What a blind hem is and why your machine can do it

A blind hem is a stitch that closes a fold of fabric so the thread is nearly invisible from the outside. Instead of a visible line of stitches running along the hem, the thread hides inside the fold, so from the front of the garment you see only a thin line where the hem was folded. Most modern sewing machines have a built-in blind hem stitch—usually marked as a sideways zigzag or a special stitch number in your manual—that does this automatically once you fold and position the fabric correctly.

The machine works by catching just a thread or two from the main fabric, then diving into the fold. That tiny catch is what holds the hem without showing. The hard part is not the stitching—it is the folding and positioning. Get those right, and the stitch does the work.

Key Takeaways

  • A blind hem stitch hides thread inside a folded edge so the hem is nearly invisible from the outside of the garment.
  • You must fold the hem up, then fold the main fabric back over it, leaving only a thin edge of the hem fabric showing for the needle to catch.
  • The blind hem foot (a special presser foot with a guide) keeps the needle in the right position; without it, the stitch will either miss the fabric or go too deep.
  • Test the stitch on a scrap of the same fabric and weight before hemming your actual garment, because tension and stitch width vary by machine and fabric.
  • The most common mistake is folding the hem too wide or too narrow—aim for a fold that shows about one-quarter inch of the hem fabric to the needle.

Prepare the hem by pressing and folding

Start by pressing the raw edge of the fabric up to the length you want the hem to be. If you are hemming pants that are 32 inches long, fold the fabric up 32 inches and press that crease with an iron. This is your hem fold line.

Next, fold the hem fabric itself up about one-quarter to one-half inch from the raw edge and press that fold too. This inner fold is what the needle will catch. Now unfold the main fabric (the part of the garment above the hem) so it lies flat again, but leave the hem folded up. You should see the hem standing up, with its own small fold at the top.

Finally, fold the main fabric back down over the hem, but not all the way. Leave about one-quarter inch of the folded hem edge showing. This thin strip is what the needle will stitch into. Press this fold lightly so it stays in place while you sew.

Install the blind hem foot and thread the machine

Remove your current presser foot and attach the blind hem foot. This foot has a metal guide—a small blade or ridge—that runs along the fold of the main fabric. The needle sits to the side of this guide. As you sew, the guide keeps the needle at the correct distance from the fold, so the stitch catches just enough fabric without going too deep.

Check your machine's manual for the correct stitch number or symbol for blind hem. On many machines it looks like a sideways zigzag or has "blind hem" written next to it. Set the stitch width to between 2 and 3 millimeters and the length to between 2 and 2.5 millimeters. These are starting points; you may adjust them after testing on scrap fabric.

Thread the machine as usual with thread that matches your garment. Wind a bobbin and insert it. Some machines work better with a slightly looser top tension for blind hem, so if your test stitches look loose or puckered, try turning the tension dial down by half a number.

Test the stitch on scrap fabric before hemming

Cut a piece of the same fabric you are hemming, at least 6 inches long and 4 inches wide. Fold and position it exactly as you would the real hem: fold up the hem, fold the hem edge itself, then fold the main fabric back over it, leaving that quarter-inch strip showing. Press the folds.

Place the fabric under the blind hem foot so the guide sits in the fold of the main fabric and the needle is over that thin strip of hem fabric showing. Lower the presser foot and sew slowly, about 3 to 4 inches. Stop and lift the presser foot.

Unfold the fabric and look at the stitch. You should see a small zigzag that catches the main fabric on one side and dives into the fold on the other. If the needle is catching too much fabric (the stitch is visible from the front), move the guide away from the fold slightly or reduce the stitch width. If the needle is missing the fabric entirely, move the guide closer to the fold or increase the stitch width. Adjust and test again until the stitch looks right.

Sew the hem on your garment

Once your test stitch looks good, position your garment under the blind hem foot the same way you positioned the test fabric. The guide should sit in the fold of the main fabric, and the needle should be over that thin strip of hem showing. Pin the hem in place if needed to keep the folds from shifting.

Sew slowly, about 3 to 4 inches per second, keeping steady pressure on the fabric. Do not pull or push the fabric—let the feed dogs move it. Stop every 8 to 10 inches to check that the folds are still in the right position and the guide is still in the fold. If the fabric shifts, stop, reposition, and continue.

When you reach a corner or the end of the hem, stop with the needle down, raise the presser foot, pivot the fabric, lower the foot, and continue. Sew all the way around the hem until you reach where you started.

Finish and press the completed hem

Raise the presser foot and remove the garment. Trim any loose threads. Unfold the hem and look at the stitches from the front of the garment. You should see only a thin line where the hem is; the thread should be nearly invisible.

Press the finished hem with an iron set to the heat appropriate for your fabric. Use a pressing cloth if your fabric is delicate or prone to shine. Press from the inside first, then flip the garment and press lightly from the outside. This sets the stitches and removes any creases from folding.

If you see stitches showing on the front, the needle was catching too much fabric. You can carefully pick out the stitches with a seam ripper and try again with a narrower stitch width or a guide position closer to the fold. If the hem is loose, the needle was not catching enough fabric; re-stitch with a wider stitch width or guide position farther from the fold.

Common mistakes and how to avoid them

The most frequent error is folding the hem strip too wide or too narrow. If the strip is wider than one-half inch, the needle may catch too much and the stitch will show. If it is narrower than one-quarter inch, the needle may miss it entirely. Measure and press carefully before you start sewing.

Another common problem is using the wrong presser foot. A regular foot does not have a guide, so the needle position drifts and the stitch becomes uneven. Always use the blind hem foot that came with your machine, or buy the correct one for your machine model if it is missing.

Tension that is too tight will pucker the fold or cause the thread to break. If your test stitch looks bunched or the thread snaps, loosen the top tension slightly and test again. Conversely, tension that is too loose will leave gaps in the stitch. If the stitches look loose and floppy, tighten the tension a little.

Finally, do not rush. Sewing a blind hem at high speed makes it straightforward to drift out of position. Slow down, keep your eyes on the guide and the fold, and stop often to check your work.

Frequently Asked Questions

Can I sew a blind hem on knit fabric or stretchy material?

Yes, but knits need a slightly different approach. Use a ballpoint or stretch needle instead of a universal needle, because these needles slide between fibers rather than piercing them. You may also want to use a narrow zigzag stitch instead of the blind hem stitch, or reduce the stitch width and length further. Test on a scrap first, because stretchy fabrics can shift under the presser foot.

What if my machine does not have a blind hem stitch?

Older machines or very basic models may not have this stitch built in. You can still hand-sew a blind hem using a needle and thread, which takes longer but works on any fabric. Alternatively, you can use a regular straight stitch very close to the fold, though this will be slightly visible. Check your machine manual to confirm whether blind hem is available.

Do I need a special blind hem foot, or can I use the regular foot?

You need the blind hem foot. The guide is what keeps the needle in the right spot. Without it, the needle will either catch too much fabric or miss the hem entirely. If your foot is lost or broken, you can order a replacement from the machine manufacturer using your machine model number.

How do I sew a blind hem on a curved edge, like an armhole?

Curved edges are harder because the fold shifts as you turn. Fold and press the hem as usual, then sew in short sections, stopping every 2 to 3 inches to reposition and check the fold. You may need to ease the fabric slightly as you go around the curve. Practice on a scrap garment first.

Why does my blind hem stitch look loose or have gaps?

Loose stitches usually mean the tension is too loose or the stitch length is too long. Tighten the top tension slightly or reduce the stitch length by a quarter millimeter and test on a scrap. If the needle is also missing the fabric, the guide may be too far from the fold. Move it closer and test again.