JPEG vs PNG vs WebP: Which Image Format Should You Use?

JPEG has been the default format for photographs for decades, and for good reason. It uses lossy compression, meaning it discards image detail that the human eye barely notices in exchange for dramatically smaller files. For a photograph with smooth gradients and complex colour — a landscape, a portrait, a product shot — JPEG delivers excellent quality at a fraction of the size of an uncompressed image.

The trade-off is that JPEG struggles with sharp edges, text, and flat areas of solid colour, where its compression can introduce visible artefacts. It also does not support transparency. As a rule, if the image is a photograph and does not need a transparent background, JPEG is a safe and efficient choice.

PNG uses lossless compression, so it preserves every pixel exactly. This makes it the right choice for images where crispness matters: logos, icons, screenshots, diagrams, and any graphic containing text. Unlike JPEG, PNG also supports transparency, which is essential for logos that need to sit on different coloured backgrounds.

The downside is file size. Because PNG never throws away data, a photograph saved as PNG can be several times larger than the same image as JPEG. Use PNG when you need transparency or pixel-perfect sharpness, but avoid it for large photographs where that precision is wasted and the file bloat hurts your page speed.

WebP is a newer format designed to combine the best of both worlds. It supports both lossy and lossless compression as well as transparency, and it typically produces files 25 to 35 percent smaller than an equivalent JPEG or PNG at the same visual quality. For a website, that reduction translates directly into faster loading and lower bandwidth costs.

WebP is now supported by every major browser, so for web use it is often the best default choice. The main caveat is compatibility with older software and some social platforms, so it is worth keeping a JPEG or PNG version on hand for contexts that do not yet accept WebP. For your own website, though, serving WebP is one of the easiest performance wins available.

If you want a quick rule of thumb: use JPEG for photographs, PNG when you need transparency or sharp text and graphics, and WebP when you control the website and want the smallest files with the best quality. Whichever format you choose, compressing the image before you publish it will shrink the file further without a visible loss in quality — and faster pages keep both your visitors and search engines happy.