Different file formats have different compression algorithms and efficiencies. For example, converting from a lossless compression format (such as PNG) to a lossy compression format (such as JPEG), or adjusting the compression rate settings, can result in a significant reduction in file size. Conversely, when converting from a highly compressed format to a less compressed format, the file size may increase.
Different formats are encoded in different ways to store data with different efficiencies. Some formats may be better suited to storing certain types of data, so they can use storage space more efficiently when converting, resulting in a change in file size.
For image and video files, the resolution and quality settings selected when converting directly affect the file size. Increasing the resolution or quality will increase the file size, while lowering these settings will reduce the file size.
On OnlineConvert, since it supports conversion of multiple file formats and allows users to adjust conversion settings, the change in file size will be affected by many of the above factors. Users can control the size of the converted file by selecting the appropriate output format and adjusting the relevant settings.