First confirm the video is Public and still exists. Copy the link again from Share, use the full Facebook URL when possible, and match any displayed error to the checks below.
Steps
Check visibility
Open the link in a private browser window. If Facebook requires login, the link is restricted.
Copy a fresh link
Use Share → Copy link and try the full Facebook address instead of a short redirect.
Match the error
Review Help and troubleshooting for private, unavailable, rate-limit and temporary-platform-change guidance.
Troubleshooting details
If the result says the video is private, test the link in a signed-out browser window. If it says unavailable, confirm the post has not been deleted and is accessible in your region. An fb.watch link may work better after it opens and you copy the resulting full Facebook address. Missing HD is not necessarily an error: F4Facebook cannot create quality that the source does not provide.
Never enter a Facebook username, password, cookie or access token into a downloader. F4Facebook cannot bypass private posts, friends-only visibility, login walls, age controls or regional limitations. For detailed messages, read F4Facebook Help or the responsible-use guide.
Copyright reminder
Only download content you own or have permission to use. Public visibility does not transfer copyright or grant permission to republish a video.
Use the Facebook video downloader