Embroidery lettering: minimum readable sizes, fonts and settings for small text

If your text has already stitched badly and you want the quickest checks, start at small lettering problems. This page is about building lettering that works from the start: how small you can go, how the font and stitch settings should change as the text shrinks, and what fabric does to readability.

How small can embroidered lettering be?

These are rules of thumb, not hard limits. Fabric texture, the font's design and your machine's precision all move the line. Measure height on the capital letters, from baseline to the top of a letter like H or E.

Why these numbers? A letter like E at 6 mm has three horizontal strokes and two gaps stacked in that height. Each stroke has to be a satin column wide enough to look like a stroke rather than a run, which in practice means at least about 1 mm with 40 wt thread. Three strokes at 1 mm plus two gaps leaves about 1.5 mm for each gap. Go smaller, and either the strokes become runs or the gaps disappear under thread spread. Thinner 60 wt thread lets each stroke drop toward 0.8 mm while still covering, which is where the smaller minimum comes from.

See thread weights for how 40 and 60 wt compare, and embroidery needles for why a finer needle matters: a 75/11 needle punches a hole sized for 40 wt thread, and at tiny sizes those holes are close enough to merge and cut the fabric between them.

Satin column width for small text

Most lettering is satin stitched, and the column width is what decides whether a letter reads. The two limits are:

• Too narrow (under about 1 mm with 40 wt): the satin cannot spread. It looks like a thick running stitch, letters look scratchy, and the column may not cover its underlay.
• Too wide for the letter size: strokes crowd each other and close the counters (the enclosed spaces in a, e, o, B, R).

For small text, good embroidery fonts reduce the stroke width proportionally less than the letter height. A 25 mm letter might have 3 mm strokes, but at 6 mm the strokes might stay near 1.2 mm rather than scaling to 0.7 mm. That is one of the main things a font digitized for embroidery does that a converted outline font does not.

Satins also have an upper limit around 7 to 10 mm before stitches get long enough to snag; for large lettering, split satins or fills take over. The stitch types page covers that range.

Underlay for small text: less is more

On large letters, an edge run plus zigzag underlay gives satins loft and keeps them straight. On small letters that same underlay takes up space the column cannot spare, and the columns come out fat with closed counters. Typical adjustments as text shrinks:

• Above about 10 mm: edge run plus zigzag, or whatever the font specifies.
• About 6 to 10 mm: center run only. It tacks the fabric down along the middle of the column without widening it.
• Below about 6 mm: center run or none, depending on fabric. On a firm woven with good stabilizer, none is often cleanest; on knits, a center run keeps the letters from wandering.

The general purpose of each underlay type is covered on the underlay page.

Density and pull compensation for lettering

A typical satin spacing is around 0.4 mm. On very small letters, the thread fills a larger share of a narrow column, so many digitizers open the spacing a little, for example to 0.45 or 0.5 mm, to keep thread from piling up in the turns of S, e and g. Reducing density also cuts the number of needle penetrations in a tiny area, which reduces the risk of perforating the fabric. The stitch density page explains the measurement units and limits.

Pull compensation works the other way at small sizes. Narrow columns lose a higher proportion of their width to pull, so a 1 mm column that pulls in 0.2 mm loses 20 percent. Small lettering usually needs a small amount of compensation, roughly 0.1 to 0.2 mm, on knits. Too much and the counters close.

Built-in fonts, keyboard fonts and TrueType conversion

Where your lettering comes from matters more than most settings:

Machine built-in fonts

Digitized by the manufacturer for that machine and tested at the sizes the machine allows. Usually reliable within those size limits, but they often stop resizing at a minimum height for good reason. Do not override that minimum by shrinking the design in other software.

Keyboard fonts in embroidery software

Fonts sold or bundled as digitized lettering (each letter built by hand with stitch angles, underlay and compensation). The best of them include separate versions for small sizes. Check the font's stated size range and stay inside it.

TrueType or OpenType conversion

Many programs can turn any installed computer font into stitches. Results are generally good for large, simple fonts and unreliable for small text, because the converter applies one set of rules to every letter instead of handling thin joins and tight curves individually.

Stitch-file lettering

Text bought as a finished DST or PES design. It was built for one size; resizing a stitch file by more than about 10 to 20 percent changes density and compensation in ways that hurt small text first. See resizing designs.

Serif vs sans-serif at small sizes

Sans-serif fonts with even stroke widths read best below about 8 mm. Serifs are tiny features that become a few stitches each at small sizes, and they either vanish or turn into blobs. Thin hairline strokes in high-contrast serif fonts (the thin part of a classic roman letter) drop below the minimum satin width first, so the letter loses its thin strokes entirely.

Script fonts need even more height, often 10 mm or more, because their connecting strokes are thin and their loops create small counters. Block monograms and bold sans-serifs are the safest choice for the smallest work, such as text under a logo on a shirt cuff.

Kerning and letter spacing

Spacing that looks right on screen often looks tight once stitched, because satins spread slightly and push into the gap. For small text, loosen letter spacing a little compared with what looks right on screen. Watch these pairs in particular:

• Round letters next to each other (oo, oe, co): curves bulge outward and touch.
• Letters with open sides (r, c, L): a gap that looks generous on screen can read as a missing letter if it is too wide, so kern these by eye on a test stitch-out rather than on screen.
• Connections and trims: on small text, letters joined by travel runs under the next letter avoid dozens of trims. Text with a trim between every letter takes longer and leaves tails that are hard to clip neatly at this scale.

The trims vs travel choice is part of stitch order and pathing.

Lettering on knits, towels and fleece

Textured fabrics are the main reason good lettering files fail on the garment. Terry loops and fleece pile push up between satin stitches and hide them; pique knit has a honeycomb surface that breaks thin strokes into dashes.

1. Add a water-soluble topper. A thin film on top of the fabric keeps loops and pile below the stitches. Tear the excess away after stitching and dab the remainder with a damp cloth.
2. Increase letter height. Go up at least one step from the smooth-fabric minimum.
3. Consider a knockdown stitch. A light, open fill under the lettering flattens pile permanently. It works well on towels and fleece where a topper alone is not enough.
4. Use cutaway on knits. Small text on a stretching base distorts letter shapes. A no-show mesh cutaway keeps it stable without showing through light shirts. The t-shirts and knits and towels and terry guides have the full setups.

Lettering on caps

Cap fronts are stiff and curved, and text across the front is usually 1/2 to 2 inches tall, so minimum size is rarely the issue. The problems are distortion and registration. Caps are normally stitched from the center outward so fabric is pushed toward the sides rather than bunched in the middle; for lettering, that means the center letter stitches first, then letters alternate outward. Many lettering tools have a cap or center-out sequencing option. Text near the brim or on the seam needs a little more height and less density so the needle does not deflect. The caps and hats page covers framing and stabilizer.