What Backstitching Does and Why You Need It

Backstitching means sewing backward a few stitches at the start and end of a seam to lock the thread in place so it does not unravel. Without it, the first and last stitches slip loose, and your seam falls apart. A backstitch takes about three seconds and is the difference between a seam that holds and one that fails the first time you wash or wear the garment.

Every sewing machine has a backstitch button or lever. You press or hold it while the needle moves, and the machine reverses direction. The thread loops lock around themselves, and the seam becomes permanent. You do this at the very start of every seam and again at the very end, before you cut the thread and remove the fabric.

Key Takeaways

  • Press the backstitch button or lever while the needle is moving to reverse the machine and lock stitches in place at the start and end of every seam.
  • Backstitch for about half an inch (three to five stitches) at the beginning of a seam, then sew forward normally for the rest of the seam.
  • At the end of the seam, backstitch again for half an inch before you stop the machine and remove the fabric.
  • If your machine has a needle-down setting, use it so the needle stays in the fabric when you reverse, keeping the seam straight.
  • Backstitching works the same way on all sewing machines, though the button or lever location varies by model.

Locating the Backstitch Control on Your Machine

The backstitch control is usually a button on the front of the machine, near your right hand as you sit at the machine. On some models it is a lever you push forward or pull back. Check your machine's manual or the machine itself for a symbol that looks like a needle with an arrow pointing backward, or the word "reverse."

On older machines, the backstitch button may be on the side or under the presser foot lever. On computerized machines, it is often a large button in the center or lower right of the control panel. If you cannot find it, look at the manual that came with your machine, or search the model number online plus the word "backstitch" to find a diagram.

How to Backstitch at the Start of a Seam

Place your fabric under the presser foot and lower the foot to hold it in place. Position the needle at the point where you want the seam to start—usually a quarter inch from the edge of the fabric. Lower the needle into the fabric by turning the handwheel or pressing the needle-down button.

Hold the backstitch button or lever down and let the machine sew backward for about three to five stitches (roughly half an inch). Then release the button and sew forward normally for the rest of the seam. The backward stitches lock the thread, and the forward stitches form the actual seam.

If your machine has a needle-down setting in the menu, turn it on before you start. This keeps the needle in the fabric when you reverse, so the seam stays straight and does not shift.

How to Backstitch at the End of a Seam

When you reach the end of the seam, stop the machine. The needle should be in the fabric (use needle-down if your machine has it). Press and hold the backstitch button and let the machine sew backward for about three to five stitches, the same distance as you did at the start.

Release the backstitch button and stop the machine. Raise the presser foot and pull the fabric away from the needle. Cut the thread, leaving a tail of about four inches. The backward stitches at the end lock the seam so it cannot unravel when the fabric moves or stretches.

Common Mistakes That Weaken the Backstitch

The most common error is backstitching too far—more than half an inch. This creates a thick, stiff spot in the seam that can be uncomfortable to wear and may pucker the fabric. Three to five stitches is enough; more does not make the seam stronger.

Another mistake is forgetting to backstitch at the end of the seam. Many people remember the start but skip the end, and the seam unravels from the back. Make it a habit: backstitch at the start, sew the seam, backstitch at the end, cut the thread. Every time, no exceptions.

If the backstitch stitches look loose or uneven, check that the presser foot is down and the fabric is flat under the needle. A loose presser foot or bunched fabric will not hold the thread tight, and the backstitch will not lock properly.

When You Cannot Backstitch (Curved Seams and Delicate Fabrics)

On very tight curves, backstitching can bunch the fabric or pull the seam off line. Instead, sew forward slowly and carefully at the start and end, keeping tension even on both sides of the fabric. The stitches will still hold if the tension is correct, even without the backward motion.

On delicate fabrics like silk or lightweight knits, a full backstitch can leave a visible pucker. Try a shorter backstitch—just two or three stitches—or use a smaller stitch length (a lower number on the dial) so the backward stitches are closer together and less noticeable. Test on scrap fabric first.

For seams that will be hidden inside a garment (like a side seam), a standard backstitch is fine. For visible seams or hems, you may want to test the backstitch length on scrap fabric to see if it shows.

Frequently Asked Questions

What if I forget to backstitch at the start?

Stop the machine when ready and backstitch from where you are back to the start of the seam. Then sew forward again to where you stopped. It takes a few extra seconds but prevents the seam from unraveling. If you have already sewn several inches, you can also tie a knot in the thread by hand on the back of the fabric, though backstitching is faster and neater.

Can I backstitch by hand if my machine button is broken?

Yes. Tie a knot in the thread on the back of the fabric at the start and end of the seam. Use a needle to weave the thread back through the last few stitches, then cut the thread. This is slower than using the machine button, but it locks the seam just as well. Have the machine button repaired when you can.

Does backstitch length matter?

Yes. Three to five stitches (about half an inch) is standard and strong enough for most fabrics. Longer backstitches (more than half an inch) create a stiff spot and can pucker. Shorter backstitches (one or two stitches) may not lock the thread firmly on heavy fabrics. Test on scrap fabric to find what works for your project.

Should I backstitch on seams that will be sewn over again?

No. If you are sewing a seam that will be crossed by another seam (like a side seam that will be crossed by a waistband seam), skip the backstitch on the first seam. The second seam will lock it. Backstitching both seams creates a thick, stiff spot that is uncomfortable and visible.