How to convert PNG to WebP
Choose a valid PNG, adjust the output quality, convert it, compare the source and result sizes, and download the WebP file. Conversion and previews stay inside the current browser tab.
When WebP is a useful target
WebP is useful when the destination accepts it and you want a modern browser-oriented format that can represent photographic content efficiently while retaining transparency support. It can be a good option for mixed web assets where JPEG would remove alpha transparency.
Format support should follow the destination, not only the potential file size. If a downstream editor, marketplace, email system, or older integration explicitly requires PNG or JPEG, converting to WebP can create compatibility work even when the file is smaller.
Choosing a quality value
A value around the default is a practical starting point for lossy WebP output. Lower it for smaller files only after inspecting edges, gradients, small text, and detailed texture. Encoder quality is not a linear measurement of visual fidelity, and identical settings can produce very different byte sizes for different images.
If the PNG is much larger in pixel dimensions than the final display needs, use Resize Image first. If dimensions are already correct and you mainly want to compare compressed JPEG/WebP outputs, try Image Compressor. The image optimization guide explains the order of operations.
Transparency and file-size expectations
Browser WebP output can preserve transparent pixels when the encoder supports the requested format. Inspect transparent edges after conversion, especially around logos and shadows.
WebP is not guaranteed to be smaller than every PNG. Simple flat-color graphics and already optimized inputs can favor PNG. The result panel reports actual size so you can decide based on the generated file instead of a format assumption.
Privacy and limits
The selected image is decoded and rendered inside the current browser tab. MyTool0 does not upload the source file or generated result. Temporary object URLs are used for previews and released as workspace state changes. Inputs are limited to 20 MB, 8,192 pixels per side, and 16 megapixels. Animated PNG inputs are rejected because exporting one WebP still frame would silently discard the animation.
See What browser-local file processing means for the difference between local conversion and ordinary website network requests.