The basic sewing knot secures your thread so it does not pull through the fabric
A sewing knot is a small loop you tie at the end of your thread before you start stitching. It sits on the back of your fabric and keeps the thread from sliding out as you sew. The most common knot takes about three seconds and works for hand sewing, mending, and most embroidery.
You tie it after you thread your needle but before you push the needle through the fabric for the first time. If you skip the knot, your first few stitches will come loose, and your seam or repair will unravel.
Key Takeaways
- A sewing knot is tied at the end of your thread before you start stitching, and it prevents the thread from pulling through the fabric.
- The standard method involves wrapping thread around your needle, sliding the loop down, and pulling tight — it takes three steps and works every time.
- You can tie the knot at the end of your thread or use a loop method if you prefer not to cut the thread short.
- A knot that is too loose will slip through; a knot that is too tight can break the thread or damage delicate fabric.
- Once you finish a seam, you tie off on the back of the fabric with a small stitch and knot to lock the thread in place.
The standard three-step knot
Hold the needle in one hand and the thread in the other. Wrap the thread around the needle once, close to the eye (the hole at the top where the thread goes through). The thread should make a single loop around the shaft of the needle.
Pinch the loop between your thumb and index finger and slide it down the needle toward the end of the thread. Keep pinching as you slide so the loop stays tight. When the loop reaches the end of the thread, it will form a small knot.
Pull the thread taut to tighten the knot. The knot should be about the size of a small pea — large enough that it will not slip through your fabric, but small enough that it does not create a visible bump on the front of your work.
How to tie off when you finish stitching
When you reach the end of a seam or repair, you need to lock the thread so it does not unravel. Bring your needle to the back of the fabric and make one small stitch in place — push the needle through the fabric and back out in nearly the same spot, leaving a tiny loop of thread on the back.
Pass the needle through that loop and pull tight. This creates a knot on the back of the fabric. Repeat this step one more time for extra security, especially on seams that will get a lot of wear.
Trim the thread close to the knot with scissors. Leave about a quarter-inch of thread so the knot does not come undone.
The loop method if you do not want to cut the thread
Some sewers prefer not to cut the thread short at the end. Instead, after you thread the needle, fold the thread in half so both ends are together. Tie a knot at the folded end — this creates a loop of thread with a knot at the bottom.
Push the needle through the fabric as usual. The knot at the end of the loop will catch on the back of the fabric and hold. When you finish stitching, tie off the same way you would with a single thread.
This method uses more thread but gives you a thicker knot that is less likely to slip through loosely woven fabrics.
Common mistakes that make knots fail
A knot that is too loose will slide through the fabric on your first stitch, and you will have to start over. If your knot keeps slipping, wrap the thread around the needle twice instead of once before you slide the loop down. This creates a slightly larger knot.
A knot that is too tight can break the thread or snap off before you even start stitching. If the thread breaks when you pull the knot tight, you wrapped it too many times or pulled too hard. Use a single wrap and pull with steady pressure, not a sudden jerk.
Tying the knot too far from the end of the thread leaves a long tail that gets in the way. Tie it as close to the end as you can while still being able to hold the thread with your fingers.
Knots for different fabric types
Delicate fabrics like silk, chiffon, or linen can be damaged by a large knot. For these materials, tie a smaller knot by wrapping the thread only once around the needle and pulling gently. You may need to make the knot slightly larger than usual to prevent it from slipping through, but avoid making it so large that it leaves a permanent dent in the fabric.
Heavy fabrics like denim, canvas, or upholstery can hold a larger knot without damage. You can wrap the thread around the needle twice if you want extra security, or tie a double knot by repeating the wrapping step.
Stretchy fabrics like knit or jersey are prone to runs, so use a slightly larger knot than you would for woven fabric. The extra size helps prevent the thread from pulling through as the fabric moves.
Practice tips for consistent knots
The first few times you tie a sewing knot, it may feel awkward or take longer than three seconds. This is normal. Practice tying knots on a scrap of thread before you start an actual project so you can get the motion into muscle memory.
If you struggle to pinch the loop and slide it down at the same time, try laying the needle on a flat surface and rolling the loop down with your fingers instead. This gives you more control and is easier on your hands if you sew for long periods.
Keep your thread tension consistent. If you pull the loop down too fast, it may slip. If you pull too slowly, the knot may come loose. Aim for a steady, even motion.
Frequently Asked Questions
What if my knot comes undone while I am stitching?
Stop and tie a new knot at the end of the thread you have already sewn. Push the needle back through the fabric near the last stitch, make a small loop on the back, pass the needle through it, and pull tight. This locks the thread in place and prevents the seam from unraveling further.
Can I tie a knot with a double thread?
Yes. Fold the thread in half, thread both ends through the needle, and tie a knot at the folded end. This creates a thicker knot and uses twice as much thread, but it is stronger and less likely to slip through loose fabric.
Do I need a knot if I am using a sewing machine?
No. Sewing machines lock the thread automatically through tension and stitching. You start and end by backstitching — holding the reverse button for a few stitches — instead of tying a knot. Hand sewing always requires a knot.
How do I remove a knot if I made a mistake?
Use a seam ripper or small scissors to carefully cut the knot away from the thread. If the knot is already tied into your fabric, gently work it loose with a needle or tweezers. Avoid pulling hard, which can damage the fibers.
What thread size works best for knots?
Standard sewing thread (all-purpose polyester or cotton) ties easily and holds well. Thicker threads like embroidery floss create larger knots that are visible on delicate fabric. Thin threads like beading thread can be harder to knot but work for fine detail work.