If you have ever digitized text and felt the result looked rough, grainy, or just amateur, the fill type is almost always the reason. The two most common ways to fill an embroidered shape are satin stitch and tatami (also called fill stitch or ceeding). They behave very differently, and using the wrong one for lettering is the single most common reason text looks off. This guide explains the difference and why SewFlow automatically uses satin for text.
What Is a Satin Stitch?
A satin stitch lays long, parallel threads back and forth across the narrow dimension of a shape, with each stitch spanning from one edge to the other. Because the thread travels in one continuous direction, it catches the light and creates a smooth, glossy, raised finish. Satin is the classic look of monograms, lettering, borders, and logo text — anywhere you want a polished, premium sheen.
What Is a Tatami (Fill) Stitch?
A tatami stitch fills a shape with rows of short running stitches, like mowing a lawn back and forth. The needle penetrates the fabric repeatedly across the entire interior of the shape, not just at the edges. This is ideal for large areas — the body of a logo, a background, a big solid shape — because it stays flat, stable, and uses thread efficiently. But those scattered interior penetrations create a matte, textured surface that reads as grainy on small or narrow shapes.
Satin vs Tatami at a Glance
| Feature | Satin Stitch | Tatami Fill |
|---|---|---|
| Best for | Letters, monograms, borders, thin shapes | Large areas, backgrounds, big solid shapes |
| Finish | Smooth, glossy, raised | Flat, matte, textured |
| Penetrations | Only at the two edges | Across the entire interior |
| Look on small text | Clean and crisp | Grainy and rough |
| Thread sheen | High (light reflects along the stitch) | Low (broken up by interior stitches) |
| Stability on big areas | Poor (long floats snag) | Excellent |
Why Satin Wins for Text
Lettering is made of narrow strokes. When you fill a narrow stroke with tatami, the interior needle penetrations break up the surface and the matte texture fights the shape of the letter — the eye sees noise instead of a clean character. Satin, by contrast, throws a single glossy pass across the width of each stroke, so the letter reads as one smooth, confident shape. That sheen is exactly what makes professional monograms and brand lettering look expensive.
- •Smoother edges — satin defines the outline of each stroke cleanly.
- •Better light reflection — the glossy finish makes text pop on caps, polos, and towels.
- •Fewer needle penetrations in small areas — less chance of distorting fine letters.
- •The look customers expect — satin is the industry standard for names and monograms.
When Tatami Is Still the Right Choice
Satin is not always the answer. Very wide strokes or large letters (think a chunky display headline several centimeters tall) can exceed the safe length for a satin stitch — long floats snag and pull. In those cases a split satin or tatami fill is more durable. The rule of thumb: satin for normal lettering and narrow strokes, tatami for big solid areas. Good software makes this decision for you.
How SewFlow Handles It
SewFlow automatically fills text with satin stitching. For any stroke too wide for a single safe satin pass, it splits the satin into machine-safe segments, and for unusually blobby shapes it falls back to tatami — so you always get the right finish without choosing manually.
Convert Your Text the Right Way
Because SewFlow defaults to satin for the text converter and tatami for images, you do not have to be a digitizing expert to get clean lettering. Type your text, pick a font, choose a size and format, and the engine produces a glossy, professional satin fill ready for your machine in JEF, DST, PES, EXP, XXX, or SEW.
Create crisp, glossy embroidered lettering in seconds:
Open Text to Embroidery →Quick Tips for Better Embroidered Text
- •Keep letter height at least 5 mm so satin strokes have room to form cleanly.
- •Choose bold or medium-weight fonts; ultra-thin script can be hard to satin at small sizes.
- •Increase the design size slightly if the preview shows cramped or overlapping strokes.
- •Use a stabilizer suited to your fabric to keep satin edges crisp.
- •Always run a test stitch on scrap fabric before your final piece.