On a computer, Instagram doesn't give you a download button for Reels. You can still save a public Reel as an MP4 file with a browser and about 20 seconds.
Public posts onlyNo Instagram login
This works the same on Windows, Mac, Linux and Chromebook, without an extension, software or an Instagram sign-in.
It's handy if you edit videos or want to archive your own Reels.
Steps
1
Open the Reel on instagram.com in your browser.
2
Copy the URL from the address bar. It looks like instagram.com/reel/...
3
Open instagramfetch.com in a new tab, or use the paste box on this page.
4
Paste the link with Ctrl+V (Cmd+V on Mac).
5
Click Download.
6
Click Download MP4 on the result. If the video opens in a new tab, right-click it and choose Save video as.