Round canvas stretchers

We make round, oval, and arched frames and, with our CNC technology, we can produce any unusual shapes you can come up with!

While most shaped frames are made as strainers, we also fabricate true “keyable” oval or round stretcher frames and canvases (and, to our knowledge, are the only company to do so!). All of our shaped supports are designed with a front fall or slope, to keep the canvas from contacting the frame except at the very edge.

We work with some of North America's most talented and ambitious artists, and have made round canvas frames and other shaped stretchers over 19 feet in diameter by laminating plywood sections cut on the CNC machine. Our larger frames always include cross-braces for added support, and we can supply gravity bars for installation of the canvases.

As with all of our products, we guarantee the highest quality materials and craftsmanship.


Keyable Shaped Stretcher Frames - Now more affordable!

Upper Canada Stretchers has changed the way we make our keyable shaped stretchers, making them faster and easier to produce and, thus, more affordable for our clients! Re-stretching existing paintings, tightening an old one, adding tension during the artist’s process - there are myriad advantages to keyable stretchers. Now we can add keys to any shape well-suited to the stretching process.

Contact us for a quote and to discuss how we can help with your next shaped art piece!

Keyable Oval Stretcher Frame from Upper Canada Stretchers

Keyable Oval Stretcher from Upper Canada Stretchers


Our round and oval strainer frames typically come in two thicknesses: 3/4″ and 1-1/2″. (Note that strainer frames are NOT keyable.)

 Frame Diameter

 Bar Width  3/4" thick (Birch)  1-1/2" thick (Birch + Fir)
 12"  2.5  $66.41 N/A
 18"  2.5  $94.28  $122.57
 24"  2.5  $125.71  $163.43
 30"  3.5  $157.14  $204.28
 36"  3.5  N/A  $245.14
 42" (1x1 bracing)  4.5  N/A  $286.00


Order your standard-sized Round Strainer Frames now


We can make round strainer frames (not keyable) in any size you want but our “standard” sizes offer the most economical option. If you would like a quote on a custom-sized strainer or stretcher frame, please call us at 1-800-561-4944 or email us so we can go over the details of your project. We specialize in custom shapes, small and large, in both 2D and 3D – so we are happy and confident to tackle any unusual idea you may come up with!


3/4" thick round, oval, arched canvas frame

3/4″ strainers are made from a single layer of Baltic birch plywood and are available up to 36″. (Note that 1/4″ [6mm] staples or an air nailer must be used on the birch to ensure the staples pull in tightly).

1-1/2″ strainer with laminated fir plywood

Larger frames are made to be 1-1/2″ by adding an additional layer of fir plywood laminated to the back. This both adds greater stability and is also easier to staple into than the birch. (Staples longer than 1/4″ [6mm] may be used on the fir.)

Round Oval Canvas Stretcher Frame

Round and oval frames 40″ and larger have integrated bracing and those over 48″ are also made in sections that bolt together for easier manufacturing and shipping.

Round Stretcher Bracing Sections

Frames over 48" are made in shaped sections of laminated plywood and are fastened together with flush-joint connector bolts. This makes it possible to easily disassemble the frame for moving and shipping. We can also supply gravity bars with the frames, providing a simple way to install the canvas on the wall.

6ft Round Canvas Frame

When using shaped frames, we recommend that unprimed cotton or linen canvas be stretched first and then primed. The unprimed canvas is more flexible and can be pulled tight around curved edges without creating folds in the canvas. The photo above shows a round canvas stretched on a 60” diameter frame. The visible edge is free of any folds but the folds are quite pronounced on the back side of the frame. The thicker the frame, the more difficult it is to avoid folds in the canvas along the edges. For this reason, we try to keep most shaped frames to 1-1/2” or less in thickness.

See some of the round, oval, arched & shaped frames we have produced for artists like you!