Overlocker basics for beginners
An overlocker (serger) trims, sews and wraps the seam edge in one pass using three or four threads. It's for finishing and sewing stretch seams, not for zips or topstitching.
Pinny's tip
Keep a sewing machine for everything else. An overlocker adds to it; it doesn't replace it.
Keep a sewing machine for everything else. An overlocker adds to it; it doesn't replace it.
What you'll need
- Overlocker: three or four thread.
- Four cones of overlocker thread: cheaper than spools.
- Tweezers: for threading.
Step by step
- Learn the parts: the two needles, the two loopers, the knife and the differential feed dial.
- Use the colour-coded threading guide inside the cover.
- Sew a test on a scrap and check all threads form neat loops on the edge.
- Feed fabric so the knife trims a few millimetres and don't pull it.
- Never run over pins; the knife will hit them.
- Chain off at the end and secure the tail with a knot or seam sealant.
Watch
Beginners Guide to Overlockers (24:33)
By Sew Essential · Open on YouTube
The video this technique page has always pointed to, a 24-minute one from Sew Essential. Embedded from YouTube with credit; we don't host it. It only loads when you press play.
Common mistakes
- Sewing over pins. Damages the knife and needles.
- Expecting it to do everything. Keep your sewing machine.
- Skipping tests. Every fabric needs a check.
Watch it done
- Beginners Guide to Overlockers by Sew Essential on YouTube. Opens on YouTube; the video belongs to its creator.
- How To Use An Overlocker (Are They Worth It??) | Sewing For Beginners - Episode 5 by Rosery Apparel on YouTube. Opens on YouTube; the video belongs to its creator.
Sources
All checked 1 November 2026. We read these; we did not test the products ourselves.