A free bulk PNG to WebP converter
Most converters make you handle images one at a time, add a watermark, or ask you to wait in a queue. This bulk PNG to WebP converter takes up to 100 images at once, PNG and JPG mixed, and converts them in parallel on your own device. There's no sign-up, no daily limit and no watermark.
It also works as a JPG to WebP converter and a JPEG to WebP converter, and it accepts GIF and BMP files too (a GIF becomes a still image from its first frame).
Preview every image before you download
Each converted image appears as a preview with its old size, new size and the percentage saved. Click Compare to open a before-and-after view and drag the slider across the picture, so you can check the quality with your own eyes before you download anything.
Downloading is one click: the Download button on a card saves that WebP file, and Download all saves the whole batch as a single ZIP with the original file names.
PNG to WebP that keeps transparency
WebP supports transparency, and this converter keeps it. Logos, icons and product photos with a transparent background stay transparent, including soft shadows and smooth edges, because the transparency layer is always stored at full quality. The previews sit on a checkerboard so you can see it.
Convert to WebP without losing quality
Choose Lossless when every pixel must stay exactly the same, for example for screenshots, diagrams or images you'll edit again. For photos and most website images, Lossy gives much smaller files that look the same to the eye. A quality of around 82 suits photos; use 90 or higher for logos, screenshots and anything with text.
Quality is where this tool goes further than most. It uses libwebp, the encoder Google makes for the WebP format, with a slower, more thorough compression setting and sharper color conversion that keeps text and thin colored lines crisp.
How much smaller will WebP files be?
Google reports that lossless WebP images are about 26% smaller than PNGs, and that lossy WebP images are 25–34% smaller than comparable JPEGs at the same visual quality. Your results depend on the picture: large photos and PNG screenshots usually shrink a lot, while a small JPG that is already heavily compressed may barely change. If a WebP file comes out larger, the tool tells you, so you can keep the original or lower the quality.
Resize images for the web while converting
Phone and camera photos are often far bigger than a website needs. Pick a longest side such as 1920 or 1280 pixels and every image is scaled down with high-quality smoothing as it's converted. Images are never enlarged, and photos are turned the right way up using their orientation data.
Where you can use WebP
WebP works in all current versions of Chrome, Edge, Firefox and Safari, and WordPress accepts WebP uploads. Smaller images make pages load faster, which helps visitors on mobile data and is one of the signals search engines look at.
WebP vs PNG vs JPG: which should you use?
For images on a website, WebP is usually the best choice: it does what JPG does for photos and what PNG does for graphics with transparency, in smaller files. Keep PNG for files you'll edit again or send to software that doesn't open WebP, and keep JPG when you need to share photos with older apps or printers. A good habit is to keep your originals and publish the WebP copies.
More free image and file converters
Working with vector graphics? Our SVG to PNG converter turns SVG code, files or links into sharp PNGs, and the SVG to JSX converter makes React components from the same files. To go between images and documents, turn photos into a PDF or convert a PDF to PNG or JPG. Developers can also convert JSON to TypeScript interfaces and Zod schemas.
Private by design
Your images never leave your device. They are decoded and converted in your browser tab, and the WebP files are created there too, like all of our free online tools.