Direct answer: Use WebP for broad compatibility, AVIF for maximum compression on supported platforms, and JPEG as a safe fallback for older marketplace uploaders.
Product images must load fast, look sharp, and pass each marketplace's file requirements. The format you choose affects all three. Here is a practical comparison based on real marketplace uploads rather than synthetic benchmarks.
JPEG: The Universal Baseline
Every marketplace accepts JPEG. It is the safe default when you are not sure what the upload form expects. At quality 85 and sRGB color space, a 1600x1600 product photo lands around 150–250 KB. The downside is that JPEG does not support transparency, so you cannot use it for images that need a clean cutout on a white background — you must bake the white into the pixels.
WebP: The Best Default for 2026
WebP produces files 25–35% smaller than JPEG at equivalent visual quality. It supports transparency, which means you can ship a single file with a transparent background and the marketplace renderer composites it onto white. Amazon, Shopify, and Etsy all accept WebP uploads as of 2026. eBay's uploader still prefers JPEG in some edge cases, so keep a JPEG fallback ready.
AVIF: Maximum Compression, Narrower Support
AVIF achieves 40–50% smaller files than JPEG at the same perceptual quality. The tradeoff is encoding speed — AVIF encoding is 3–5x slower than WebP — and marketplace support. Amazon accepts AVIF for A+ Content images. Other platforms are still catching up. Use AVIF when file size is the top priority and you have confirmed the target platform accepts it.
Practical Recommendation
Start with WebP at quality 80 for your primary listing images. Keep a JPEG copy at quality 85 for platforms that do not accept WebP. Use AVIF only for platforms that explicitly support it and when you need the smallest possible file. PicTools handles all three formats and lets you export each listing in the optimal format per marketplace. Try it at https://getpictools.com — sapsap@qq.com.
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