Video quality describes how much visual detail a file can show. Higher resolution can look clearer on a large screen, but it usually needs more storage and a stronger connection.
Pick what you need
For a quick look on a small phone screen, a smaller file may be enough. If you plan to view a video on a larger display, try an available higher quality option.
What is available?
The choices depend on the video that was uploaded and the formats Facebook makes available. A downloader cannot add missing detail or promise a high resolution for every post.
Check your space
Before saving a large file, check the free space on your device. If downloading takes too long, try a smaller available option. Always keep a copy only when you are allowed to do so.