What a Blind Hem Stitch Does and Why It Matters

A blind hem is a stitch that closes the fold of fabric from the inside so the thread is nearly invisible on the outside. On a sewing machine, you use a special presser foot and a zigzag stitch that catches only a thread or two of the fold, then moves into the body fabric. The result looks like a hand-sewn hem—clean and professional—without the hours of hand work.

Most modern sewing machines have a blind hem stitch built in, usually marked as stitch 18 or 19 in the stitch menu, though the exact number varies by brand. You do not need an expensive machine; even basic models often include this stitch. What you do need is the correct presser foot (called a blind hem foot) and fabric that is prepared the right way before you sit down to sew.

Key Takeaways

  • A blind hem stitch catches only the fold of fabric, so the thread stays hidden inside the hem and does not show on the outside.
  • You must use a blind hem presser foot, which has a guide that keeps the needle in the right position relative to the fold.
  • The fabric fold must be pressed sharp and positioned so the needle catches only one or two threads of the fold, then swings into the body fabric.
  • Test your stitch on scrap fabric first, because the needle position and thread tension often need adjustment before you sew the actual garment.
  • Blind hem stitches work best on woven fabrics and knits that hold a crease; they are harder to control on stretchy or slippery materials.

Prepare Your Hem Before You Sew

The success of a blind hem depends almost entirely on how you prepare the fabric. Start by folding up the hem to the finished length you want—usually 1 to 1.5 inches for pants or skirts. Pin it in place, then try on the garment to make sure the length is correct. Once you are satisfied, press the fold with an iron on medium heat. Press it flat and sharp; a soft, fuzzy crease will cause the needle to miss the fold.

Next, fold the hem up again and press the raw edge of the fabric under about 0.5 inches. This creates a clean edge and prevents fraying. Now unfold the hem completely so you can see both the main crease (where the hem will fold) and the smaller crease where you turned under the raw edge. The fabric should look like it has two parallel fold lines running around the garment.

Before you thread the machine, fold the hem back up one more time along the main crease and press it again. This refreshes the crease and makes it easier for the presser foot to grip and guide the fabric. Leave the hem folded as you move to the sewing machine.

Install the Blind Hem Foot and Thread the Machine

Consult your machine's manual to find the blind hem presser foot. It looks different from a standard foot—it has a metal guide or blade that sticks out to the left side. This guide is what keeps the fold of fabric in the correct position. Attach the foot according to your machine's instructions, making sure it clicks or locks into place.

Thread the machine with thread that matches your fabric color. For most garments, use the same thread in the bobbin and the needle. If your fabric is very thick or the thread is heavy, you may need to loosen the top tension slightly—start at one number lower than your normal setting and test before sewing the garment.

Select the blind hem stitch on your machine. This is usually a stitch that looks like a short zigzag with a longer straight section. The exact appearance varies by brand, but your manual will show you which number to choose. Set the stitch length to 2.0 to 2.5 millimeters and the stitch width to 1.5 to 2.0 millimeters. These are starting points; you will adjust them after you test on scrap fabric.

Position the Fabric Under the Presser Foot

With the hem still folded, position the garment under the presser foot so the fold of the hem sits against the metal guide on the left side of the foot. The guide should touch the fold lightly—not pressing hard, but making contact. The needle should be positioned so it swings just barely into the body fabric (the part above the fold), catching only one or two threads.

Lower the presser foot and take one stitch by hand, turning the wheel toward you. Look at where the needle enters the fabric. If it is hitting the fold straight on instead of just grazing it, the fabric is positioned too far to the left. If the needle is missing the fold entirely and stitching only into the body fabric, move the fabric slightly to the right. Make small adjustments—even 1/8 inch makes a difference.

Once the needle position looks correct, raise the presser foot and pull the fabric toward you slightly to start a new line. You are now ready to test on scrap fabric before sewing the actual garment.

Test on Scrap Fabric First

Cut a piece of scrap fabric at least 6 inches long and 4 inches wide. Fold it, press it, and fold the raw edge under exactly as you did with your garment. Position it under the presser foot using the same method. Sew a line about 4 inches long at a steady, medium pace. Do not rush; the machine needs time to complete each stitch cycle.

Stop and examine the stitching. Unfold the hem and look at both sides. On the outside of the fabric, you should see almost no thread—just a thin line of stitches running along where the hem folds. On the inside, you should see the zigzag stitch catching the fold and the straight stitches going into the body fabric. If the stitching looks loose or the thread is bunching, loosen the top tension by one number and test again.

If the needle is catching too much of the fold and the stitches are visible on the outside, move the fabric slightly to the right under the presser foot. If the needle is missing the fold and stitching only into the body fabric, move the fabric slightly to the left. Test again on a new section of scrap fabric after each adjustment. Once the stitching looks clean and the thread is nearly invisible on the outside, you are ready to sew the garment.

Sew the Hem on Your Garment

Position the garment under the presser foot using the same technique you used on the scrap fabric. Start at a seam or an inconspicuous spot in case the first few stitches are not perfect. Sew slowly and steadily, guiding the fold against the metal guide. Do not pull the fabric; let the machine feed it. Keep your hands relaxed and your eyes on the fold to make sure it stays in contact with the guide.

When you reach a corner or a seam, stop with the needle down, raise the presser foot, and pivot the fabric. Lower the presser foot and continue sewing. At the end, backstitch a few stitches to lock the thread, then trim the thread tails.

Unfold the hem and press it lightly with an iron on low heat. The stitches should be nearly invisible on the outside. If you see a line of thread on the outside, the needle was catching too much of the fold. You can use a seam ripper to remove those stitches and try again, or accept that blind hems are a skill that improves with practice.

Common Mistakes and How to Avoid Them

The most common mistake is not pressing the crease sharp enough before sewing. A soft crease causes the fold to shift under the presser foot, and the needle misses it. Always press the hem twice—once before you fold the raw edge under, and once after you fold the hem back up.

The second mistake is positioning the fabric too far to the left or right under the presser foot. The metal guide should touch the fold lightly, and the needle should swing just barely into the body fabric. Test on scrap fabric and adjust in small increments.

The third mistake is sewing too fast. A blind hem stitch is more complex than a straight stitch, and the machine needs time to complete each stitch cycle. Sew at a medium pace, about 3 to 4 inches per second. If the stitches are skipping or bunching, slow down even more.

Finally, do not assume your tension is correct just because it works for straight stitching. Blind hem stitches often need slightly looser top tension. Always test on scrap fabric before sewing the garment, and adjust the tension if the thread is bunching or the stitches look loose.

Frequently Asked Questions

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

Blind hem stitches work on knits, but they are harder to control because the fabric does not hold a sharp crease. If you want to try, use a ballpoint needle designed for knits, press the crease very firmly, and sew slowly. Many sewers prefer a regular straight stitch or a narrow zigzag for knit hems because they are more forgiving.

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

Older machines or very basic models may not have a blind hem stitch built in. You can still sew a blind hem by hand using a needle and thread, or you can use a narrow zigzag stitch and a regular presser foot, though the results will not be as clean. Check your manual to confirm whether your machine has the stitch; it may be listed under a different name.

Why is my blind hem stitch skipping stitches?

Skipped stitches usually mean the needle is not positioned correctly relative to the fold, or the fabric is moving too fast. Slow down and test on scrap fabric to confirm the needle position. If the problem continues, try a fresh needle—a bent or dull needle will skip stitches on any stitch type.

How do I remove a blind hem stitch if I make a mistake?

Use a seam ripper to cut and remove the stitches. Work from the inside of the garment and cut every third or fourth stitch, then pull the thread out. Press the crease again and re-sew. It is normal to need a second attempt; blind hems are a skill that improves with practice.

Can I use a blind hem stitch on heavy fabrics like denim or canvas?

Blind hem stitches work on heavy fabrics, but you may need to increase the stitch length to 2.5 to 3.0 millimeters so the stitches are strong enough to hold. Use a needle designed for heavy fabrics (size 16 or 18) and loosen the top tension slightly. Test on scrap fabric first, because heavy fabrics can be unpredictable.