resolution suited to marketplace display and zoom features.
Export in the aspect ratio that matches your target platform's grid.
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No — requirements vary by platform and sometimes by category, and they change over time. A high-resolution square JPEG is a safe general starting point, but always verify against the specific platform's current documentation.
Generally yes, up to any maximum file size limit the platform sets — higher resolution supports zoom features and looks sharper on larger displays, as long as the file size stays within accepted limits.
Some platforms recompress uploaded images, which can introduce softness. Starting with a genuinely high-resolution, well-compressed source file minimizes the visible impact of that recompression.
Fluxx.work exports high-resolution images so zoom features and large-display views hold up, without guessing at platform-specific compression behavior.
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