How to Sew a Blind Hem

How to sew a blind hem comes down to one trick most sewists never expect the first time: you fold the garment almost inside out before you sew a single stitch. Once you understand why that fold exists, the rest of the technique makes a lot more sense, and the payoff is a hem with no visible stitching at all from the outside.

Quick Answer

To sew a blind hem, press and fold your hem up as usual, then fold the garment back on itself so only a narrow strip of the hem allowance sticks out. Select your machine’s blind hem stitch, line the fold up against the guide on your blind hem foot, and sew so the straight stitches stay on the allowance while the occasional zigzag just barely catches the main fabric. Unfold it and the stitching all but disappears.

What a Blind Hem Stitch Is (and When to Use One)

A blind hem stitch is a repeating pattern of several straight stitches followed by one zigzag stitch that swings over to catch just a thread or two of the outer fabric. According to Wikipedia, a blind stitch only picks up a few threads of the fabric with each pass, which is exactly why most of the stitching stays hidden inside the hem instead of showing on the right side.

That’s the whole appeal. A regular topstitched hem shows a visible line of thread all the way around. A blind hem shows almost nothing — just a tiny dot here and there if you look closely.

Best Fabrics and Projects for a Blind Hem

Blind hems work best on medium to heavyweight woven fabric with enough body to hide the small zigzag bite — think wool trousers, tailored skirts, curtains, and structured dresses. A pair of dress pants hemmed with a straight topstitch and the same pair hemmed blind look like two different price points, even though the fabric and fit are identical.

When to Skip It (Sheer Fabric, Some Knits)

Sheer or very lightweight fabric doesn’t have enough thickness to bury the zigzag bite, so the stitch ends up more visible than intended rather than less. If you’re working with chiffon or silk, a narrow rolled hem is a better match. Stretchy knit fabric can also be tricky, since the raw edge inside a blind hem tends to curl instead of lying flat, which keeps the hem from hanging straight.

Tools You’ll Need

Sewing machine with a blind hem stitch setting
Thread that closely matches your fabric color
Iron and ironing board
Pins or clips
Measuring tape and a hem gauge

Blind Hem Presser Foot (and Sewing Without One)

Close-up of a blind hem presser foot's guide used to align the folded fabric

A blind hem foot has a small metal guide that runs down the center, and it does two jobs at once. It keeps the folded edge lined up as you sew, and it holds the fold slightly away from the needle when the stitch swings left. That small gap is what gives the finished hem enough slack to hang freely instead of pulling tight.

Most machines that have a blind hem stitch built in are sold with this foot, or it’s available as a low-cost add-on. It’s possible to sew a blind hem with a standard foot by watching the fold carefully as you go, but the foot makes the whole process considerably more consistent, especially the first several times you try it.

Machine Settings — Stitch and Width

Select the blind hem stitch on your machine — it’s usually shown as a symbol with a row of straight lines and one jagged zigzag. Start with your machine’s default stitch length and a medium zigzag width, then adjust based on your test stitch, covered in more detail below. For general needle and thread guidance by fabric weight, our needle size chart covers the full range from lightweight to heavy fabric.

How to Sew a Blind Hem Step by Step

Step 1 — Press and Fold the Hem

Fold the raw edge of your hem up to your desired length and press it, the same way you would for any hem. For the full process of measuring and marking a new hem length, our guide on how to hem pants with a sewing machine covers that groundwork in detail — the steps below pick up once your basic hem is folded and pressed.

Step 2 — Fold Back to Expose the Hem Allowance

Hands folding fabric back to expose a narrow strip of hem allowance for a blind hem

This is the step that makes a blind hem different from every other hem technique. Fold the pressed hem back toward the right side of the garment, so the body of the garment and the hem allowance are folded against each other. Leave about ¼ to ⅜ inch of the hem allowance sticking out past that fold — this is the strip your needle will actually work on.

Step 3 — Position and Sew

Sewing machine needle stitching a blind hem, with straight stitches and one zigzag catching the fold

Slide the folded fabric under your blind hem foot so the exposed strip of hem allowance sits under the straight-stitch side of the foot, and the folded edge of the garment lines up against the guide. Sew slowly, watching that fold stay against the guide the whole way around. The straight stitches should land entirely on the hem allowance, and the zigzag should swing just far enough left to catch a thread or two of the folded garment edge.

Step 4 — Unfold and Press

Right side of a pressed pant hem showing nearly invisible blind hem stitching

Once you’ve stitched all the way around, unfold the garment flat and check the right side — you should see only small, scattered dots where the zigzag caught the fabric. Give the hem a final press from the right side to settle everything flat.

Testing and Adjusting Your Stitch Before You Commit

Sew a 3 to 4 inch test section on a scrap of the same fabric, folded the same way, before you commit to the full hem. Unfold it and check two things: whether the stitches are visible from the right side, and whether the zigzag is actually catching the fold at all. It’s much faster to adjust the width on a test strip than to unpick six inches of finished hem.

Troubleshooting Common Problems

Stitches Show on the Right Side

This usually means the zigzag width is set too wide, so the needle is swinging too far into the garment fabric instead of just grazing it. Narrow the zigzag width slightly and test again.

Zigzag Isn’t Catching the Fold

If nothing shows up on the right side at all, the opposite problem is happening — the zigzag isn’t reaching the fold. Widen the stitch a little at a time, or check that the folded edge is sitting snugly against the foot’s guide rather than drifting away from it.

Hem Won’t Hang Freely (Pulls Up)

A hem that pulls tight instead of hanging loose usually means the stitches were pulled too taut while sewing, or the fold wasn’t given enough slack against the foot’s guide. Loosen your top tension slightly and make sure you’re not tugging the fabric as it feeds through the machine.

Common Mistakes to Avoid

Skipping the test strip and adjusting the width on the actual garment instead
Folding the hem allowance flush with the fold instead of leaving that ¼ to ⅜ inch strip exposed
Using thread that doesn’t closely match the fabric color, which makes even a well-caught stitch more visible
Sewing too fast to keep the fold steady against the foot’s guide
Trying this technique on sheer or very lightweight fabric, where the bite shows more than it hides

FAQs

What is a blind hem stitch used for?

A blind hem stitch is used to finish a hem so the stitching stays nearly invisible from the outside of the garment. It works especially well on tailored pants, skirts, dresses, and curtains where a visible topstitch line would look less polished.

Can I sew a blind hem without a blind hem foot?

Yes, though it’s more difficult to keep the fold consistent by eye. A blind hem foot has a built-in guide that lines the fold up automatically, so most sewists find it worth using if their machine came with one or offers it as an accessory.

Why can I see my blind hem stitches from the outside?

Why can I see my blind hem stitches from the outside? This almost always means the zigzag width is set too wide, so the needle is catching too much of the outer fabric instead of just a thread or two. Narrow the width and test on a scrap before resewing the hem.

Can you blind hem stretchy or knit fabric?

It’s possible on sturdier knits, but the raw edge inside the fold tends to curl on lighter knit fabric, which can keep the hem from hanging flat. A twin needle hem is often a more reliable choice for stretchy fabric.

How much hem allowance do I need for a blind hem?

A blind hem generally needs a slightly wider allowance than a straight topstitched hem, since the fold-back step requires enough fabric to work with. Leaving 1.5 to 2 inches gives you room to fold and still expose the ¼ to ⅜ inch strip the stitch needs.

What’s the difference between a blind hem and a regular machine hem?

A regular machine hem is topstitched straight through all the layers, leaving a visible line of stitching on the outside. A blind hem folds the fabric so the machine only catches a thread or two of the outer layer, which is why the finished stitching is nearly invisible.

Conclusion

Once you know how to sew a blind hem, that fold-back step stops feeling strange and starts feeling like the whole point of the technique. It takes a little more setup than a straight topstitch, but the payoff is a hem that looks tailored rather than homemade. If you’re hemming pants, jeans, or a dress and want the visible-topstitch version instead, our guides on those techniques walk through that process in full.

Ready to try a blind hem? Start with a test strip on a fabric scrap so you can dial in your stitch width before committing to the real hem it saves far more time than unpicking a finished one. And when you’re ready for your next project, run your measurements through the SewSmartHub fabric yardage calculator so you never guess how much fabric to buy.