JPEG vs PNG vs WebP: Which Image Format to Use

Match the format to the image. JPEG is built for photographs — smooth gradients of color where its lossy compression discards detail your eye won't miss, producing small files. PNG is built for graphics with flat colors, sharp edges, and text — logos, screenshots, diagrams — which it stores losslessly, keeping edges crisp, and it supports transparency. WebP does both jobs, usually at a smaller size than either, which is why it's become the modern default for the web.

Use the wrong tool and you'll see it. A screenshot of text saved as JPEG gets fuzzy, ringing artifacts around every letter, because lossy compression hates hard edges. A photograph saved as PNG looks perfect but the file balloons to several times a JPEG's size, because lossless can't exploit the redundancy JPEG throws away. The format isn't cosmetic — it's chosen to fit the kind of image you have.

Two features force the choice. Transparency: JPEG has none — an image with a see-through background must be PNG or WebP, or the transparent areas fill with a solid color (usually white). Sharp edges and text: PNG and WebP keep them clean; JPEG smears them. So a logo that needs to sit on any background is PNG or WebP, full stop, while a full-bleed photo hero is JPEG or WebP.

For the lossy formats, the quality slider is where the size lives. JPEG and lossy WebP let you trade visual fidelity for file size, and the sweet spot for photos is usually around 75–85% — high enough that artifacts are invisible, low enough to cut the file dramatically. Below ~60% you start seeing blocky artifacts in skies and gradients. There's rarely a reason to save at 100%; the last few percent add a lot of bytes for detail nobody can see.

WebP typically produces files 25–35% smaller than a comparable-quality JPEG, and smaller than PNG for the same lossless graphic, while supporting transparency and even animation. For anything going on the web, that size saving translates directly into faster page loads, and every current major browser supports it. If your only question is 'what should I use on my website,' WebP is the safe answer most of the time.

The exceptions are about compatibility and workflow. Some older software, email clients, and printing pipelines don't accept WebP, so a JPEG or PNG is the safer hand-off when you're not sure what the recipient supports. And for archival originals you'll edit repeatedly, keep a lossless master (PNG or a camera raw/TIFF) and export lossy copies as needed — re-compressing a lossy file each time slowly degrades it.