Image Converter - JPG, PNG & WEBP in Your Browser

Image Converter

This image converter switches image files between JPG, PNG, and WEBP formats. Conversion happens entirely inside your browser through the Canvas API, so the file never reaches a server, and the converted image appears as soon as the original loads.

How the conversion works

The tool draws the uploaded image onto a canvas at its original width and height, then re-encodes it into the chosen format with the canvas's built-in toBlob method. JPG and WEBP output use a fixed quality of 90 percent; there is no slider to change it, and PNG output is always lossless. JPG has no channel for transparency, so converting a PNG or WEBP image with a transparent background to JPG fills those areas with solid white before encoding. Converting to PNG or WEBP instead keeps any transparency intact. Only one image is processed at a time, and switching the output format re-converts the same file instantly without a new upload.

Worked examples

A 1200 by 800 pixel PNG product photo exported from a design tool, with a transparent background, is about 850 KB. Converting it to JPG fills the transparent area white and produces a smaller file, since JPEG's lossy compression discards the per-pixel detail that PNG stores losslessly. Converting the same file to WEBP instead keeps the transparency and still comes out smaller than the source PNG, because WEBP compresses more efficiently than PNG at the same fixed 90 percent quality.

A 3000 by 2000 pixel JPG photo straight from a camera, 2.4 MB, converts to WEBP at the same fixed quality and typically ends up smaller than the original JPG; Google's own WebP comparisons put the format around 25 to 34 percent smaller than JPEG at similar visual quality. The download keeps the original file name with a "-converted" suffix, so vacation.jpg becomes vacation-converted.webp, and the source file on your device stays untouched.

Format conversion reference