File Extension
The suffix after the dot in a filename that identifies the file type and helps the operating system determine how to handle it.
A file extension is the string of characters following the last dot in a filename, serving as an identifier for the file format. Common image extensions include .jpg, .png, .gif, and .webp. Operating systems and applications use extensions to determine which software should open a given file.
Simply renaming the extension does not convert the file's internal data structure. For example, changing .png to .jpg without proper conversion may result in a corrupted or unreadable file. Use the image conversion tool to properly re-encode between formats.
Key image extensions for the web include JPEG (.jpg/.jpeg), PNG (.png), WebP (.webp), and GIF (.gif). Choosing the right format balances image quality against file size.