The best website image format balances appearance, file size, transparency and browser or platform support. One format rarely fits every type of image on a site, so it helps to know what each of the three common formats does well.
When JPEG is a good fit
JPEG is widely supported and often works well for photographs with smooth gradients and many colors. Compression can reduce file size, but repeated or aggressive compression may introduce artifacts around fine edges, text and detailed textures.
When PNG or WebP makes sense
PNG supports transparency and can be useful for logos, interface graphics and cutouts, though its files may be larger. WebP can reduce file size while preserving good visual quality and supports transparency, but the site’s content pipeline should be tested to ensure the files are served correctly.
Build a repeatable export workflow
- Keep a high-quality master file separate from web exports.
- Use transparency only when the design requires it.
- Compare the file visually at its real display size.
- Compress responsibly and test on mobile.
Use consistent export presets and a final visual check to prevent oversized or visibly degraded site images.
Related reading
Continue with our guide to optimizing product images for Shopify stores. For a broader introduction to web images, see web.dev’s Learn Images course. For help with product-ready images, explore our e-commerce product photo editing service.
Frequently asked questions
Is WebP better than JPEG?
WebP files are often smaller at similar quality, but JPEG has the widest support. Use WebP where your platform serves it reliably, and keep JPEG as a fallback if needed.
Can JPEG have a transparent background?
No. JPEG does not support transparency. Use PNG or WebP when you need a see-through background.
Which format loads fastest?
It depends on the image. Photos are usually lightest as JPEG or WebP, while flat graphics and logos can be small as PNG. Resizing to the displayed dimensions helps more than switching formats.
