Print a 24 × 36 poster at home.

A 24 × 36 inch poster uses the same 2:3 shape as a 4 × 6 photo. A different aspect ratio means cropping or leaving some space; check the preview before making the PDF. Keep the original image file instead of a screenshot or a thumbnail downloaded from a messaging app.

Divide the image width in pixels by 24 and its height by 36. A 3600 × 5400 pixel image gives 150 pixels per printed inch; 7200 × 10800 gives 300. More pixels can look sharper up close, but viewing distance, source sharpness, and paper matter too. Theimage resolution calculator will check your file at the intended dimensions. Adobe explains the relation between image pixels and printed size in itsprint resolution guide.

Choose the paper you actually have: US Letter is 8.5 × 11 inches; A4 is 210 × 297 mm. Enter24 × 36 inches in the poster paper calculatorto see the rows, columns, and sheet count. Printer margins and page overlap affect the total, so do not estimate only from the raw paper area.

If the poster must fit a frame, use the exact finished dimensions rather than choosing a page grid by eye. A grid can leave extra paper to trim around the edges.

Open the 24 × 36 setup, upload the image, chooseExact size, and confirm 24 inches wide by 36 inches tall. Switch to A4 if that is the paper in your printer, set overlap for easier alignment, then inspect the preview. Download the tiled PDF only after checking the crop, orientation, page count, and labels.

Print the first page on ordinary paper. In the print dialog choose Actual size or100%; turn off Fit, Shrink, and Scale to page. Check that your selected paper size matches the PDF. For projects where measurements must be exact, run theprinter scaling test first.

If the proof is sharp enough and the edges have the expected overlap, print the remaining pages. Lay them out in page order, trim the required edges, align the repeated image areas, then tape or glue from the back. The assembly guide walks through the joins.