What a blind hem is and why the machine method works

A blind hem is a stitch that closes a fold of fabric so the thread is nearly invisible from the outside. On trousers, skirts, and curtains, it creates a professional finish that looks hand-sewn. A sewing machine can do this faster and more evenly than hand-stitching, using either a blind hem foot (the most common method) or a regular presser foot with careful folding.

The machine works by catching just a thread or two from the fold of fabric, then diving into the body of the garment. From the outside, you see almost no thread. The stitch is strong enough for everyday wear and holds up through washing.

Key Takeaways

  • A blind hem foot is the easiest tool for this job; it costs $8 to $20 and fits most machines, though you should check your manual to confirm compatibility.
  • The fabric must be folded so the raw edge is hidden inside, and you stitch along the fold line with the needle catching just the fold and the garment body below it.
  • Test your stitch on a scrap of the same fabric first, because tension and needle position vary by machine and fabric weight.
  • The stitch works best on medium-weight fabrics like cotton and linen; very heavy fabrics may need a heavier needle, and very light fabrics may show thread.

Getting the right foot and checking your machine

Most sewing machines can do a blind hem stitch, but you need the right foot. A blind hem foot (also called a blind stitch foot) has a guide that keeps the fold of fabric centered under the needle. It costs between $8 and $20 and is sold by machine brand—Janome, Brother, Singer, Bernina, and others each have their own version.

Check your machine's manual or the manufacturer's website to find the correct foot for your model. If you have lost the manual, search "[your machine brand and model] blind hem foot" online. Some machines come with one in the box; others do not. Once you have the foot, snap or screw it onto your machine following the manual's instructions.

If you cannot find a blind hem foot for your machine, you can still sew a blind hem with a regular presser foot, though it requires more careful hand-positioning. This method is slower but works on any machine.

Preparing the fabric and setting the fold

Fold the raw edge of the fabric inward by about half an inch and press it flat with an iron. Then fold the garment itself so the fold line is visible and the raw edge is hidden inside. For a trouser hem, this means folding the pant leg up; for a skirt or curtain, folding the bottom edge up the same way.

The fold should be crisp and even. If it is wavy or loose, the stitch will be uneven. Pin the fold in place if needed, but remove pins as you sew—do not sew over them.

Now unfold the garment slightly so you can see both the fold line and the body of the fabric below it. The blind hem foot will ride along the fold, and the needle will swing out to catch a thread from the garment body. This is the key to the stitch: the needle must catch the fold and the fabric below it in the right rhythm.

Threading and tension settings

Thread your machine with thread that matches the garment color. Use the same thread weight and fiber as the garment itself—if the garment is cotton, use cotton thread; if it is polyester, use polyester. Mismatched thread will show and may break.

Set your machine to the blind hem stitch. On most machines, this is a built-in stitch; check your manual for the stitch number or symbol. The stitch looks like a short straight line with a zigzag at intervals.

Tension usually stays at the default setting (often marked as 4 or 5), but this varies by machine and fabric. A test swatch will tell you if you need to adjust. If the thread on top is too loose, the stitch will not hold; if it is too tight, the fabric will pucker. Start at the default and adjust only if the test fails.

Sewing the blind hem step by step

Position the folded fabric under the blind hem foot so the fold sits against the guide on the foot. The needle should be just to the left of the fold, ready to catch it. Lower the presser foot and begin sewing slowly.

The needle will move straight for a few stitches, then swing to the right to catch the fold, then return to straight. This rhythm repeats. If the needle is catching too much fabric (more than a thread or two), the stitch will show on the outside; if it is catching too little, the hem will not hold. Adjust the foot position slightly if needed, or check your manual for a tension or width adjustment.

Sew slowly and steadily. Speed is less important than control. Stop every few inches to check that the stitch is catching the fold correctly and not puckering the fabric. If something looks wrong, stop, unpick a few stitches, and reposition.

When you reach the end, backstitch a few stitches to lock the thread, then trim the thread tails.

Testing on a scrap before hemming the garment

Before you hem your actual garment, cut a scrap of the same fabric and practice the stitch. Fold and press it the same way you will fold the garment. Thread your machine and sew a few inches on the scrap.

Unfold the scrap and look at both sides. From the outside, you should see almost no thread—just a thin line of stitching along the fold. From the inside, you will see the thread clearly, but that is normal and hidden when the garment is worn. If the outside shows thick thread or loops, your tension is off or the needle is catching too much fabric. Adjust and test again.

Once the test looks good, you are ready to hem the garment. The confidence of a successful test run will make the real hem faster and less stressful.

Troubleshooting common problems

The stitch shows on the outside. This usually means the needle is catching too much fabric. Loosen the tension slightly, or adjust the foot so the fold is positioned further from the needle. Test on a scrap again before returning to the garment.

The fabric puckers or gathers. The tension is too tight. Loosen it by half a number (from 4 to 3.5, for example) and test again. Puckering can also happen if you are sewing too fast; slow down and let the machine do the work.

The thread keeps breaking. Check that the thread is wound correctly and that the needle is inserted all the way into the needle clamp. A bent or dull needle will also break thread; replace it with a fresh needle of the correct size for your fabric.

The stitch is skipping or uneven. The needle may be bent or the wrong size for your fabric. Replace it. Also check that the presser foot is seated correctly and that you are using the right stitch setting on your machine.

Frequently Asked Questions

Can I use a blind hem stitch on stretchy fabrics like knits?

A blind hem stitch can work on knits, but the stitch may break or pucker if the fabric stretches too much. Use a ballpoint or stretch needle (size 75/11 or 90/14) and reduce your tension slightly. Test on a scrap first. For very stretchy fabrics, a hand-sewn blind hem or a cover stitch machine may hold better.

What needle size should I use?

Use a size 70/10 or 80/12 for lightweight fabrics like cotton voile or linen. Use 90/14 for medium-weight fabrics like standard cotton or linen. Use 100/16 or 110/18 for heavy fabrics like denim or canvas. The needle package will tell you which fabrics each size is for.

Do I need to use a special thread for blind hemming?

No. Use regular all-purpose thread that matches your garment color. Some people use thread one shade lighter than the fabric, which can make the stitch less visible, but it is not required. Avoid thick decorative threads, which will show and may break.

How much fabric should I fold under before hemming?

Fold the raw edge under by about half an inch, then fold the garment up by the desired hem width (usually 1 to 2 inches for trousers, 1 to 3 inches for skirts). The exact width depends on the garment style and your preference.

Can I blind hem a curved edge, like the armhole of a shirt?

Curved edges are harder because the fold does not stay flat. For small curves, you can blind hem slowly and carefully, adjusting the fold as you go. For tight curves, a hand-sewn blind hem or a cover stitch machine works better. Test on a scrap of the same fabric and curve first.