You save a Facebook video, open it, and it looks noticeably worse than it did in the feed. The file is not corrupted and the download did not fail. You were simply given a lower quality version than the one that exists.

Facebook stores several versions of every video

When a video is uploaded, Facebook encodes it at multiple resolutions and serves whichever one suits the viewer's connection and screen. That is standard adaptive streaming and it is why playback rarely stutters.

The consequence for downloading is that there is no single file to grab. There is a set of them, and a tool has to pick. Many paste a link style sites pick whichever stream is easiest to reach, which is often a low resolution one, and present it as the download.

A 360p download is usually not a failure. It is a tool taking the first stream it found instead of the best one available.

Why an extension has an advantage here

An external website only receives the URL you paste. It has to fetch the page itself, without your session, and work out what it can from the outside. Anything requiring you to be logged in is invisible to it.

An extension is already on the page you are watching. It can see the streams the player itself is using, which means it can offer the resolutions actually available to you rather than guessing from the outside.

Getting the best available quality

A few practical habits make a real difference:

  • Let the video start playing first. Higher quality streams are often only requested once playback begins. Downloading from a page where the video has never played can limit what is on offer.
  • Choose the resolution explicitly. If a tool offers 1080p, 720p and audio only, pick rather than accept a default. Defaults tend toward the safe small option.
  • Check the source before blaming the tool. Plenty of Facebook videos were uploaded at 720p or lower, or were re-shared through compression. No downloader can produce detail the upload never contained.
  • Prefer the original post. A re-share of a re-share has usually been recompressed each time. Finding the original post often gains you more quality than any download setting.

Reels and stories behave differently

Reels are vertical and frequently encoded at a lower ceiling than standard feed uploads, so 1080p is not always on the table. Watching a Reel play through once before downloading is the most reliable way to see what is genuinely available.

A note on what you are allowed to save

Worth stating plainly, because tools rarely do. Downloading your own uploads, or content you have permission to use, is straightforward. Redistributing someone else's video, or reposting it as your own, is a copyright issue no matter which tool produced the file. Save things for offline viewing, archiving your own work and legitimate reuse, and check before republishing anything you did not make.

When you only want the sound

If what you actually want is the audio, a music clip, an interview, a voiceover, downloading a full 1080p video and converting it afterwards is the long way round. Pulling the audio directly is faster and avoids a re-encode, which the guide to extracting MP3 from Reels walks through.