Bias binding is sewn in two stages: attaching it to the fabric edge, then folding and stitching the folded edge down

Bias binding is a strip of fabric cut at a 45-degree angle to the grain. When you sew it, you first stitch the binding to the front of your fabric, then fold it to the back and stitch it down by hand or machine. The fold hides the raw edges of both the binding and your fabric, which is why binding lasts longer than a straightforward hem and looks finished on both sides.

You can buy pre-made binding (usually cotton or polyester, folded and pressed already) or cut and fold your own. Pre-made binding is faster if you are new to this. The method is the same either way: measure your edge, pin the binding on, sew it, then fold and stitch the back.

Key Takeaways

  • Bias binding is sewn in two passes: first to the front of the fabric with a straight stitch, then folded to the back and stitched down by hand or machine.
  • Pre-made binding is already folded and pressed, so you can start sewing when ready without cutting or ironing your own strips.
  • The seam allowance on the first pass should match the width of the folded binding edge so the back fold covers your stitching line.
  • Hand-stitching the back fold takes longer but gives you control over tension and is easier on delicate fabrics; machine-stitching is faster and holds up better in the wash.
  • Corners and curves need the binding clipped or eased so it folds flat without puckering or bunching.

What you need before you start

Gather a measuring tape, pins, scissors or rotary cutter, and thread that matches your binding or fabric. If you are using pre-made binding, you are done with tools. If you are cutting your own, you also need a ruler, rotary cutter, and self-healing mat, plus an iron to press the folds.

Measure the perimeter of the edge you are binding. If you are binding an armhole, measure around the armhole. If you are binding a neckline, measure around the neck opening. Add 2 inches to account for overlap at the seam where the ends meet. Buy or cut that length of binding.

Pre-made binding usually comes in packages of 2.5 yards or 5 yards. Standard width is 1.25 inches when folded. If your pattern calls for a different width, check the package label or cut your own strips to that width, then fold and press them before sewing.

Attaching binding to the front of your fabric

Lay your fabric flat with the edge you are binding facing you. Unfold one long edge of the binding (the edge closest to you). Pin the unfolded binding to the right side of your fabric, raw edges aligned. The binding should sit flat against the fabric with no twists or bunches.

Set your machine to a straight stitch, length 2.0 to 2.5 mm. Use a seam allowance that matches the width of the folded binding edge—usually 0.25 inches for standard pre-made binding. Sew slowly, keeping the binding and fabric edges aligned. Backstitch at the start and end.

When you reach a corner or curve, stop with the needle down, lift the presser foot, and pivot the fabric so the binding follows the new direction. Lower the presser foot and continue. If the binding does not lie flat around a curve, stop and clip into the seam allowance of the binding (not the fabric) every 0.5 inches so it spreads and folds smoothly.

When you reach the end of the edge, overlap the binding ends by 0.5 inches and trim the excess. Fold the overlapping end under and pin it, then sew across the overlap to find it. Press the seam flat with an iron on medium heat.

Folding the binding to the back and hand-stitching

Fold the binding to the back of the fabric so the folded edge of the binding covers your stitching line. Pin it in place every 2 to 3 inches. The fold should sit exactly over the line where you stitched on the front—if it is too far forward or back, the stitching will show on the finished side.

Thread a needle with thread that matches the binding or fabric. Use a slip stitch (also called a ladder stitch or blind stitch): bring the needle up through the fold of the binding, then insert it directly across into the fabric, travel inside the fabric for 0.125 inches, and come back out. Go back into the binding fold and repeat. The thread stays hidden inside the fold and fabric.

Work slowly and keep your stitches small—about 0.125 inches apart. Pull the thread snug but not tight, or the binding will pucker. Hand-stitching takes 20 to 40 minutes for a typical neckline or armhole, depending on the length and your speed.

Folding the binding to the back and machine-stitching

Fold the binding to the back of the fabric and pin it so the folded edge sits just over your stitching line. Press with an iron to set the fold. Machine-stitching works best when the fold is creased and stays in place.

From the front of the fabric, sew in the ditch—the groove where the binding meets the fabric. Use a straight stitch, length 2.0 mm, and thread that matches the binding. Sew slowly and keep the needle in the groove so the stitching stays hidden. Backstitch at the start and end.

The stitching line on the back will sit slightly below the fold of the binding, which holds the fold down and secures it. This method is faster than hand-stitching and creates a strong seam that holds up through many washes. It works well on quilts, bags, and garments that get heavy use.

Handling corners and curves

At a right-angle corner (like the corner of a quilt or the corner of a pocket), stop sewing 0.25 inches before the corner. Lift the presser foot, pivot the fabric 90 degrees, and continue sewing. The binding will fold naturally at the corner and lie flat on both sides.

On an inside curve (like an armhole), clip into the seam allowance of the binding every 0.5 inches, stopping just short of your stitching line. The clips let the binding spread so it does not bunch when you fold it to the back. On an outside curve (like a rounded neckline), ease the binding gently as you sew so it curves smoothly without puckering.

After you fold the binding to the back, the clipped sections will overlap slightly. Pin them so they lie flat, then stitch them down. The overlaps are normal and will not show on the finished side.

Finishing the seam where binding ends meet

When you sew the binding all the way around an edge, the two ends of the binding will meet. Overlap them by 0.5 inches, fold the top end under, and sew across the overlap on the front. When you fold the binding to the back, the overlap will sit on top of itself, which is fine—just stitch it down like the rest of the binding.

If you want a less bulky join, you can sew the binding ends together before attaching them to the fabric. Lay the two ends right sides together, sew them with a 0.25-inch seam, trim the seam allowance, and press it open. Then attach the joined binding to your fabric as usual. This method takes a little longer but creates a flatter seam.

Frequently Asked Questions

Can I use bias binding on a straight edge?

Yes. Bias binding works on any edge—straight, curved, or cornered. The advantage of bias is that it stretches slightly, so it conforms to curves without puckering. On a straight edge, it is purely decorative or protective, but it still works the same way.

What if my binding is too narrow or too wide for my seam allowance?

If the binding is too narrow, your stitching line will show on the back when you fold it over. If it is too wide, you will have extra fabric bunching on the back. Cut or buy binding that is at least twice the width of your seam allowance. Standard 1.25-inch binding works with a 0.25-inch seam allowance.

Do I have to press the binding before I sew it?

Pre-made binding is already pressed, so no. If you cut your own, pressing the folds before you sew makes the binding easier to handle and keeps it from shifting. Use a medium-heat iron and press gently so you do not distort the bias.

Can I machine-stitch the binding on both sides?

Yes. Sew the binding to the front, fold it to the back, press it, then sew in the ditch from the front. This is faster than hand-stitching and creates a strong, durable seam. The back stitching line will be slightly visible but sits below the fold, so it is less noticeable than a front seam.

What do I do if the binding twists or bunches as I sew?

Stop, lift the presser foot, and smooth the binding flat. Reposition the pins so the binding lies straight and flat against the fabric. On curves, clip the seam allowance of the binding more often—every 0.25 inches instead of 0.5 inches—so it spreads evenly and does not bunch.