Add your files
Drop one JPG or two hundred. Batch conversion is not a paid feature here.
Someone has a logo as a JPEG and needs an icon file for a website or a shortcut.
The JPEG is decoded, resampled to icon sizes and packed into an ICO container.
A JPEG has no transparency, so the icon arrives as a square tile with the JPEG's background baked in. On a dark taskbar or a dark browser tab that white square is very visible. Start from a PNG with a real alpha channel if you can.
Not reliably. Making white transparent also punches holes in every white area inside the logo, and JPEG's edge artefacts leave a grey fringe behind.
256 pixels square, so the largest icon slot can be filled without upscaling.
Drop one JPG or two hundred. Batch conversion is not a paid feature here.
ICO File is lossless, so nothing is thrown away in the conversion.
Converted and deleted the moment it finishes. Never written to permanent storage.