An image compressor reduces the amount of data stored in an image file, which can make the file smaller and easier to upload, share, or store. Depending on the compression method, some image information may be removed while trying to maintain acceptable visual quality. Compression is particularly useful for website images because smaller files can require less data to transfer. If a photo also has very large dimensions, resizing it before compression can further reduce the file size. It is always a good idea to keep the original image before compressing it.