Canada's temporary resident visa photo spec is a millimetre spec, not a pixel spec, which is why so many digital attempts fail. IRCC requires a frame of at least 35 mm x 45 mm (1 3/8 x 1 3/4 inches), with the head measuring between 31 mm and 36 mm from chin to crown inside it, the face centred, the top of the shoulders showing, and a plain white or light-coloured background. Two identical photographs are required, taken within the last six months, and the rule that matters most for a digital workflow: if the photographs are digital, they must not be altered in any way. That rules out sharpening, retouching, background replacement and auto-enhancement. What is allowed is the boring stuff: correct sizing, correct format, and a sensible file size. Since most applicants print the photo rather than upload it, compression is usually about producing a clean, correctly proportioned digital file that a print shop can lay out at 35 x 45 mm without resampling artefacts. Note too that applicants who submit biometrics at a visa application centre are not required to include paper photos at all, so check which path applies before printing. Skwish resizes to exact dimensions, compresses to a KB target and converts format in the browser — no upload, nothing altered beyond size.