What a hemming foot does and when to use it

A hemming foot (also called a blind hem foot or blind stitch foot) is an attachment that guides fabric so you can sew a hidden seam along the fold of a hem. Instead of stitching through both layers of fabric where it shows on the outside, the needle catches just a thread or two of the fold, then passes through the inner layers. The result is a hem that looks hand-sewn from the outside.

You use a hemming foot when you want a professional finish on pants, skirts, dresses, or any garment where a visible stitch line would look unfinished. It works best on woven fabrics like cotton, linen, and wool. Stretchy knits can work, but they require a different technique and a ballpoint needle.

The foot is not the same as a regular presser foot. It has a small metal guide or blade on the left side that rides along the fold of your hem and keeps the needle in the right position. Without this guide, your stitches would either miss the fold entirely or go too deep and show on the outside.

Key Takeaways

  • A hemming foot has a metal guide that rides along the fold of your hem to position the needle correctly for hidden stitches.
  • You must fold and press your hem before you start sewing, and the fold must face left as you feed fabric under the foot.
  • The blind hem stitch (a zigzag that mostly goes straight, then jogs left once per cycle) is the correct stitch pattern for this foot.
  • Test your stitch on scrap fabric first, adjusting the stitch width until the needle just barely catches the fold on the left jog.
  • Sewing speed should be slow and steady—rushing causes the needle to miss the fold and create visible stitches.

Prepare your hem before you attach the foot

The hemming foot cannot create a hem from scratch. You need to fold and press your hem first. Measure up from the bottom of your garment to the length you want (for example, 1.5 inches for a standard pant hem), then fold the fabric up at that line and press it with an iron. Press firmly so the fold holds its shape.

Next, fold the hem up again so the raw edge is hidden inside. For a standard hem, you would fold up another 0.5 to 0.75 inches. Press this second fold as well. The fold that will ride against the guide on your hemming foot should be crisp and sharp—a soft or wrinkled fold will cause the needle to slip and miss stitches.

If your fabric is slippery (silk, satin, or rayon), use a strip of fusible web or hem tape between the two layers of the hem before you press. This keeps the hem from shifting while you sew. Follow the product instructions for the heat and pressure needed.

Install the hemming foot and thread the machine

Raise your presser foot lever all the way up. This releases the tension on the presser foot bar so you can slide the old foot out. Most feet slide out toward you or to the side—check your machine's manual if you are not sure which direction.

Slide the hemming foot onto the bar in the same direction you removed the old foot, then lower the presser foot lever. The foot should sit flat and not rock side to side. If it does, it is not seated correctly—lift the lever and reseat it.

Thread your machine with thread that matches your fabric color. Use the same thread in the bobbin. For most fabrics, all-purpose polyester or cotton thread works fine. If you are hemming a knit, use a ballpoint needle (size 75/11 or 80/12) to avoid snagging the fibers.

Set your stitch pattern and test on scrap fabric

Select the blind hem stitch on your machine. This stitch looks like a series of straight stitches with an occasional zigzag jog to the left. The straight stitches run along the fold, and the left jog is where the needle catches the fold itself. Different machines call this stitch different names—check your manual for "blind hem," "blind stitch," or "hidden stitch."

Set your stitch width to 2.0 to 2.5 mm to start. You will adjust this after you test. Set your stitch length to 2.0 to 2.5 mm as well. These are starting points; you may need to go wider or narrower depending on your fabric and how much of the fold you want the needle to catch.

Cut a piece of scrap fabric the same weight as your garment and fold it the same way you folded your hem. Place it under the foot so the fold sits against the guide on the left side of the foot. The guide should ride along the fold, not dig into it. Lower the presser foot and sew a few inches slowly.

Stop and look at your stitches. The needle should catch only one or two threads of the fold on the left jog. If the needle is missing the fold and stitching into the flat fabric, your stitch width is too narrow—increase it by 0.5 mm and test again. If the needle is going too deep into the fold and stitches show on the outside, decrease the width by 0.5 mm.

Sew your hem slowly and keep the fold against the guide

Place your garment under the foot with the hem folded as you practiced. The fold must sit against the metal guide on the left side of the foot. This is the most important step—if the fold is not touching the guide, the needle will not land in the right spot.

Lower the presser foot and begin sewing at a slow, steady pace. Do not rush. The guide needs time to ride along the fold without slipping. If you sew too fast, the guide can bounce away from the fold, and your stitches will miss. Aim for a speed where you could comfortably stop and start without jerking the fabric.

As you sew, watch the fold against the guide, not the needle. If the fold starts to drift away from the guide, stop with the needle down, lift the presser foot, and reposition the fabric so the fold is back against the guide. Then lower the foot and continue. It is better to stop and adjust than to sew a line of visible stitches.

Sew all the way around the hem. When you reach the starting point, sew over your first few stitches by about 0.5 inches, then stop. Raise the presser foot and pull the fabric away gently. Trim the thread tails close to the fabric.

Common mistakes and how to fix them

The most common mistake is sewing too fast. Your foot cannot guide the fold properly if you are rushing. Slow down to half the speed you normally use for straight seams. The second mistake is not pressing your hem hard enough before you sew. A soft fold will shift under the guide and cause the needle to miss. Press your hem with a hot iron and let it cool before you sew.

If your stitches are visible on the outside of the garment, your stitch width is too wide and the needle is catching too much of the fold. Decrease the width by 0.5 to 1.0 mm and test again on scrap fabric. If your stitches are missing the fold and running through the flat fabric, your stitch width is too narrow or the fold is not sitting against the guide. Check that the fold is touching the guide, then increase the width if needed.

If the thread is breaking or shredding, your needle may be dull or bent. Replace it with a fresh needle. If you are hemming a knit fabric and the needle is snagging fibers, switch to a ballpoint needle, which has a rounded tip that slides between fibers instead of piercing them.

Hemming foot alternatives if yours is damaged or missing

If your hemming foot is lost or broken, you have two options. The first is to order a replacement from your machine's manufacturer or a sewing supply store. Provide your machine's model number so you get the correct foot. Most replacement feet cost between $15 and $30.

The second option is to sew your hem by hand using a blind stitch, which is faster than you might think and gives you more control over how much of the fold the needle catches. A blind stitch is done with a needle and thread, not a machine. You catch one or two threads of the fold, then pass the needle through the inner layers of the hem for about 0.25 inches before bringing it back out to catch the fold again. This creates a seam that is nearly invisible from the outside.

Frequently Asked Questions

Can I use a hemming foot on knit fabrics?

Yes, but you need a ballpoint needle (size 75/11 or 80/12) instead of a universal needle. Ballpoint needles have a rounded tip that slides between fibers instead of piercing them, which prevents runs and snags. Use the same blind hem stitch and test on scrap knit fabric first, as the stitch width may need to be narrower than it would be for woven fabric.

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

Some older or simpler machines do not have a blind hem stitch built in. In that case, you can sew your hem by hand using a blind stitch, which takes about the same time as a machine hem and gives you more control. Alternatively, you can use a regular straight stitch and accept that the stitches will show on the outside—this is common on casual garments and children's clothes.

How do I know if the fold is sitting against the guide correctly?

The fold should touch the metal guide on the left side of the foot without being pinched or bent. If you look from above while the presser foot is down, you should see the fold nestled against the guide. If the fold is sitting flat on the plate of the foot instead of against the guide, lift the presser foot and reposition the fabric so the fold rides against the guide.

Can I adjust the stitch width while I am sewing?

Most modern machines allow you to adjust stitch width on the fly, but it is better to stop, make the adjustment, and test on scrap fabric first. Changing the width mid-seam can cause uneven stitches. If you notice the needle is missing the fold as you sew, stop, increase the width by 0.5 mm, and continue on a new section of the hem.

Why do my stitches look loose or loopy?

Loose stitches usually mean your tension is too loose. Check your machine's tension dial—it is often numbered 0 to 9, with 5 as the default. Try increasing tension by half a number (for example, from 5 to 5.5) and test on scrap fabric. If the stitches are still loose, increase it another half number. Do not go above 7 without testing, as very tight tension can break thread or damage your machine.