WebP is the format to convert PNGs into when they are going on a website. It keeps the transparency that is often the reason an image is a PNG in the first place, and it produces much smaller files: a photographic PNG commonly shrinks by 70 to 90 percent, and even flat graphics usually lose a good share of their weight. Smaller images mean faster page loads, and image weight is one of the main things page speed tools flag. This page opens with WebP selected, so you drop the PNG files and convert. The quality slider controls the tradeoff. Around 80 to 92 is the usual range for web images; logos and graphics with sharp edges can show faint artifacts at lower settings, so use Compare to check before downloading. WebP is supported by every current browser, including Safari since version 14, so there is rarely a need for a fallback today. It is less welcome outside the browser: some older editors and email clients still cannot open it, so keep the PNG as your master copy. For the smallest files of all, try AVIF in the same converter. For photos see JPG to WebP Converter, and to turn a WebP back into a PNG use WebP 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.