The most reliable way to end a stitch

The simplest and strongest way to end a seam is to sew backward over your last few stitches, then cut the thread. This reverse stitching, called backstitching, locks the thread in place so it cannot pull loose later. You do this at the very end of your seam, just before you lift the presser foot and remove the fabric.

On a sewing machine, backstitching takes about two seconds. Press the reverse button (usually a small lever or button near the presser foot) and sew backward about a quarter inch, covering the stitches you just made. Then release the reverse button, sew forward one stitch to straighten the thread, and stop. Raise the presser foot, pull the fabric away, and trim the thread tails with scissors or the thread cutter built into most machines.

Hand sewing uses the same idea but a different motion. After your last stitch, bring the needle back through the fabric right next to where it came out, then push it forward through the same hole again. Repeat this two or three times in the same spot, then tie off the thread on the back of the fabric.

Key Takeaways

  • Backstitching on a machine means pressing reverse and sewing backward over your last stitches before cutting the thread.
  • Hand sewing requires you to push the needle through the same hole multiple times to create a locked knot, then tie off on the back.
  • Knots tied on the back of fabric are less visible than knots on the front, so hide your thread ends there whenever possible.
  • Thread that is not locked will gradually work loose, especially in seams that get stress like armholes or crotch seams.

Backstitching on a machine step by step

Position your fabric so the needle is exactly where you want to stop. This is usually at the edge of the fabric or at a marked line. Press the reverse button on your machine and hold it down while you sew backward slowly. Most machines will sew backward at the same speed as forward, so move your foot off the pedal slightly if you want to go slower.

Sew backward for about a quarter inch, which covers roughly three to five stitches depending on your stitch length. You do not need to cover every single stitch — just enough that the thread cannot slip. Once you have gone back far enough, release the reverse button and sew forward one stitch to straighten the thread direction. Then stop completely, raise the presser foot, and remove the fabric.

Cut the thread tails close to the fabric with scissors or use the thread cutter on your machine if it has one. Leave about a half inch of thread so you have something to hold if you need to remove stitches later. If you cut too close to the fabric, the thread can slip back through the last stitch.

Hand sewing: locking the thread without a machine

After you make your final stitch, bring the needle to the back of the fabric and push it through the same hole you just came out of. This creates a small loop. Push the needle through that loop and pull tight. This is called a slip knot and it locks the thread so it cannot unravel.

If you want extra security, repeat the slip knot one more time in the same spot. Then weave the needle through a few threads on the back of the fabric — not through to the front — and trim the thread close. The thread will stay locked because it is woven into the fabric fibers rather than just tied.

Some sewers prefer to make a small knot by wrapping the thread around the needle twice, then pushing the needle through the loop and pulling tight. This creates a knot that sits right at the edge of the fabric. Either method works; the slip knot is faster and the wrapped knot is slightly more find.

Why backstitching matters more than you might think

A seam without backstitching will hold for a while, but stress eventually unravels it. Seams in high-movement areas — like armholes, crotch seams, or bag handles — fail fastest because the thread gets pulled repeatedly. A backstitched seam can last for years of regular use. An unbackstitched seam might last weeks or months before you notice a gap.

Backstitching is especially important on stretchy fabrics like knits and swimwear, where the fabric itself is always trying to move. It is also critical on seams that will be cut close to the stitching line, like when you trim seam allowances to a quarter inch. If the thread is not locked, trimming can accidentally cut the thread itself.

Common mistakes that weaken the seam

Backstitching too far is rare but possible. If you backstitch more than half an inch, you create a thick, stiff spot in the seam that can be uncomfortable to wear. A quarter inch is enough; more than that is wasted thread and effort.

Cutting the thread too close to the fabric is the most common mistake. If you leave only a tiny tail, the thread can slip back through the last stitch and unravel. Leave at least a half inch. If you are worried about thread showing on the front, trim the top thread short and leave the bobbin thread longer on the back.

Forgetting to backstitch at the beginning of a seam is just as important as forgetting at the end. Always backstitch when you start a new seam, right after you lower the presser foot and before you sew forward.

When you might skip backstitching

Backstitching is not necessary on seams that will be crossed by another seam. If you are sewing a side seam and then sewing an armhole seam that crosses it, the armhole stitching will lock the side seam in place. You can skip the backstitch on the side seam to save time.

You can also skip backstitching on temporary seams that you plan to remove later, like basting stitches that hold pieces in place before final sewing. These stitches are meant to come out, so locking them is pointless.

On very short seams — less than an inch — some sewers tie a knot instead of backstitching because there is not enough room to backstitch without going off the edge. A small knot works fine for these situations.

Frequently Asked Questions

What if I forget to backstitch and the seam starts to unravel?

You can fix it by hand. Thread a needle with matching thread, push it through the loop at the end of the unraveled seam, and tie a knot. Then weave the needle through a few threads on the back of the fabric to hide the knot. This stops the unraveling when ready, though it is not as strong as backstitching done during sewing.

Do I need to backstitch on both ends of every seam?

Yes, backstitch at the start and the end of every seam unless that end will be crossed by another seam. Seams that are crossed are locked in place by the crossing stitches, so backstitching is redundant.

Can I use a knot instead of backstitching on a machine?

You can tie a knot by hand after you remove the fabric, but backstitching is faster and creates a flatter, less visible finish. Knots can be bumpy and show through thin fabric. Backstitching is the standard method for machine sewing.

What stitch length should I use for backstitching?

Use the same stitch length you used for the rest of the seam. If you backstitched with a much longer or shorter stitch, the locked section will look different and may be weaker. Keep it consistent.

Does thread color matter when I backstitch?

No. The backstitching happens at the very edge of the seam, and on most projects it will not be visible once the garment is finished. Use whatever thread you are already using for the seam.