Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Will these work on canvas paintings?
Document: I got these to hang some paintings I'd done on canvas in my daughter's nursery - they were so easy to use and the paintings were easily hung - with no holes/damage to our newly painted walls!
Medium is my favorite size. I think they are the most versatile size for my general hanging needs. I tend to hang 5x7, 8x10 & 11x14 photos the most, so this size gives me the most bang for my buck.These are easy to install and work great for collage-type projects, as you have the ability to place photos in an exact location. We have used them for things like smoke detectors, canvas art and smaller pictures. So far, they have worked well.
If you read my past glowing reviews about these 3M picture hangers, you know I think they're the bees knees! These handy little strips are used all over my rental home. No holes, and so easy to use. I oil paint as a hobby, so hanging my latest work is a piece of cake, and when I create a new piece, I simply take down the old canvas, put four strips on top of the strips that are already hanging, pull off the backings and hang my new piece.
Currently hanging a piece of canvas art in my house. Easy enough to use and seems strong. I would use this again.
I am an artist and I just used Command strips to hang my first one person show. It was super easy and the paintings are all very staight ad do not get knocked about and crooked. It is more expensive that the old wire and hanger method but the outcome is worth the expense. I have added them to my framing tool kit and am recommending them to all my artist friends. Great product!
It works so far, but I still worry about my canvas print and constantly check it. When I use it according to the instruction, I often remove the strip on the wall, not the one on the painting (one hanging point requires two strips). I just had one picture frame broken partially because of this.
I have never had mine fail! I don't know where all the negative reviews come from- I've used mine to hang up pictures and paintings, framed posters, markerboards, and even random wall decorations (like a boomerang). I have NEVER had anything fall down, except for one board that was just a little too heavy- added one extra strip, and it was all set!
I have a couple of 20" x 20" canvas artwork that I'd like to hang on my dry walls. They didn't come with any hanging options, but I don't like putting holes in my dry wall. So I tried these Command strips. I used 4 strips per canvas (overkill) and they hold up very well.
if you want  broken frames from pictures falling off walls buy this It Does Not Work
These work really well. They are strong, but also don't leave marks on the wall!
Answer: It depends on the type you have, if the canvas is on stretcher, you can attach to the stretcher frame. If it is a wrap I suppose you can attach to the section of the canvas that wraps to the back of the print, but not sure if the canvas texture might cause it not to adhere as tightly as it could. I don't think it will damage the canvas, I know it didn't damage hotel wall paper which is what I used it on when I made use of the strips. Peeled off clean as a whistle and met the standards of the very picky hotel staff.