PNG is lossless, so a photo or a large illustration stored as PNG keeps every bit of noise and texture, and the file grows accordingly. WebP in its lossy mode discards detail you are unlikely to notice. For photographic PNGs that usually means a much smaller file. For simple icons with a handful of colours, the PNG may already be small, and the WebP may not be much smaller.
Where the savings come from
Transparency is kept
Unlike JPG, WebP has an alpha channel, so logos, cut-out products and icons keep their transparent background. That makes PNG to WebP the right conversion when you want smaller files without a white box around the subject.
One caveat: lossy WebP can soften very sharp edges and fine text slightly. Check logos and screenshots in the preview. If edges matter more than size, keep the PNG.
Settings and output
- Quality: WebP is written at quality 0.9 where the format uses a quality setting. There is no slider on converter pages; use the Image Compressor if you want to choose the quality yourself.
- Size limits: images longer than 4096 px on either side are scaled down to 4096 px. If a converted file would be over 10 MB, it is reduced in steps until it fits.
- Batches: add several files; three are converted at a time. One file downloads directly, two or more come as a ZIP.
- Metadata: EXIF data (camera, date, GPS) and colour profiles are not carried into the new file.
Where the processing happens
Your browser decodes the PNG and encodes the WebP locally. If it cannot encode WebP, the tool shows an error for that file. Nothing is uploaded.
Questions about this tool
Will the WebP look exactly like the PNG?
Close, but not identical. The browser writes lossy WebP at quality 0.9. Photos look the same at normal size; sharp text can soften a little.
I want smaller images for my website but need to keep transparent backgrounds. Which format?
WebP. It keeps transparency like PNG and is usually much smaller for photos and large graphics. Add your PNGs, press Convert Images and download the WebP files.
My small icon barely got smaller. Why?
Simple icons with only a few colours are already compact as PNG, so there is little to save. The biggest savings come from photos and detailed illustrations.
The text in my graphic looks a little soft as WebP. What can I do?
The converter writes lossy WebP, which can soften very sharp edges slightly. If crisp text matters more than file size, keep the PNG for that image.
Can I convert many files at once?
Yes. Add several files and press Convert Images once. Three are converted at the same time. Download All gives you one ZIP file, or you can download each file on its own.