Direct answer: Use JPEG for photographs and complex gradients, WebP for the best balance of quality and file size on modern platforms, AVIF when the marketplace supports it and you need maximum compression, and PNG only for graphics that require transparency.
Picking the right image format is one of the easiest wins for page speed and conversion. Yet most sellers upload whatever their camera or design tool exports, usually a large JPEG or a PNG that should have been WebP. Each marketplace has different format support, size limits, and rendering behavior. Understanding the tradeoffs helps you ship lighter pages without sacrificing visual quality.
When to Use JPEG
JPEG remains the safest choice for product photography. Every marketplace accepts it, and the compression algorithm handles continuous-tone images well. Use quality 85-90 for the best balance. Below 80, you start seeing blocking artifacts in gradients and shadows. Above 95, file sizes grow without visible improvement. For a typical white-background product shot at 2000x2000 pixels, quality 85 JPEG lands around 200-400 KB.
When to Use WebP
WebP delivers 25-35% smaller files than JPEG at the same visual quality. Amazon, Shopify, and most modern platforms now accept WebP. Use it when the marketplace supports it and you want faster page loads. The caveat is that some older systems and email clients still do not render WebP. If you are also using images in email campaigns, keep a JPEG fallback.
When to Use AVIF
AVIF compresses even better than WebP — roughly 50% smaller than JPEG at equivalent quality. However, marketplace support is still limited. Use AVIF for your own storefront or CDN-served images where you control the rendering pipeline. For marketplace uploads, check the platform's accepted formats first.
When to Use PNG
PNG is lossless and supports transparency. Use it for logos, icons, overlay graphics, and any image that needs a transparent background. Do not use PNG for photographs — the files are 5-10x larger than JPEG with no visible quality benefit. For product images with transparent backgrounds, export as PNG for the master file and serve as WebP with transparency on the web.
A Practical Workflow
Start from a high-quality master PNG with transparency. For each marketplace, export the format and size that platform prefers. GetPicTools can batch-convert a single master into JPEG, WebP, and PNG variants at the right dimensions for each destination. Spend five minutes setting up the exports once, then reuse the preset for every new product.
Consistent format choices across your catalog mean faster pages, fewer rejection emails, and a simpler asset pipeline. Available at https://getpictools.com — sapsap@qq.com.
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