How to use this tool
- 1Add WebP, JPG or PNG images.
- 2Set the quality (70–80 is a good start for photos).
- 3Compress and compare before and after.
- 4Download the WebP files individually or as a ZIP.
Supported formats
- Input
- WebP, JPG, PNG
- Output
- WebP by default
Features
- Official libwebp encoder compiled to WebAssembly
- Transparency preserved
- Does not depend on your browser’s own WebP support
- Batch processing and ZIP download
Why WebP?
WebP, developed by Google, supports lossy and lossless compression as well as transparency. Google’s published comparisons found lossy WebP files roughly 25–34% smaller than comparable JPEGs; real results vary from image to image. All current major browsers display WebP, which makes it a strong choice for websites.
Consistent encoding in every browser
Not every browser can create WebP files natively. SlimMyFile ships the official libwebp encoder as WebAssembly, so WebP output does not depend on your browser’s own encoder.
Tips for the best results
A quality between 70 and 80 is a strong default for photos. For graphics and screenshots with sharp text, use 85 or higher, or keep PNG.
Your privacy
Files are read and processed by your browser on this device. They are not uploaded, stored or shared, and closing the page discards them. Processing speed and the largest file you can handle depend on your device.
Frequently asked questions
Can every app open WebP files?
All modern browsers can, and most current operating systems and image editors do too. Some older software may not, so keep JPEG when you need maximum compatibility.
Does WebP keep transparency?
Yes. Transparent PNG images converted to WebP keep their transparency.