PNG vs JPG vs WebP: Choosing the Right Image Format

Every image format is a set of trade-offs between file size, quality, and what kind of image it's good at compressing. Picking the wrong one is one of the most common (and most avoidable) sources of bloated web pages and blurry graphics.

JPG (JPEG): photos and gradients

JPG uses lossy compression tuned for photographic content — smooth gradients, complex color variation, natural detail. It has no transparency support and gets visibly blocky on flat-color graphics or sharp edges (think text or logos), because its compression algorithm is built around discarding detail the human eye is least sensitive to in continuous-tone images, not preserving crisp edges. Use JPG for: photographs, photo-realistic renders, scanned photos.

PNG: graphics, transparency, and screenshots

PNG uses lossless compression — no detail is discarded, ever, which is exactly why a PNG of a photograph is usually far larger than an equivalent JPG. What PNG is genuinely better at: images with flat colors, sharp edges, and text (logos, icons, diagrams, screenshots), and anything that needs a transparent background. If you convert a transparent PNG logo to JPG, you'll lose the transparency entirely — JPG doesn't support an alpha channel, so the transparent areas get filled with a solid background color. Use PNG for: logos, icons, screenshots, diagrams, anything needing transparency.

WebP: the modern middle ground

WebP supports both lossy and lossless compression in a single format, plus transparency — effectively covering what JPG and PNG each do separately, usually at a smaller file size for equivalent visual quality. Its main historical drawback (patchy browser/software support) is largely gone now; all major browsers support it. The remaining reason people avoid it is compatibility with older tools or systems that expect JPG/PNG specifically — some CMSs, older image editors, or print workflows.

A simple decision rule

• Photo, no transparency needed, going on the web: JPG (or WebP if your platform supports it) at 75-85% quality.
• Logo, icon, screenshot, or anything needing a transparent background: PNG (or WebP if supported).
• Serving images on a website where every byte matters: WebP, falling back to JPG/PNG only for compatibility with older systems.
• Archival master copy you might re-edit later: keep a lossless PNG (or the original raw/source file) and only export lossy JPG/WebP copies for actual distribution — once JPG compression discards detail, it's gone for good.

A common mistake

Converting an already-compressed JPG to PNG doesn't recover any lost detail or make it "lossless" retroactively — you just end up with a larger file containing the same JPG artifacts baked in. Format conversion can't add back information a previous lossy step already discarded; it can only avoid discarding more.