How to tell a good stitch file from a bad one
You do not have to be a digitizer to tell whether a stitch file is any good, and you should not have to sew it to find out. There are five checks, they take a minute each, and every one of them has a number rather than an opinion attached. The numbers below come out of our own engine, measured on real marks — not from a manual.
The five checks, and the number for each
Stitches should cross each line rather than run along it — under 5 per cent running along is healthy. Coverage, meaning how many times thread crosses the fabric, belongs between 150 and 250 per cent. Trims on a chest-size badge should number in the tens, not the hundreds. No thread should travel across a hole in a letter, ever, not once. And the same artwork saved as PNG, JPEG and SVG should produce files within 10 per cent of each other.
Too dense is the usual failure, not too thin
Almost everyone expects a bad file to be sparse. It is the opposite. Coverage at 400 per cent is a stiff plate of thread that curls the garment, takes twice as long on the machine and can break needles. Density feels like quality when you read a number and looks like a mistake when you touch the shirt. If one figure on this page is worth memorising, it is the upper end of that range.
The check nobody runs: the same art, twice
Save your logo three ways and put all three through the same tool. If the results differ by more than about a tenth, the tool is not reading your artwork — it is guessing at a picture of it, and you will get a different result every time you come back. This is the single fastest way to tell an engine that understands shapes from one that is tracing pixels.
- How do I know if my embroidery file is good?
- Check five things: stitches crossing lines rather than running along them, coverage between 150 and 250 per cent, trims in the tens rather than the hundreds, no thread crossing a hole in a letter, and the same artwork producing the same file from any format.
- What is a good stitch density for embroidery?
- Between 150 and 250 per cent coverage for most work on woven fabric. Above 400 the piece goes stiff, curls the garment and doubles the time on the machine — that is the common failure, not a file that is too light.
- Why do trims matter in an embroidery file?
- Every trim is the machine stopping, cutting and starting again. On one badge a few hundred trims is slow; on a run of two hundred garments it is hours. Tens are normal for a chest-size mark, hundreds mean the path was never planned.
The workshop runs all five before it hands anything over, and shows you the sewn result on screen at your size. A file that fails one of them never reaches you.