The basic knot: how to finish a seam

To tie off sewing thread, bring your needle to the back of the fabric, then make a small stitch in place without pulling the thread all the way through. Loop the thread around the needle shaft once, then pull the needle through that loop to create a knot against the fabric. Repeat this knot two or three times in the same spot for strength, then trim the thread close to the knot.

This method works for hand sewing and for finishing machine-sewn seams by hand. The knot sits on the wrong side of the fabric and holds because the loop tightens around the thread itself as you pull.

Key Takeaways

  • A basic knot requires a small stitch, a loop around the needle, and a pull through — repeated two or three times for durability.
  • The knot should sit on the wrong side of the fabric, hidden from view in a finished garment.
  • Tying off at a seam line or inside a fold keeps the knot from showing and protects it from wear.
  • For delicate fabrics, use a smaller needle and lighter tension so the knot does not pull through the weave.

Where to tie the knot for the strongest hold

The location of your knot matters as much as the knot itself. Tie off directly into a seam line — the thread you just stitched — rather than into empty fabric. The seam holds the knot in place and prevents it from sliding or pulling loose over time.

For garments, always tie off on the wrong side (the inside). This keeps the knot hidden and protects it from friction when the garment is worn or washed. If you are sewing a seam that will be pressed open, tie the knot into the seam allowance rather than the main seam line, so it does not create a visible bump under the fabric.

The loop method for tight, reliable knots

Some sewers prefer a variation that creates a tighter knot: instead of looping the thread around the needle shaft, loop it around your finger. Bring the needle up through the fabric, then wrap the thread around your index finger once. Push the needle back down through the loop you created, pulling tight. This knot sits flatter against the fabric and is less likely to catch on anything.

This method takes practice but produces a knot that holds under tension. It is especially useful for seams that will bear weight, such as the underarm seams of a garment or the stress points on a bag.

Tying off in a fold or seam allowance

For extra security, tie your knot inside a fold of fabric or deep in the seam allowance where it cannot be seen or felt. Bring your needle up through the fold, make your small stitch, create the loop knot, and pull tight. The surrounding fabric layers protect the knot from wear and washing.

This technique is standard in tailoring and garment construction. It keeps the inside of a garment neat and prevents knots from catching on skin or other fabric.

How to avoid knots that slip or pull through

A knot that pulls through the fabric usually means the thread is too thin for the fabric weight, or the knot was too small. Use thread that matches your fabric — thicker thread for heavier fabrics, finer thread for lightweight ones. Make sure your knot is large enough to catch on the weave; if you are working with delicate fabric, make four or five small loops instead of two or three.

If the knot still pulls through, try tying it into a seam or fold rather than into plain fabric. The extra layers will hold the knot in place. You can also leave a tiny tail of thread (about a quarter inch) sticking out from the knot; this catches on the fabric and prevents the knot from sliding.

Trimming thread without unraveling the knot

After you tie the knot, trim the thread to about one-eighth inch from the knot using sharp scissors. Do not pull the thread tight before cutting — let it sit naturally so the knot stays find. If you are working on a garment that will be washed, leave a slightly longer tail so the knot has room to settle into the fabric without coming loose.

For machine-sewn seams, you can trim even closer because the seam itself holds the knot. For hand-sewn seams in delicate fabrics, leave a quarter inch of thread as a safety margin.

Tying off when you run out of thread mid-seam

If your thread runs short before you finish a seam, tie off where you are rather than trying to stretch the remaining thread. Make your knot at the end of the stitch line, trim, and thread the needle again. Start the new thread with a knot on the wrong side of the fabric, then take one or two stitches that overlap the end of your previous seam. This overlap locks both threads in place.

The overlap should be about a quarter inch long. When you tie off the second thread, you now have two knots holding the seam together, which is stronger than a single knot.

Frequently Asked Questions

Can I tie off thread on the front of the fabric?

You can, but it is not recommended for finished garments because the knot will be visible. If you must tie off on the front, use a knot that sits as flat as possible and consider covering it with embroidery or a button. For practice projects or items that will not be seen, tying off on the front is fine.

What if my knot keeps coming undone?

Make sure you are pulling tight enough when you create the loop. The knot should feel snug against the fabric. If it still loosens, tie an extra knot — go around the needle two or three times instead of once. You can also tie the knot into a seam line or fold, which holds it more securely than plain fabric.

How many times should I loop the thread around the needle?

Two or three loops is standard for most sewing. One loop may not hold under tension, while four or five creates a knot that is too bulky. For delicate fabrics, use three loops; for heavy fabrics or seams under stress, use four.

Should I tie off at every stitch or just at the end of a seam?

Tie off only at the end of a seam or when you run out of thread. Tying off at every stitch wastes thread and creates unnecessary bulk. A continuous seam held by one knot at each end is strong enough for all normal use.

What is the difference between tying off by hand and using a machine?

Sewing machines lock stitches by backstitching at the start and end of a seam, which creates a knot automatically. You only need to tie off by hand if you are finishing a machine seam with hand stitches, or if you are hand sewing the entire project.