How do you tie off a string after sewing?

Do you need to tie off thread when sewing?

When you sew, there is both a starting and an ending point to a seam. To prevent those points from unraveling and stretching out of shape, you need to secure them with a back stitch or lock stitch. … In other cases, it is best to sew off the fabric, leaving a long tail of thread, and then knot the thread by hand.

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