Image Formats Compared: JPG vs PNG vs WebP

JPG uses lossy compression: it throws away fine detail your eyes barely notice to make photographic images much smaller. PNG uses lossless compression: every pixel is preserved exactly. That makes JPG the right choice for photographs (a photo saved as PNG can be three to five times larger than the same photo as JPG), while PNG is the right choice for logos, icons, screenshots, and text graphics, where JPG's compression creates ugly smudges around sharp edges. Only PNG of the two supports transparency, which is why logos with no background are almost always PNG files.

For web delivery, yes, in most cases. WebP was designed by Google to replace both formats: its lossy mode produces files about 25 to 35 percent smaller than JPG at the same visual quality, and its lossless mode produces files about 26 percent smaller than PNG, while also supporting transparency and animation. Every modern browser has supported WebP since Safari 14 arrived in 2020, so compatibility is no longer a real concern for public websites. The honest exception is the editing workflow: JPG and PNG are still easier to open in every desktop app, so keep masters in those formats and export WebP for the site itself.

Yes. WebP supports an alpha channel just like PNG, so a logo or icon with a transparent background can be saved as WebP and come out roughly a quarter smaller than the PNG version with identical transparency. This was the single biggest reason many sites switched: they kept every transparent graphic and shrank all of them at once. JPG cannot do transparency at all, which is why you still see PNG or WebP used for any graphic that has to sit cleanly on different background colors.

Yes, and it does the job far better. An animated WebP supports full color and transparency, while GIF is limited to 256 colors per frame. Animated WebP files typically run about 60 percent smaller than the equivalent GIF, which is why so many sites replaced their animated GIFs years ago. My recommendation: if you have any GIFs larger than a few hundred kilobytes on your site, converting them to animated WebP is one of the highest-value image optimizations you can do. The visual quality usually improves at the same time, since GIF's 256-color limit is what makes animated gradients look banded and ugly.

Use JPG when compatibility with old or unusual software matters more than file size: email attachments, digital photo frames, some print workflows, and uploads to sites that silently recompress everything anyway. JPG is also still the safest choice for sharing photos with non-technical people, because everyone's phone and computer opens JPG without thinking. On your own website, though, serve WebP as the primary format. The 25 to 35 percent savings on every photo adds up fast, especially on image-heavy pages viewed on mobile data.

Keep PNG for anything you will edit again later. Because PNG is lossless, you can open, edit, and resave a PNG a hundred times with zero quality loss, which makes it a good master format for graphics work. It is also the right call for screenshots and interface graphics in documentation, where pixel-perfect sharpness matters. And if a specific platform or tool you use does not accept WebP uploads, PNG is the universal fallback. For the final version served on a website, convert that PNG to WebP once you are done editing.

AVIF compresses even further, roughly 45 to 55 percent smaller than JPG at similar quality, which beats WebP's 25 to 35 percent. The catch is encoding speed and support: AVIF files take noticeably longer to create, and while modern browsers handle them, the broader ecosystem of editors, CMS plugins, and social platforms lags behind WebP. My practical advice for most site owners is to standardize on WebP now and consider AVIF only for a handful of critical images, like a homepage hero, where the extra savings are worth the extra hassle. WebP is the safe default; AVIF is the specialist tool.

Only if you choose lossy settings that are too aggressive, and that is entirely in your control. Lossy WebP at quality 80 to 85 is visually indistinguishable from the original JPG for most photographs while still delivering the typical 25 to 35 percent size reduction. Lossless WebP, by definition, preserves every pixel exactly like PNG. The quality problems people blame on WebP are really problems with over-compression, and they would look just as bad in any lossy format. When converting, compare the result side by side with the original at full size before publishing.

WebP, because Google's ranking systems explicitly reward fast-loading pages and images are usually the heaviest part of a page. Core Web Vitals metrics like Largest Contentful Paint are often decided by how fast the hero image loads, and cutting that image by 30 percent can be the difference between passing and failing. Beyond format, keep doing the basics: resize images to the dimensions actually displayed, use responsive srcset sizes for different screens, write descriptive alt text, and lazy-load images below the fold. Format choice is the biggest single lever, but it works best as part of that full set.

Use a converter that runs locally in your browser so your originals never get uploaded to a server. Our free Image Converter handles JPG, PNG, WebP, and other formats with quality controls, and the Image Compressor shrinks files further if they are still too large after converting. The workflow I recommend: keep your originals in a masters folder, convert copies to WebP for the web, check the visual result, and only then delete or archive the heavier versions. Never convert a lossy JPG to a lossless format expecting quality to return: once detail is thrown away, no format brings it back.