Why did my printed pattern come out smaller than it should?

Almost always because the PDF reader had “fit to page” turned on, which shrinks the drawing to fit the printable area without warning you. You need to print at 100% or “actual size.”

Can I print an A4 pattern on letter-size sheets?

Yes, by printing at 100% and accepting that a bit of margin gets cut off. What you should never do is let the reader scale it to fit: the scale is lost and the pattern becomes unusable.

How do I ask the print shop to print a pattern on a plotter?

Tell them to print at 100%, without fitting to the roll width, and at the width the file is prepared for: 90, 120, or 150 cm.

Mistakes When Printing PDF Sewing Patterns

The printing mistakes that distort a PDF sewing pattern without you noticing: automatic scaling, margins, misaligned taping, and how to avoid them.

The Silent Mistake: Automatic Scaling

It is the most common and the most dangerous, because the printed pattern looks perfect: the lines are there, the pieces are there, everything seems in order. All that happened is that it measures 4% less than it should, and that difference only shows up when the sewn garment doesn't come together.

The cause is an option that is turned on by default in almost every PDF reader: “fit to page,” “scale to printable area,” or “shrink oversized pages.” The reader detects that the drawing doesn't fit in the area the printer can print and shrinks it slightly so it fits. It never warns you.

The solution is to choose 100%, actual size, or “custom scale: 100” before printing, and to check the test square on the first sheet with a ruler.

Printing on a Different Paper Size

A pattern set up for A4 and printed on letter, or the other way around, gets distorted or cropped. The two sheets are similar but not the same: letter is wider and shorter.

Before printing, check that the selected paper size matches the file's. If the printer only has letter, print anyway at 100% and accept that the margin gets cut off: the scale is kept, which is what matters, even if you have to tape a little more carefully.

Taping the Sheets Without Following the Marks

The sheets of an A4 pattern come with alignment marks and numbering. Taping “by eye” makes each join add one or two millimeters of error, and in a twenty-sheet pattern that adds up to several centimeters by the end.

The right way is to overlap the sheets until the marks line up exactly, and only then tape. It is best to tape complete rows first and join the rows to each other afterward.

Using a Printer With Uneven Feed

Some old home printers feed the sheet unevenly and stretch the drawing in the direction the paper travels. The symptom is clear: the test square measures right in width but wrong in height.

If that happens, the way out is to print somewhere else or switch to the plotter format, which comes out on a single continuous sheet and doesn't depend on sheet-by-sheet feeding.

Plotting Without Specifying the True Width

In plotter format, the file comes prepared for a specific roll width: 90, 120, or 150 cm. If the plotting service prints it at a different width by “adjusting” it, the same thing happens as with A4, only bigger.

When sending a file to the plotter, it is best to state explicitly: print at 100%, without adjusting, on the roll width that matches the file.

Frequently asked questions

Why did my printed pattern come out smaller than it should?: Almost always because the PDF reader had “fit to page” turned on, which shrinks the drawing to fit the printable area without warning you. You need to print at 100% or “actual size.”
Can I print an A4 pattern on letter-size sheets?: Yes, by printing at 100% and accepting that a bit of margin gets cut off. What you should never do is let the reader scale it to fit: the scale is lost and the pattern becomes unusable.
How do I ask the print shop to print a pattern on a plotter?: Tell them to print at 100%, without fitting to the roll width, and at the width the file is prepared for: 90, 120, or 150 cm.