Sewing box corners can elevate the look of your homemade bags, pillows, and DIY projects. They help create depth and provide a professional finish. Follow these 11 steps to learn how to sew box corners like a pro

1. Gather your materials: You’ll need fabric, matching thread, sewing pins or clips, measuring tape or a ruler, sewing scissors, and an iron.

2. Cut out the fabric: Measure and cut two pieces of fabric to the desired size for your project. Make sure both pieces have the same measurements.

3. Pin the fabrics together: Place the two pieces of fabric right sides together, aligning all edges evenly. Secure them with sewing pins or clips around the perimeter.

4. Sew around the edges: Using a straight stitch on your sewing machine or sewing by hand, sew around the edges of the pinned fabric with a consistent seam allowance. Leave an opening (about 4–6 inches) in one side for turning it right-side-out later.

5. Trim excess fabric: To reduce bulk in the corners, trim off any excess fabric beyond your seam allowance.

6. Create depth with box corners: Identify two opposite corners at the bottom of your project (for example, if you’re making a bag). Pinch each corner so that the side and bottom seams meet vertically at a right angle, forming a triangle shape.

7. Mark and measure: Measure the desired depth for your finished project (e.g., 2 inches for a small bag) from the pointed corner of each triangle along both seam lines. Mark this spot with a marker or pin.

8. Draw diagonal lines: Connect these marks on each triangle by drawing a straight line with your measuring tape or ruler as a guide. This diagonal line should run perpendicular to both seam lines to create equal-depth box corners.

9. Sew along these lines: Straight stitch across each diagonal line you drew, making sure to backstitch at the beginning and end for durability.

10. Trim excess material: Once both box corners have been sewn, trim off the excess fabric 0.5 inch from the seam lines.

11. Finish your project: Turn your project right-side-out through the opening you left earlier, using a tool like a chopstick or pencil to push out the corners. Iron it flat and sew the opening closed with a ladder stitch or invisible stitch.

Now you’ve successfully sewn box corners! With a bit of practice, this technique will become second nature for all your future sewing projects.