The basic knot: securing your thread at the end of a seam
When you finish a seam by hand, you need to lock the thread so it does not unravel. The simplest way is a knot at the base of your last stitch. Bring your needle to the back of the fabric after your final stitch, then make a small loop with the thread. Pass the needle through that loop and pull tight. This creates a knot that sits right where your stitching ends, holding everything in place.
The knot should be small and close to the fabric surface. If it is too large or sits away from the material, it can catch on things or work loose over time. Practice making the loop small enough that the knot itself is barely visible when you look at the back of your work.
Key Takeaways
- A basic knot at the base of your final stitch is the fastest way to find thread and works for most hand-sewing projects.
- The knot should sit as close to the fabric as possible so it does not catch or come loose during wear or washing.
- A backstitch followed by a knot creates extra security for seams that will get heavy use, like on bags or upholstery.
- Burying the knot inside a fold or seam allowance hides it completely and protects it from snagging.
- Different fabrics and projects may call for different knot placements, but the basic technique stays the same.
The backstitch-and-knot method for stronger seams
If your seam will take stress—a bag handle, a cushion cover, or a repair on work clothes—reinforce the knot with a backstitch first. After your final stitch, bring the needle forward about one-eighth of an inch, then push it back through the same hole you just came out of. This creates a short stitch that overlaps your last one. Then tie your knot right at that point.
The backstitch does two things: it locks the thread direction so it cannot slip backward, and it gives the knot something solid to grip. On heavy fabrics or seams that will flex, this extra step can mean the difference between a repair that lasts and one that comes apart after a few washes.
Hiding the knot inside seams and folds
For a finished look, you can hide the knot entirely by tying it inside a seam allowance or fold. After your final stitch, push the needle into the fold of fabric—the space between two layers or inside a hem—and bring it out a quarter-inch away. Tie your knot inside that fold, then pull the needle back through the fold to hide the knot completely.
This method takes a few extra seconds but leaves no visible knot on either side of your work. It is especially useful on visible seams, hems, or any project where appearance matters. The knot sits protected inside the fabric, where it cannot snag or come loose.
Tying off when you run out of thread mid-seam
Sometimes you need to tie off before you reach the end of a seam—your thread is running short, or you are switching colors. Use the same basic knot technique: bring the needle to the back, make a small loop, pass through it, and pull tight. Then start a new thread by bringing the needle up through the same hole or very close to it, so the new thread picks up right where the old one stopped.
The two knots will sit near each other on the back of the fabric. Make sure both are tight and close to the surface. If there is a gap between where you tied off and where you started again, the seam can separate at that point, so overlap your stitches slightly when you resume.
Adjusting your knot for different fabrics
Delicate fabrics like silk or lightweight cotton need smaller, tighter knots because the thread can pull through the material if the knot is too loose. On these fabrics, make your loop very small and pull hard when you tighten it. You may also want to use the buried-knot method so the knot sits inside a fold rather than sitting on the surface where it could catch.
Heavy fabrics like denim, canvas, or upholstery can handle larger knots and more tension. You can tie a slightly bigger knot and pull harder without worrying about damaging the material. On these fabrics, a backstitch before the knot is especially worthwhile because the extra security prevents the knot from working loose over time.
Common mistakes that cause knots to fail
The most common problem is a knot that sits too far from the fabric. If there is a gap between the knot and the surface, the thread can slip through that gap when the seam gets pulled or washed. Always tie your knot as close to the fabric as you can, with the loop small enough that the finished knot is nearly flush with the material.
Another mistake is tying the knot too loosely. A loose knot can slip through the fabric or unravel when the seam gets stress. Pull hard when you tighten the loop—harder than feels necessary at first. The knot should not move when you tug the thread gently.
Finally, do not tie the knot in mid-air away from the fabric. Always bring your needle to the back of the work first, then make the loop and tie it right there. This ensures the knot sits where it belongs and cannot slip.
When to use a double knot for extra security
A double knot—tying the basic knot twice in succession—adds security without much extra effort. After you tie your first knot, do not cut the thread yet. Instead, make another small loop and tie a second knot right on top of the first one. This is useful on seams that will get heavy wear, like the crotch seam on pants or the stress points on a bag.
Double knots are also a good choice if you are working with slippery thread, like rayon or polyester, which can work loose more easily than cotton. The extra knot gives the thread nowhere to go. On most everyday projects, a single knot is enough, but the double knot takes only a few seconds and can extend the life of a repair or garment.
Frequently Asked Questions
Should the knot be on the front or back of the fabric?
Always tie the knot on the back of the fabric, where it will not be visible in the finished project. If you are sewing a seam that will be seen from both sides, bury the knot inside a fold or seam allowance so it is hidden completely.
What if my knot keeps coming loose?
Your knot is probably too loose or too far from the fabric. Pull harder when you tighten it, and make sure the loop is small and sits right against the fabric surface. A backstitch before the knot also helps prevent slipping, especially on stretchy or delicate materials.
Can I use the same knot technique on all types of thread?
The basic technique works for all thread, but slippery threads like rayon or polyester benefit from a double knot or a backstitch first. Cotton and regular sewing thread hold a single knot reliably. Test your knot by pulling the thread gently—it should not move at all.
How close to the fabric should the knot actually be?
The knot should sit as close to the fabric surface as possible, ideally with no visible gap between the knot and the material. If you can fit a needle tip in the space, the knot is too far away and may slip through the fabric under stress.
Is it better to bury the knot or leave it on the surface?
Burying the knot inside a fold or seam allowance is better for durability and appearance, but it takes a few extra seconds. For everyday projects, a surface knot close to the fabric works fine. For visible seams or items that will get heavy use, take the time to hide it.