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About this tool
Work out gallery wrap bleed, total print size and the safe zone so nothing important wraps around the stretcher bar edge.
Canvas Wrap Bleed Calculator works out the full print size a gallery-wrapped canvas needs: print width equals face width plus twice the stretcher bar depth plus twice the back tuck, and the same again for height. It reports the bleed on every edge, the safe zone your subject must stay inside on the front face, how much of the image disappears around the sides, and the pixel count needed to hit 300 DPI at that print size. Aimed at photographers and print buyers sizing a file before it goes to a canvas lab.
Open Canvas Wrap Bleed Calculator on AltFTool — it loads instantly in your browser.
Enter the finished size in Visible face width and Visible face height and pick Millimetres, Centimetres or Inches in Working unit — the form opens at 40 × 50 cm.
Set Stretcher bar depth (or tap the 0.75" bar, 1.25" bar, 1.5" bar or 2" bar chip), Back tuck (stapling allowance), Safe margin inside the face, and Source file width (pixels, optional) if you want a resolution check.
Total print size (with bleed) updates live above rows for Bleed per edge (depth + tuck), Safe zone on the face, Image area hidden by the wrap, Extra material vs a flat print, Pixels needed at 300 DPI and Resolution of your file at print size. Copy result copies the summary; Reset returns to 40 × 50 cm.
Face size plus depth plus tuck on all four edges, in millimetres, centimetres or inches.
Shows how far in from the sheet edge your important detail has to start.
Compares your file width against the printed sheet and flags anything under 150 DPI.
Bleed per edge equals the stretcher bar depth plus the back tuck, so a standard 1.5 inch bar with a 1.5 inch tuck needs 3 inches (about 76 mm) on every side — 6 inches added to both the width and the height. Slim 0.75 inch bars with a 1.5 inch tuck need about 57 mm per edge.
The safe zone is the part of the front face where nothing gets bent over the corner fold, normally at least 0.5 inch (about 13 mm) inside the fold line. Faces, text and signatures should sit inside it; anything closer to the edge risks landing on the rounded corner or being pulled out of square during stretching.
Use an image wrap when the photo has spare margin you are happy to lose around the sides, and a mirrored wrap when the composition reaches the edges — mirroring flips a strip of the image outward so the sides are filled without cropping the front. A solid colour wrap is the third option and loses nothing at all.
Most canvas labs ask for 150 DPI as a minimum and 300 DPI as the target, measured across the full printed sheet including bleed rather than just the visible face. Canvas texture hides softness better than photo paper, so 150 DPI usually looks acceptable on large pieces viewed from a normal distance.
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