Image to WebP Converter in Browser
Convert JPG and PNG images to smaller WebP files locally in your browser with batch download support.
Written by Anil Gautam · Updated
How does this differ from the single-format WebP converters?
This converter accepts any image your browser can decode, so one batch can mix JPG, PNG, GIF, BMP and AVIF files. The quality slider reaches lower, from 20% to 100% with 80% as the default, and files sit in a list with a remove button on each row. Transparency is kept, since WebP supports an alpha channel and no background is added. Decoding and encoding both run in your browser, so the images never leave your device.
At exactly 100%, Chrome and Edge write lossless WebP. Lower values give lossy WebP, and settings near 20% leave visible blur and blockiness in most photos, so check the result before publishing.
Can you change the quality after converting?
Each press of Convert all to WebP encodes every file in the list at the current slider setting, including files that already have a result. After a first pass at 80%, you can move the slider to 60% and press the button again, and every row and the ZIP switch to the 60% versions.
When the browser cannot decode a file, its row shows "Could not convert this image" and the files after it still convert. Download ZIP leaves the failed file out. In Chrome, iPhone HEIC photos are one such file; convert those first with HEIC to JPG Converter.
How do you read the size figures?
Each row shows the original size, the WebP size and the change as a percentage of the original. A negative figure means the WebP came out larger: a 300.0 KB file that converts to 330.0 KB reads (-10% smaller). That can happen at 100%, where lossless encoding takes over, or with small files that were already tightly compressed.
Each row has its own Download button, and Download ZIP appears once at least one file is converted. Converted files keep their names with a .webp extension, so photo.jpeg becomes photo.webp, and Download ZIP always produces webp-conversion.zip, even for a single file. Name clashes matter there: photo.jpg and photo.png both become photo.webp, and the later one replaces the earlier inside the ZIP. Animated GIFs convert to a still image. Pixel dimensions do not change; to cut file size further, shrink the images first with Bulk Image Resizer.