JPG vs PNG vs WebP: Which Image Format Should You Use?
October 8, 2026 · JoliTools
Pick the wrong image format and you either get a blurry mess or a file ten times larger than it needs to be. Pick the right one and your images look sharp while loading fast. The choice usually comes down to three formats: JPG, PNG, and WebP. Here is exactly when to use each.
JPG: the photograph workhorse
JPG (or JPEG) is the default format for photographs, and for good reason. It uses lossy compression that is extremely efficient for complex, colorful images like photos. A typical phone photo saved as a high-quality JPG might be 2 to 3 MB; the same photo as a PNG could be 8 to 12 MB with no visible improvement.
Use JPG when you are dealing with photographs, realistic images, or anything with smooth color gradients. Do not use JPG for images with sharp text, logos, or line art: the lossy compression creates fuzzy halos around hard edges that look terrible. And never use JPG when you need transparency, because JPG does not support it at all.
PNG: sharp graphics and transparency
PNG uses lossless compression, which means zero quality loss no matter how many times you save it. That makes it perfect for screenshots, logos, icons, charts, and any image with text. It also supports full transparency, including smooth semi-transparent edges.
The downside is file size. For photographs, PNG files are dramatically larger than JPGs, often 3 to 5 times larger, with no visual benefit. So the rule is simple: PNG for graphics, never for photos. If you have ever wondered why a simple screenshot is 4 MB, it is probably a PNG of photographic content that should have been a JPG.
WebP: the modern best-of-both
WebP was designed to replace both JPG and PNG for web use. It does lossy compression like JPG but roughly 25 to 35 percent more efficiently, and it does lossless compression like PNG, plus transparency and even animation. In practice, converting a JPG to WebP at similar quality shrinks it by about a third.
Browser support is no longer a concern: every modern browser has supported WebP for years. The only reason to avoid it is if you need maximum compatibility with very old software, or if you are sending images to someone and are not sure what they use. For anything displayed on the web, WebP is now the sensible default.
Side-by-side comparison
Take a typical 2400-pixel landscape photo. As a PNG, it might be 9 MB. As a JPG at 80 percent quality, around 700 KB. As a WebP at equivalent quality, roughly 450 KB. Same photo, same visual quality, twenty times smaller. That is the power of choosing the right format, and it is why format choice matters more than fine-tuning compression settings.
For a logo with transparency, the math flips: PNG might be 120 KB, WebP lossless around 80 KB, and JPG is not an option at all since it cannot do transparency. Match the format to the content and you win either way.
How to convert between formats
Converting is straightforward and you do not need desktop software. If you have PNG photos eating up space, convert them to JPG or WebP. If you need a WebP for the web, convert from your JPG original, not from an already-compressed copy. The free image converter handles JPG, PNG, and WebP conversions entirely in your browser: your files never get uploaded anywhere.
After converting, run the result through the image compressor to dial in the quality setting. Converting plus compressing is the one-two punch that produces the smallest good-looking files.
Quick decision cheat sheet
Photograph for the web? WebP, falling back to JPG if you need old-software compatibility. Logo, icon, or screenshot with text? PNG, or WebP lossless if file size matters. Image with transparency? PNG or WebP, never JPG. Animated image? WebP or GIF depending on support needs. Print work? Ignore all of this and ask your print shop, since print has completely different requirements.
When in doubt, remember the hierarchy for web use: WebP first, JPG for photos when WebP is not an option, PNG only for sharp graphics and transparency. Follow that and you will never go wrong. Need to convert something right now? The image converter is free and takes seconds.