What a hem foot does and why you need one
A hem foot (also called a blind hem foot or edge-joining foot, depending on the type) holds fabric at a precise distance from your needle so you can sew a straight line without measuring by hand each time. Instead of eyeballing the distance or pinning a guide, the foot's built-in guide rides along the fold of your hem or the edge of your fabric, keeping your stitches parallel and even.
The most common type is the blind hem foot, which has a metal or plastic blade that runs along a folded edge. As you sew, the blade stays in the fold while the needle catches just a thread or two of the fabric on the outside, creating a hem that is nearly invisible from the front. Without this foot, blind hemming by hand or with a regular presser foot takes much longer and the results are often uneven.
Key Takeaways
- A hem foot guides your fabric so stitches stay parallel to the edge without manual measuring or pinning.
- The blind hem foot works by running a blade along a folded edge while the needle catches only the outer layer of fabric.
- You must fold your hem to the correct width before sewing, and the fold must be pressed flat so the blade can ride smoothly.
- Most machines use a standard shank, but some older or specialty machines need a specific foot type, so check your manual or machine model before buying.
- Practice on scrap fabric first to find the right needle position, because the needle must catch only the fold, not the main fabric.
Choosing the right hem foot for your machine
Hem feet come in different styles, and the one you need depends on your machine type and the kind of hem you want to sew. The blind hem foot is the most popular and works on most modern machines with a standard presser foot shank. Some machines also accept an edge-joining foot, which has a narrower guide and is better for topstitching or sewing along a straight edge without folding.
Before you buy, check your sewing machine manual or the manufacturer's website to find out which feet your machine accepts. Many machines use a low-shank or high-shank system, and a foot designed for one will not fit the other. If you have an older machine or a specialty brand like Bernina or Janome, you may need a foot made specifically for that model. Most fabric and craft stores can tell you which feet fit your machine if you bring the model number.
Preparing your fabric and hem
The hem foot only works if your hem is already folded and pressed. Start by folding the bottom edge of your garment up to the width you want—usually one-quarter inch to one-half inch for a narrow hem, or up to two inches for a wider hem on pants or skirts. Press this fold flat with an iron so it holds its shape and the blade of the foot can ride smoothly along it.
Next, fold the hem up again to hide the raw edge. For a blind hem, fold the garment so the fold line is about one-quarter inch from the edge of the main fabric. This small gap is where the needle will catch. Press this second fold flat as well. If your hem is not pressed, the blade will slip and slide, and your stitches will wander all over the place.
Pin the hem in place if it helps you keep it steady, but remove pins as you approach them so they do not catch the foot or needle. Some people prefer to use a spray starch or fabric glue stick to hold the fold in place instead of pins.
Installing the hem foot and threading your machine
Raise your presser foot lever all the way up—this loosens the tension on the foot so you can remove and install it. Unscrew or unclip the old presser foot (the method depends on your machine; check your manual if you are not sure). Slide the new hem foot onto the shank, making sure it sits all the way down and is level, then tighten the screw or clip.
Lower the presser foot lever to lock the foot in place. Thread your machine as you normally would, using thread that matches your fabric or a neutral color like gray or tan for blind hemming. For blind hemming, many sewers use a slightly thinner thread or a specialty thread like monofilament (clear nylon), which is nearly invisible in the finished hem.
Positioning the needle and testing on scrap fabric
The needle position is the most important step, and it is where most people go wrong the first time. The needle should be positioned so it catches only the fold of the hem, not the main body of the fabric. On most machines, this means moving the needle position to the left (if your machine allows it) or choosing a stitch that is designed for blind hemming.
Before you sew on your garment, test on a scrap of the same fabric folded the same way. Sew a few inches and then unfold the hem to see where the needle caught. If it caught too far into the main fabric, the stitch will show on the front. If it caught only the fold, the stitch will be hidden. Adjust the needle position slightly and test again until you get it right.
Once you have the needle position correct, you can also adjust the width of the stitch (how far the blade extends) and the length of the stitch (how far the needle moves forward between stitches). A shorter stitch length (around 2.0 to 2.5 millimeters) gives you more stitches per inch and a stronger, less visible seam.
Sewing the hem with the foot
Place your folded and pressed hem under the foot so the blade rides along the fold. The blade should sit right in the crease of the fold, not above it or below it. Lower the presser foot lever to lock the foot down and engage the tension.
Sew slowly and steadily, guiding the fabric gently so the blade stays in the fold. Do not pull the fabric toward you or push it away—let the feed dogs move it forward at their own pace. If the blade starts to slip out of the fold, stop, raise the foot, reposition the fabric, and start again. Sewing blind hems takes practice, so do not be discouraged if your first attempt is not perfect.
When you reach the end of the hem, stop with the needle down, raise the foot, and pull the fabric away. Trim the thread tails and press the finished hem with an iron to set the stitches and remove any wrinkles.
Troubleshooting common problems
If your stitches are showing on the front of the fabric, the needle is catching too much of the main fabric. Move the needle position further to the left (or adjust according to your machine's design) and test again on scrap fabric. If the stitches are skipping or breaking, check that your thread is threaded correctly and that the needle is inserted all the way up into the needle clamp.
If the blade keeps slipping out of the fold, your hem may not be pressed firmly enough. Use a hot iron and press for several seconds to set the fold. You can also try using a spray starch or fabric glue stick to hold the fold in place. If the foot itself is damaged or the blade is bent, it will not ride smoothly—replace the foot with a new one.
If you are sewing a very thick fabric or multiple layers, the foot may not sit flat. In this case, you may need to use a regular presser foot and sew the hem by hand or use a different hemming method altogether.
Frequently Asked Questions
Can I use a hem foot on knit fabrics?
Yes, but knits need a stretch needle and a ballpoint or stretch stitch to prevent runs and skipped stitches. The hem foot itself works the same way. Fold and press your hem as usual, and use a stitch designed for knits (often labeled "stretch blind hem" in your machine's stitch menu) to keep the fabric from puckering.
What is the difference between a blind hem foot and an edge-joining foot?
A blind hem foot has a wider guide and is designed for folded hems where the needle catches only the fold. An edge-joining foot has a narrower guide and is better for topstitching along a straight edge or sewing two edges together. Check your machine manual to see which feet are available for your model.
Do I have to use monofilament thread for blind hemming?
No, but monofilament (clear nylon thread) is nearly invisible in the finished hem, so it is popular for garments where you do not want the stitches to show. You can also use thread that matches your fabric or a neutral color like gray or tan. Monofilament can be tricky to thread and may break more easily, so practice with regular thread first if you are new to blind hemming.
What if my machine does not have a blind hem stitch?
Some older machines do not have a built-in blind hem stitch. In this case, you can use a straight stitch and position the needle carefully so it catches only the fold. Test on scrap fabric first to make sure the needle position is correct. You may also be able to sew the hem by hand using a blind stitch, which takes longer but gives good results.
Can I use a hem foot on curved hems?
Curved hems are difficult with a hem foot because the blade may slip out of the fold as you turn. For curved hems like armholes or necklines, it is usually easier to use a regular presser foot and sew by hand using a blind stitch, or to use a narrow rolled hem foot if your machine has one.