Stitch Density

Stitch density is the distance between adjacent stitches, measured in millimeters. A density of 0.4mm means there is a stitch every 0.4mm across a shape. Lower numbers mean more stitches per unit area: denser coverage, heavier feel, higher stitch count, and longer machine time.

Default densities vary by stitch type and fabric. Satin stitches typically run at 0.35mm to 0.45mm. Fill stitches typically run at 0.4mm to 0.5mm. Underlay runs much sparser, often 1.5mm to 2.5mm. Lightweight fabrics like t-shirts need slightly less density to avoid stiffness and puckering. Heavy twills and jackets can take more density without distorting.

Density directly drives stitch count, which directly drives machine time and cost. Cutting density from 0.4mm to 0.45mm can reduce stitch count by ten percent or more on a large design, with very little visible difference. Conversely, raising density too high on a delicate fabric will cause the embroidery to perforate and tear the substrate. Digitizers tune density for each project rather than relying on defaults.

Density is also context-dependent. A bright thread color on a dark garment may show through gaps unless density is bumped up. A dark thread on a light garment can run thinner without exposing the fabric beneath. Experienced digitizers will sometimes use two densities in a single shape (denser at the edges, sparser in the middle) to balance coverage with weight.