What a slip stitch is and why you use it

A slip stitch is a hand-sewing technique that closes an opening with nearly invisible stitches. The needle runs inside the fold of fabric on one side, then pops out and slides through the fold on the opposite side. Because the thread stays hidden inside the fold, the seam looks like it sealed itself.

You use slip stitch to close openings after you have stuffed a pillow, closed a seam on a garment after turning it right-side out, or attached an appliqué patch so the edge looks finished. It is the standard way to close a gap without the stitches showing on the outside.

The stitch works on any fabric, but it shows least on medium-weight materials like cotton, linen, and blends. On very thin fabric or knits, the thread can still be slightly visible if you pull too tight. On heavy fabric like canvas or denim, you may need a stronger needle and more patience.

Key Takeaways

  • Thread your needle with a single strand about 18 inches long, knot one end, and hide the knot inside the fold by bringing the needle out through the fold itself.
  • Insert the needle directly across from where it came out, slide it inside the fold for about a quarter inch, then pop it back out and cross to the opposite side.
  • Keep your stitches small and your thread tension loose enough that the fabric lies flat—pulling too tight will pucker the seam.
  • After every four or five stitches, gently tug the thread to close the gap, then continue stitching until the opening is sealed.

Threading and anchoring your needle

Cut a length of thread about 18 inches long. Use thread that matches your fabric color as closely as possible—if the thread does show, it will blend in. If you cannot find an exact match, choose a shade slightly darker rather than lighter, because darker thread is less noticeable.

Thread the needle and tie a knot at one end. Bring the needle up through the fold of fabric from the inside, so the knot stays hidden in the fold. This is your starting point. The thread should come out right at the edge where the opening begins.

If you are closing a seam on a stuffed item like a pillow, position the opening so it faces you. If you are attaching an appliqué, work along the edge you want to seal. Either way, start at a corner or an inconspicuous spot in case your first few stitches are not perfectly hidden.

Making the basic slip stitch

Once your needle is anchored in the fold, insert it directly across from where it came out—into the fold on the opposite side of the opening. Push the needle straight in, parallel to the edge.

Slide the needle inside the fold for about a quarter inch (roughly the width of your pinky fingernail). The needle stays inside the fold the whole time; it does not pierce through to the outside. Then push the needle back out through the fold, so the thread emerges on the surface again.

Now cross back to the first side. Insert the needle into the fold directly across from where it just came out. Slide it a quarter inch inside the fold, then pop it back out. You are creating a zigzag pattern, but because the needle travels inside the fold, the thread stays hidden.

Repeat this motion—in one fold, slide, out; across to the other fold, in, slide, out—moving steadily along the opening. Your stitches should be small and evenly spaced. Aim for stitches about a quarter inch apart.

Keeping tension loose and closing the gap

The most common mistake is pulling the thread too tight. If you yank the thread after each stitch, the fabric will bunch and pucker, and the seam will look gathered instead of flat. Instead, keep the thread loose and relaxed as you stitch.

After every four or five stitches, gently tug the thread to draw the opening closed. You should feel the gap narrow, but the fabric should still lie flat. If it starts to pucker, you are pulling too hard—loosen up and take smaller stitches instead.

As you work, the opening will gradually seal itself. The thread stays hidden because it runs inside the fold, so from the outside, it looks like the seam closed on its own. This is why slip stitch is used on visible seams where you do not want stitches to show.

Finishing and hiding your final knot

When you reach the end of the opening, take one final stitch and bring the needle out through the fold. Do not cut the thread yet. Instead, make a small loop with the thread, insert the needle through the loop, and pull tight to create a knot. This knot should sit right at the edge, inside the fold.

Slide the needle back into the fold and run it inside the fold for about half an inch, then bring it back out and cut the thread close to the fabric. The thread will disappear into the fold, and the knot will stay hidden inside.

Step back and look at your work. The opening should be sealed, and the stitches should be nearly invisible from the outside. If you see thread on the surface, it means either your stitches were too loose (the thread poked through) or your thread color did not match well enough. Both are fixable on your next project.

Common problems and how to fix them

If your seam is puckering, you are pulling the thread too tight. Undo the last few stitches, loosen your tension, and try again with a gentler hand. Slip stitch works best when the fabric stays relaxed.

If you can see the thread on the outside, either your thread color does not match or your needle is piercing all the way through the fold instead of staying inside it. Make sure the needle stays inside the fold the entire time—it should only come out at the edges where you want it to.

If your stitches are very large and uneven, slow down and focus on keeping them small and consistent. Smaller stitches are easier to hide and create a neater seam. It is better to take twice as many small stitches as to rush through with large ones.

If the opening is not closing, you may not be pulling the thread tight enough after every few stitches. Gently tug the thread periodically to draw the gap closed as you work. Do not wait until the end to pull—close the gap gradually as you go.

When to use slip stitch versus other sealing methods

Slip stitch is the best choice when you need the seam to be invisible or nearly invisible from the outside. Use it to close pillows, stuff toys, seal appliqués, and close seams on garments after turning them right-side out.

If the seam will be hidden (like the back seam of a pillow that will sit against a wall), you can use a ladder stitch instead, which is slightly faster because you can take longer stitches. Ladder stitch works the same way but with bigger gaps between stitches, so it closes faster but is slightly less invisible.

If you are sewing a seam that will be seen and does not need to be invisible, use a running stitch or backstitch on a sewing machine instead. Those are faster and stronger for seams that will take wear and tear. Slip stitch is best for finishing work where appearance matters and the seam will not be under stress.

Frequently Asked Questions

Can I use slip stitch on a sewing machine?

No, slip stitch is a hand-sewing technique only. Machines cannot replicate the motion of running the needle inside a fold. Some machines have a blind-stitch setting that mimics the look, but it is not true slip stitch and works differently.

What thread should I use?

Use regular sewing thread that matches your fabric color. All-purpose polyester or cotton thread works fine. You do not need special thread for slip stitch. A single strand is all you need—do not double it up, because that makes the thread thicker and more visible.

How long does it take to close a pillow opening with slip stitch?

A 4-inch opening on a standard pillow usually takes 10 to 15 minutes once you have the technique down. Speed comes with practice. Your first attempt may take longer, but the stitch becomes faster as you get comfortable with the motion.

Will slip stitch hold if the seam gets pulled or stressed?

Slip stitch is strong enough for pillows and decorative items, but it is not as strong as a machine-sewn seam. If the item will be handled roughly or washed frequently, reinforce the slip stitch by running a second row of stitches inside the seam, or use a machine stitch instead.

What if I run out of thread before the opening is closed?

Tie off your thread inside the fold, then thread a new needle and anchor it in the fold near where you stopped. Continue stitching from that point. The overlap will be hidden inside the fold, so it will not show on the outside.