The Canon PIXMA printer offline issue is pretty common. I have seen and fixed it myself hundreds of times on my personal and office printers. But I still remember back in the days when I was new to printers and came across this issue, I used to restart them, remove and replug the cables, and whatnot. A few times it worked. But mostly, it didn’t. Since you’re here on this page, I believe your Canon PIXMA printer is offline too. Therefore, let’s discuss How to fix my Canon PI