The usual reason to convert a PNG to JPG is size. A photograph saved as PNG can easily be 5 to 10 times larger than the same image as a JPG at a quality setting where nobody would see the difference, and that size is what trips email attachment limits, upload forms and slow page loads. This page opens with JPG as the output; drop the PNG files and convert. Two things change in the process. JPG has no transparency, so any transparent area is filled with a solid colour. White is the default, which suits documents and most web pages, and the colour picker lets you match a dark background instead of getting a white box around a logo. And JPG is lossy, which is ideal for photos but not for screenshots of text, diagrams or line art, where it adds faint smudges around sharp edges. For those images PNG is usually already the right format, or WebP if size is the problem. A quality setting of 85 to 92 is a good default for photos; use the Compare view to check before downloading. To keep transparency and still cut size use PNG to WebP Converter, and the reverse direction is JPG to PNG Converter.
Choosing the right image format for web use has a significant impact on file size and quality. JPEG (Joint Photographic Experts Group) uses lossy compression optimized for photographs: it discards subtle color gradients in ways the human eye does not easily notice, achieving compression ratios of 10:1 to 20:1 at acceptable quality. PNG (Portable Network Graphics) uses lossless compression and supports full transparency (alpha channel), making it ideal for logos, icons, screenshots, and images with sharp edges or text. WebP is Google's modern format that achieves better compression than both JPEG and PNG at equivalent quality: typically 25 to 35 percent smaller than JPEG at the same quality setting, and 26 percent smaller than PNG for lossless images. WebP also supports transparency like PNG. GIF (Graphics Interchange Format) is the oldest format still in use, primarily kept alive by its support for animation. For still images, GIF is inferior to PNG in both quality and compression, limited to 256 colors per frame. Converting to WebP for web delivery is the most impactful single optimization for image-heavy sites. Browser support for WebP is now essentially universal (Chrome, Firefox, Safari 14+, Edge). For cases where legacy Safari support is required, serving WebP via a picture element with a JPEG fallback provides the best result across all browsers.