JPG to ICO converter
JPG stores no transparency, and that changes the result: the icon comes out with a background square, and the challenge is making that square look intentional. The page opens in ICO mode and brings the two tools for it, the square crop and the rounded corners.
The scale is 256 divided by 800, or 0.32, and the 200 px side strips are dropped.
The radius is the smaller of half the side and the side times the percentage, and here both are 128.
At the 16 size the same setting becomes a 3.2 px radius, proportionally.
6 + 3 x 16 bytes before the three PNGs.
The essentials: favicon.ico (16, 32, 48) for browsers, favicon-32x32.png and 16x16.png, apple-touch-icon.png (180) for iOS, and android-chrome 192/512 for PWAs. This tool generates all of them.
Because JPG has no transparency, and the white background is part of the image. Round the corners to hide the square, or remove the image background and use a PNG.
Not additionally. Each size is stored as a lossless PNG. The artifacts the JPG already had remain, but they usually vanish when shrinking to icon sizes.
You can, with a well-centered face and 50% corners to make a circle. At 16 px the photo becomes a few color blobs, so prefer a tight crop on the face.
No. They are the same format with different extensions, and both are accepted, along with PNG, WebP, AVIF, GIF, BMP and SVG.
Generation happens entirely in your browser. No image is sent to any server.