Why public and private matters so much here
Facebook is built around audience selection in a way no other platform in this list is. The same Reel link can show you a video and show a stranger a login wall, depending on choices the poster made. When a download fails here but the video plays perfectly in your own browser, that gap is almost always the reason.
The test takes ten seconds. Open a private or incognito window, paste the link, and see what Facebook shows someone who is not signed in. If it plays, we can fetch it. If you get a login prompt, the audience is restricted and that restriction belongs to the person who posted it.
Quality on Facebook Reels
Vertical 1080x1920 at best, same as Instagram, though Facebook has historically compressed harder than its sibling platforms. A Reel cross posted from Instagram often looks slightly softer on Facebook, because it has been through two rounds of platform encoding rather than one.
If the same Reel exists on both platforms and quality matters to you, the Instagram copy is usually the better source. Our Instagram Reels page covers that side, and the two files are frequently not identical despite looking the same in a feed.
Cross posting and what it does to files
Meta encourages creators to publish a Reel once and distribute it to both Instagram and Facebook. That convenience has a cost: the Facebook version is often a re-encode of the Instagram version rather than a fresh encode of the creator's original export.
You can sometimes see this in fine detail and in fast motion, where the second pass compounds the artefacts from the first. It is not dramatic, but it is real, and it is the reason to prefer the original platform when you have the choice.
Reposting, and why Facebook cares
Facebook calls the practice of re-uploading someone else's video freebooting, and it actively penalises it. Pages that do it lose reach and monetisation, and the detection has got considerably better than it was when the term was coined.
Sharing the original post costs you nothing, keeps the creator's numbers intact, and typically performs better than a re-upload anyway because the algorithm favours original distribution. If you need a copy for a presentation or an archive, that is a different and entirely legitimate use.
Everything above also applies to the rest of Facebook video downloads, and our guide to downloading Facebook video in HD goes further on the parts people get stuck on.
