Yes, most modern embroidery machines allow you to resize designs directly on the screen, but there are significant technical limitations you should know to avoid ruining your project or damaging your machine.

The General Rule: 10%

Most experts and manufacturers (like Brother and Elna) recommend staying within a 10% range when resizing on the machine.

- Enlarging (>10%): The machine typically pulls the existing stitches further apart. This creates gaps where the fabric shows through (poor density) and can result in "loopy" stitches that snag easily.

- Reducing (<10%): The machine pushes the stitches closer together. This makes the design too dense, which can lead to "bulletproof" embroidery (stiff fabric), broken needles, or thread nesting.

Why Machines Have Limits

The main reason for these limits is how the machine handles "stitch files" (like .PES, .DST, or .HUS):

- Stitch Processors: Many machines lack a built-in "stitch processor." This means when you resize, the machine doesn't add or remove stitches; it simply moves the existing needle-down points.

- Density Issues: Because the stitch count remains the same while the area changes, the stitch density becomes either too thin or dangerously thick.

- Physical Constraints: You are always limited by your hoop size. A machine will generally not let you resize a design beyond the boundaries of the hoop currently selected or attached.

If you need to change a design's size by more than 10%, you should use embroidery software