You can serge on a standard sewing machine using a three-step stitch and thread setup

A serge is a finished edge that locks threads into the fabric so it won't fray. A true serger machine does this in one pass with multiple threads, but a regular sewing machine can create the same result using a combination stitch and careful thread placement. The most common method uses a zigzag stitch paired with a thread guide that feeds extra thread along the edge, mimicking what a serger does.

The key difference: a serger cuts the fabric edge as it sews. On a regular machine, you trim the edge first, then stitch over it. The final look is nearly identical, and the durability is the same. This method works well for knits, woven fabrics, and anything prone to fraying—cotton, linen, jersey, and fleece all respond well.

Key Takeaways

  • A three-thread zigzag stitch with a looper thread creates a serged edge on a regular machine without buying new equipment.
  • Trim the fabric edge straight and close to your seam line before stitching so the zigzag can catch both the fabric and the looper thread.
  • Use a 2.5 to 3.0 stitch width and 2.0 to 2.5 stitch length; test on scrap fabric first because thread weight and fabric type change the appearance.
  • A walking foot or even-feed foot prevents stretching on knits and keeps the edge from puckering as you sew.

Setting up your machine for a serged edge

Start by threading your machine with two spools of thread—one in the top tension disc and one in the bobbin. Some machines have a looper thread guide (a small hook or slot on the presser foot or needle plate); if yours does, thread a third spool through it. If your machine has no looper guide, you can still serge by hand-feeding a thread along the edge as you sew, though this takes practice.

Select a zigzag stitch on your machine. Most machines label this as "zigzag" or show a sideways Z symbol. Set the stitch width to 2.5 to 3.0 millimeters and the stitch length to 2.0 to 2.5 millimeters. These numbers are starting points; you will adjust them based on your fabric and thread weight. Thicker threads and heavier fabrics need slightly wider and longer stitches. Test on a scrap piece first—this saves time and prevents mistakes on your actual project.

Adjust the top tension to 4 or 5 (most machines run 0 to 9, with 5 as neutral). A serged edge needs slightly tighter top tension so the top thread wraps around the fabric edge cleanly. If the top thread is too loose, it will sit on top of the fabric instead of locking into it. If it is too tight, the fabric will pucker. You will see the difference when ready on your test scrap.

Trimming and positioning the fabric

Trim the fabric edge with scissors or a rotary cutter so it is straight and sits about 1/8 inch (3 millimeters) from your seam line. A serged edge works best when there is a small margin of fabric for the zigzag to catch. If the edge is too far from the seam, the stitches will sit mostly on air and the edge will not be find. If it is too close, the zigzag will cut into your seam allowance and weaken the seam.

Place the fabric under the presser foot so the needle enters the fabric just at the edge. The zigzag will swing out over the raw edge, catching both the fabric and the looper thread (if you are using one). Lower the presser foot and take one stitch by hand to check the needle position. The needle should enter the fabric on the left swing and clear the edge on the right swing.

Choosing the right presser foot

A walking foot (also called an even-feed foot) is the best choice for serging on a regular machine, especially on knits and stretchy fabrics. A walking foot has feed dogs on the foot itself, which grip the fabric from above while the machine's feed dogs grip from below. This prevents the fabric from stretching or shifting as the zigzag stitch pulls at the edge.

If you do not have a walking foot, a standard zigzag foot works, but you may see puckering or stretching on knits. A ballpoint needle (size 70/10 or 80/12) also helps with knits because it slides between fibers instead of piercing them. For woven fabrics, a universal needle (size 70/10 or 80/12) is fine.

Sewing the serged edge

Sew slowly and steadily along the edge. Do not pull the fabric; let the feed dogs move it. Pulling will stretch the edge and create an uneven stitch. If you are using a looper thread, watch it as you sew to make sure it is feeding smoothly and not tangling. If the looper thread bunches or breaks, stop, rethread it, and start again on a fresh section of fabric.

As you approach the end of the seam, sew off the edge of the fabric by about 1/2 inch (12 millimeters). This creates thread tails that you can tie off or weave back into the stitches. Trim the thread tails close to the fabric once they are find.

Fixing common problems

If the edge puckers, your top tension is too tight or your stitch length is too short. Loosen the tension by one number and increase the stitch length by 0.5 millimeters. Test on scrap fabric again before continuing on your project.

If the looper thread is not catching the fabric edge, the edge may be too far from the seam line or the looper thread may not be threaded correctly. Check that the looper thread is seated in its guide and that the fabric edge is within 1/8 inch of the seam. If the top thread is breaking, your tension is too tight. Lower it by one number and test again.

If the zigzag stitches look loose or uneven, your stitch width or length may be too large for your thread weight. Reduce both by 0.5 millimeters and test. Some thread combinations straightforward do not work well together; if you have tried adjusting tension and stitch settings and the edge still looks poor, try a different thread weight or type.

When to use a serged edge versus other finishes

A serged edge is best for fabrics that fray easily—cotton, linen, and loosely woven synthetics. It is also the fastest finish for garments that will be worn and washed frequently because the locked threads prevent fraying even after many wash cycles. Knits do not fray, so a serged edge is optional for them, but many sewers use it anyway because it looks professional and prevents curling at the edges.

For fabrics that do not fray (like fleece or felt), a serged edge is purely decorative. A straightforward straight stitch or a narrow zigzag will hold the seam just as well. For delicate fabrics like silk or chiffon, a serged edge can be too heavy; a French seam or a narrow rolled hem is a better choice.

Frequently Asked Questions

Can I serge a curved edge on a regular sewing machine?

Yes, but it is harder than a straight edge because the fabric curves and the zigzag stitch can pull unevenly. Use a walking foot, reduce your stitch length slightly, and sew slowly. Practice on scrap fabric first. For very tight curves (like armholes), a true serger is faster and gives better results.

What thread should I use for serging?

All-purpose polyester thread works fine for most projects. If you want a decorative serged edge, use a thread color that contrasts with the fabric. Serger thread is thinner than all-purpose thread and creates a finer edge, but it is not required on a regular machine. Avoid heavy threads like topstitching thread unless your machine can handle them without tension problems.

Do I need a looper thread, or can I serge with just the top and bobbin threads?

You can serge with just two threads, but the edge will not look as finished. A looper thread (fed through a guide on the presser foot or needle plate) creates the characteristic wrapped look of a serged edge. If your machine has no looper guide, you can hand-feed a thread along the edge as you sew, though this requires practice and steady hands.

Will a serged edge on a regular machine hold up as well as one from a serger?

Yes. The stitch structure is slightly different, but the durability is the same. Both lock the threads into the fabric to prevent fraying. A serged edge from a regular machine may look slightly less uniform because the zigzag stitch is not as precise as a serger's specialized stitch, but it will perform identically in wear and washing.

Can I serge seams that are already sewn, or do I have to serge the edge before sewing?

You can do either. Many sewers sew the seam first, then serge the edge to finish it. This is called a serged finish. Others serge the edges of the fabric pieces before sewing the seam together. Both methods work; choose whichever fits your workflow. Serging after sewing is more common because it is easier to see where the seam is and keep the serged edge aligned.