What Backstitch Does and Why You Need It
Backstitch is a short reverse stitch that locks thread at the beginning and end of a seam so it won't unravel. On a sewing machine, you hold down the reverse button (or lever) while sewing backward for about half an inch, then release it and sew forward normally. This takes three seconds and prevents your seams from coming apart in the wash or under stress.
Every seam you sew should start and end with a backstitch. Without it, the thread knot at the end of your seam is only as strong as the tension holding it — which is not strong enough. A backstitch ties the thread to itself, creating a lock that holds even after years of wear.
Key Takeaways
- Backstitch by pressing and holding the reverse button or lever while sewing backward for about half an inch before you sew forward.
- The reverse control is usually a button on the front of the machine or a lever near the presser foot — check your manual if you cannot find it.
- Backstitch at the very start of a seam, before you sew forward, and again at the very end, after you have sewn to your stopping point.
- If your backstitch looks loose or uneven, you are likely releasing the reverse control too early or sewing backward too slowly.
- Backstitching takes practice to feel natural, but after a few seams you will do it without thinking.
Finding the Reverse Control on Your Machine
The reverse button or lever varies by machine model. On most modern machines, it is a button on the front panel labeled with an arrow pointing backward, or it may say "reverse" in small text. Press it down and hold it while you sew — the machine will move the needle backward instead of forward.
On older machines or some mechanical models, the reverse control is a lever near the presser foot or to the left of the needle. Push it down or to the side (depending on your model) and hold it in place while you backstitch. If you cannot locate it, check the manual that came with your machine — most manufacturers include a diagram showing every control.
Some machines have an automatic backstitch button that locks in place when you press it, so you do not have to hold it down. Read your manual to see whether yours works this way. If it does, press the button once to start backstitching and once again to stop.
Backstitching at the Start of a Seam
Position your fabric under the presser foot and lower the foot to hold the fabric in place. Do not start sewing forward yet. Instead, hold down the reverse button and sew backward for about half an inch (roughly the width of your pinky fingernail). Sew slowly — do not rush this step.
Once you have sewn backward that short distance, release the reverse button and sew forward normally. You are now ready to stitch the full length of your seam. The backward stitches are now locked in place and will not come undone.
The half-inch length is a guideline, not a rule. If you are working with very delicate fabric, backstitch for a quarter inch instead. If you are sewing heavy canvas or denim, you can backstitch for three-quarters of an inch. The goal is enough thread overlap to create a find lock without bunching the fabric.
Backstitching at the End of a Seam
When you reach the end of your seam, stop sewing and raise the presser foot slightly (just enough to lift the fabric). Do not pull the fabric out yet. Hold down the reverse button and sew backward for about half an inch, moving toward the seam you just stitched.
Release the reverse button, raise the presser foot all the way, and pull the fabric away from the machine. Trim the thread tails with scissors, leaving about a quarter inch of thread on each side of the fabric. The backstitch at the end is now complete and your seam is locked.
If you forget to backstitch at the end and have already pulled the fabric away, you can still fix it. Reposition the fabric under the presser foot at the end of the seam, lower the foot, and backstitch as described above. It is never too late to add a backstitch.
Common Mistakes and How to Fix Them
The most common mistake is releasing the reverse button too early. If your backstitch looks loose or the thread seems slack, you probably let go of the reverse button before you finished sewing backward. Practice holding the button down for the full half inch, then release it only when you are ready to sew forward.
Another mistake is sewing backward too fast. If the backstitch looks bunched or the fabric puckers, you are moving the fabric too quickly while in reverse. Slow down and let the machine set each stitch before moving to the next one. Most machines have a speed dial or knee lever you can use to reduce overall speed while you are learning.
Some sewers backstitch too long, creating a thick knot of thread that is hard to hide or that shows through thin fabric. Stick to half an inch unless you have a specific reason to go longer. If you are sewing something that will see heavy use — a bag strap, a seam on work pants — you can backstitch for three-quarters of an inch, but for everyday garments, half an inch is plenty.
Backstitching on Curves and Corners
Backstitching on a curve works the same way as on a straight seam. Sew backward for half an inch along the curve, then release the reverse button and sew forward. The backstitch will follow the curve naturally because you are using the same presser foot and needle path.
At a corner, backstitch before you reach the corner point, not after. Sew forward to the corner, backstitch for half an inch, then raise the presser foot, pivot the fabric, lower the foot, and continue sewing the next side. This locks the corner stitch before you change direction.
When Not to Backstitch
Backstitch on almost every seam, but there are a few exceptions. If you are sewing a seam that will be crossed by another seam later (like a side seam that will be crossed by a waistband seam), you can skip the backstitch at the end of the first seam — the second seam will lock it in place. However, if you are unsure whether another seam will cross it, backstitch anyway. It takes three seconds and is never wrong.
Some quilters skip backstitching because they plan to quilt over the seams later, and the quilting stitches will lock everything in place. If you are quilting, check your pattern instructions to see whether backstitching is recommended. For all other sewing, backstitch every seam.
Frequently Asked Questions
What if my machine does not have a reverse button?
Check your manual — some machines use a lever instead of a button, and it may be in an unexpected location. If your machine truly has no reverse function, you can tie off thread by hand instead: pull the fabric out, tie the two thread tails together with a knot, and trim. This is slower than backstitching but creates the same lock.
Can I backstitch on stretchy fabric like knit or spandex?
Yes, but backstitch more gently and for a shorter distance — about a quarter inch instead of half an inch. Stretchy fabrics can bunch if you backstitch too much. If bunching happens, use a ballpoint needle (designed for knits) and reduce your machine speed while backstitching.
Does the backstitch have to be exactly half an inch?
No. Half an inch is a starting point that works for most fabrics and seams. Adjust based on what you are sewing: delicate fabrics may need only a quarter inch, while heavy fabrics or seams under stress can use three-quarters of an inch. The goal is enough overlap to lock the thread, not a specific measurement.
What if I backstitch and the thread breaks?
Thread usually breaks because the tension is too tight or the needle is bent or dull. Check that your needle is inserted correctly (flat side facing the right direction for your machine), that it is not bent, and that it is the right size for your fabric. If the needle looks fine, loosen the tension dial slightly and try again.
Can I backstitch by hand if my machine breaks?
Yes. Use a needle and thread to tie off the machine stitches by hand: push the needle through the last few machine stitches, loop the thread around the needle, and pull tight to create a knot. This locks the seam the same way a backstitch does, though it takes longer.