JPG to ICO converter

The JPG (Joint Photographic Experts Group) format is one of the most widely used image formats. It's a lossy compression type file, meaning some of the image data will be lost when saved. This allows for smaller file sizes than other image formats and is defining feature of JPGs. JPGs can be compressed to varying levels as needed, while still preserving enough image data to be suitable for most use cases.

JPGs are widely used outside of images, for example as textures in 3D graphics and as icons or logos on websites. They're also popular for storing digital photographs due to having relatively small file sizes that don't take up too much storage space. The format works with most image editing software, and it supports an impressive range of color depths (up to 16 bits per color) and resolutions.

ICO is a graphics file format used for computer icons. It was created by Microsoft for use with Windows, and most image editors support the creation and saving of this image type. ICO files contain small images and are typically saved in either 16x16 pixel or 32x32 pixel sizes, but larger sizes are also supported.

ICO files use a specific header which contains metadata, followed by an array of bits that represent the pixels. It supports several color depths (typically 1, 4 and 8 bits per pixel) and can include optional transparency and alternative image formats. ICO files can sometimes contain multiple sizes or variations of the same icon, allowing it to be scaled to different sizes while maintaining a consistent appearance.