What Image Format Should You Actually Use for Your Website?

Most people upload whatever format their photo already happens to be in, without a second thought. The format actually affects file size, and file size directly affects how fast your pages load.

The old defaults

JPG has long been the standard for photos — good compression, small files, slight quality loss. PNG is better for graphics with sharp edges or transparency, like logos, but produces noticeably larger files for photos.

The modern option: WebP

WebP typically produces meaningfully smaller files than JPG or PNG at comparable visual quality, and it's now supported by virtually every modern browser. For most website images, it's the better default.

Why the file size actually matters

Large, unoptimized images are one of the most common reasons a site feels slow, tying directly back to overall site speed. Switching formats alone, with no other changes, can meaningfully cut load times on image-heavy pages.

The practical takeaway

You don't need to become an image compression expert. The short version: use WebP where possible, keep PNG for logos and graphics that need transparency, and avoid uploading huge, uncompressed camera-original files straight to a live page.