How to Print a PDF Sewing Pattern at Home Without Scaling Errors
June 20, 2026
The setting that causes it
Most printers and PDF software default to "Fit to page" or "Shrink to printable area." It sounds harmless. What it does is automatically resize the file to fit within the printer's margins — silently changing the scale.
The fix is one setting change: always print at 100%. In Adobe Reader, find it under Page Scaling → Custom Scale → 100%, or look for "Actual Size." Avoid anything with "fit," "fill," or "shrink." Open your pattern in a dedicated PDF reader, not a browser — browsers apply their own scaling regardless of what you set.
Verify before you print the full file
Every Patternalism pattern includes a 10 × 10 cm test square on the first page. Print that page first. Measure the square with a ruler along the outer edge of the frame.
If it measures exactly 10 × 10 cm — settings are correct, print the rest.
If it's off — stop. Correct the scale using this formula: New scale % = 100 ÷ (measured side in cm) × 10. If the square measures 9.5 cm: 100 ÷ 9.5 × 10 = 105%. Reprint the test page and measure again before continuing.
This step takes two minutes and is the only reliable way to confirm your printer isn't silently adjusting the file.
A4 at home vs large format at a copy shop
A4 patterns are split across multiple pages with a grid code on each sheet so you know where everything sits. Each printed page has this code in the bottom corner — for example (A,01). The letter is the row, the number is the column. Look for this code on every sheet before you start assembling; it's small, but it's exactly how you know which page goes where. The same 100% scale rule applies, and the same test square check.
Large-format files — 600 mm and 900 mm wide — are included with every Patternalism pattern. A copy shop with a plotter prints the entire pattern on one sheet with no assembly. If you have access to one, it removes the main difficulty of home printing entirely.
Full setup instructions for both formats — A4 assembly steps, plotter settings, and troubleshooting for the most common printing problems — are on our Printing Instructions page.