Embroidery Knowledge Base & Guides

DST is the most universally compatible embroidery format and works on virtually every commercial machine. However, the best format depends on your machine brand: PES for Brother, JEF for Janome, VP3 for Husqvarna Viking, HUS for older Husqvarna, and EXP for Melco. When you order from Sassy Digitizing, you receive all formats at no extra charge, so you always have the right file for your machine.

Thread breaks have several common causes: upper thread tension set too tight, a dull or incorrectly sized needle, thread caught on the spool or path, incorrect bobbin tension, and design issues like excessive density or sharp direction changes. Start by rethreading the machine completely, replacing the needle, and checking tension settings. If breaks persist on a specific design element, the digitizing density may need adjustment.

Stitch density is the distance between parallel rows of stitches, measured in millimeters. Standard fill density is 0.40–0.45mm for most fabrics. Lower values (denser stitches) add weight and can cause puckering or needle breaks on lightweight fabrics. Higher values (sparser stitches) reduce stitch count but may show gaps in the fill. Correct density varies by fabric type: caps need denser stitching than T-shirts due to the structured front panel.

Raster images (JPG, PNG, BMP) are made of pixels and lose quality when scaled up. Vector images (AI, EPS, SVG) are made of mathematical Bézier paths and scale to any size without quality loss. For embroidery digitizing, a clean vector file produces the most accurate result because the digitizer can trace exact shapes. For screen printing and vinyl cutting, vector files are required. If you only have a raster image, our team can manually redraw it as a clean vector.

Stitch counts vary significantly by design size and complexity. A standard left chest logo runs 5,000–12,000 stitches. Cap front designs typically fall between 4,000–8,000 stitches, and 3D puff designs between 8,000–15,000. A jacket back ranges from 25,000–60,000 stitches for a standard design up to 120,000 for complex artwork. Small text or monograms run 1,000–4,000 stitches. Stitch count directly affects machine run time and, with commercial pricing models, often determines the cost of production.

DST (Tajima) is a universal stitch file that contains only stitch coordinates, speed commands, and color stops; it carries no color data. The machine operator manually selects thread colors based on a separate color sheet. PES (Brother) is a machine-specific format that includes color metadata, thread palette references, and design thumbnails that display on the machine's screen. DST works on almost any commercial machine; PES is specific to Brother home and commercial embroidery machines.

If the same problem appears on every design, such as constant thread breaks, loops or an error code, start with the machine: rethread, change the needle, and check tension and the bobbin. If the problem only happens on one design, or always at the same spot in a design, the file is the likely cause, usually density that is too high, missing underlay or very short stitches. A properly digitized file should run cleanly on a well-maintained machine.

Puckering usually comes from density that is too high for the fabric, not enough or the wrong stabilizer, loose hooping, or missing underlay. Lightweight and stretchy fabrics such as T-shirts and performance polos are the most prone to it. Using the right stabilizer and hooping firmly helps, but if one design puckers on fabric that sews other designs flat, the design needs to be re-digitized with lighter density and proper underlay.

Free converters and auto-digitizing software can turn an image into stitches, but they cannot choose underlay, density or stitch direction for your fabric, so the results usually pucker, break thread or lose small text. For production work, a hand-digitized file is faster and cheaper in the long run than re-running failed sew-outs.