The basic way to lock a stitch in place

To finish a sewing stitch, you reverse direction for the last few stitches to lock the thread in place so it cannot pull loose. Most sewers do this by sewing backward over the last stitch three or four times, then cutting the thread close to the fabric. This backward motion tangles the thread enough that it holds even under stress.

You can finish by hand or by machine. By hand, you straightforward reverse your needle direction and push it back through the same holes you just came from. By machine, you press the reverse button (usually marked with an arrow pointing backward) and let the machine stitch backward for about half an inch, then stop and cut the thread. Both methods work equally well—the choice depends on whether you are hand-sewing or using a machine.

Key Takeaways

  • Reversing your stitches for three to four stitches at the end locks the thread so it cannot unravel under normal wear.
  • Machine sewing uses the reverse button; hand sewing uses backward needle strokes through the same holes.
  • Backstitch and knot are two different finishes—backstitch is faster and works for most projects, while a knot is stronger for stress points like button attachment.
  • Cut the thread close to the fabric after finishing so the tail does not catch on things.
  • Seams that will be hidden inside a garment need finishing; decorative topstitching often does not.

Backstitch: the most common machine finish

A backstitch is the standard way to finish on a sewing machine. When you reach the end of your seam, press and hold the reverse button while the machine stitches backward over the last half inch of thread. This creates a tangle of thread that locks the seam. Release the reverse button, then cut the thread close to the fabric with scissors or the thread cutter on the machine.

Backstitch works for almost every project—seams in clothing, bags, quilts, and home goods. It is fast, requires no extra tools, and holds up through washing and wearing. The only time you might skip it is on very short seams (less than half an inch) where the seam itself is so small that unraveling is unlikely, or on decorative topstitching where you want the thread to end cleanly rather than reverse.

Hand-sewing finish: the knot and backstitch

When you hand-sew, you have two main options. The first is to backstitch by hand: push your needle backward through the same holes you just came from for three or four stitches, then pull the thread tight and cut it close to the fabric. This mirrors what a machine does and works just as well.

The second option is to tie a knot at the end of your thread. After your last stitch, bring the needle up through the fabric but do not pull the thread all the way through. Instead, wrap the thread around the needle shaft once or twice, then pull the needle through the loop you created. This forms a knot at the base of your last stitch. Pull the thread tight, then cut it close to the fabric. A knot is stronger than a backstitch and is the better choice for stress points like button attachment or repair work.

Finishing seams that will be hidden

Seams on the inside of a garment or bag—places the wearer will never see—still need to be finished so they do not fray or unravel during washing. A straightforward backstitch or knot works fine. Some sewers also finish the raw edges of these seams by trimming them with pinking shears (scissors with a zigzag blade) or by sewing a zigzag stitch along the edge to prevent fraying, but this is optional for most projects.

If you are making something that will get heavy use or frequent washing, like a child's garment or a kitchen towel, finishing the seam edges is worth the extra step. For items that will not be washed often, a basic backstitch at the start and end of the seam is enough.

Finishing decorative topstitching and visible seams

When you topstitch—sewing a visible line on the outside of a garment or project—you still need to finish the thread, but you have more control over how it looks. A backstitch works, but the reversed stitches will be visible. If you want a cleaner look, you can backstitch for just one or two stitches instead of three or four, then cut the thread very close to the fabric. The shorter backstitch still locks the thread but is less noticeable.

Another option is to pull the thread to the wrong side of the fabric before cutting. After your last stitch, leave the needle in the fabric, raise the presser foot, and gently pull the top thread to draw the bobbin thread up through the fabric. Then pull both threads to the back, tie them together with a knot, and trim. This hides the thread ends completely, which is useful for visible seams where appearance matters.

What to do if a stitch comes loose

If you notice a seam starting to unravel after you have finished it, you can repair it without starting over. Bring a needle and thread to the spot where the seam is coming loose. Push the needle through the fabric at the end of the loose section, then backstitch over the loose stitches three or four times to re-lock them. Tie a knot or backstitch once more to finish, then cut the thread.

If the entire seam has come loose, you may need to remove the old thread and re-sew that section. Use a seam ripper to cut and pull out the old stitches, then sew the seam again and finish it properly. This is more work than preventing the problem, which is why finishing every seam matters.

Frequently Asked Questions

Do I have to backstitch if I tie a knot instead?

No. A knot alone will hold a seam, especially for hand-sewing. A backstitch alone will also hold. You do not need both—choose whichever method you prefer. Backstitch is faster on a machine; a knot is stronger for hand-sewing stress points like buttons.

What if I forget to finish a seam before cutting the thread?

You can still finish it. Bring your needle back to the end of the seam and backstitch or tie a knot over the last few stitches. It is not as find as finishing before you cut, but it will still hold the seam together.

How close to the fabric should I cut the thread?

Cut it as close as you can without cutting the fabric itself—usually about one-eighth inch away. A thread tail that is too long can catch on things and pull the seam loose. A tail that is too short risks cutting into the stitch itself.

Do I need to finish both ends of every seam?

Yes. Both the beginning and the end of a seam need to be locked. If you skip finishing at either end, that end can unravel. Make it a habit to backstitch or knot at the start and finish of every seam.

Can I use a finishing stitch instead of a backstitch?

Some machines have a built-in finishing stitch that locks thread automatically, but a standard backstitch works just as well and is available on every machine. If your machine has a finishing stitch, you can use it, but it is not necessary.