Sewing Machine Stitches Puckering or Uneven - How to Fix It
If your stitches look uneven, wobbly or the fabric is gathering along the seam, it's almost always a tension or threading issue. Work through these steps and you'll have smooth, even stitches again in no time.
Work through these steps in order
Start at step 1 and work your way down - most people find the fix well before the end.
Re-thread the machine from scratch
Incorrect threading is the most common cause of uneven stitches. Even if the machine looks threaded correctly, a full re-thread is always worth doing first.
- Raise the presser foot before re-threading - this opens the tension discs so the thread seats properly
- Unthread completely and follow your machine's threading path carefully from the spool all the way to the needle
- Re-thread the bobbin too and check it's inserted correctly
Check thread tension
Upper tension that's too tight is the most common cause of puckering — it pulls the top thread taut and drags the fabric up along the seam.
- Start from the default or middle tension setting and test on scrap fabric, adjusting gradually in small increments
- If stitches are puckering, try easing the upper tension back slightly
- Make sure the top and bobbin threads are the same weight — mismatched threads create uneven tension and are a common overlooked cause
Check stitch length
A stitch length that's too short for the fabric can cause puckering, particularly on lightweight or delicate fabrics.
- Try lengthening the stitch slightly and testing on scrap fabric
- A good starting point for most fabrics is around 2.5mm - adjust from there based on fabric weight
Check the needle
A dull or incorrect needle drags through the fabric rather than piercing it cleanly, which can cause puckering and uneven stitch formation.
- Replace the needle with a fresh one - when in doubt, always put a new one in
- Make sure you're using the right needle type for your fabric - fine needles for lightweight fabrics, ballpoint for knits, sharps for woven fabrics
Check how you're handling the fabric
Pulling or pushing the fabric while sewing distorts the stitch length and can cause waviness or puckering along the seam.
- Let the feed dogs move the fabric at their own pace - don't push or pull
- Guide the fabric gently with your hands, keeping it flat and supported as it feeds through
- Make sure any excess fabric is resting on the table rather than hanging off the edge, as the weight can pull the fabric through unevenly
Consider your fabric type
Some fabrics are more prone to puckering than others and may need a slightly different approach.
- Lightweight and silky fabrics pucker easily - try a fine needle, lengthen the stitch slightly and use tissue paper or a stabiliser underneath for extra support
- Stretchy fabrics need a ballpoint or stretch needle and a slight zigzag stitch rather than straight stitch, which can break under stretch and cause puckering
Test on scrap fabric
Before returning to your project, test on a piece of scrap fabric of the same type. Check both sides - the top and underside should look even, with no loops, puckering or pulling in either direction.
Quick fix checklist
Run through this before contacting us - it covers the most common causes.
- Machine fully re-threaded with presser foot raised
- Top and bobbin threads are the same weight
- Thread tension set to default and adjusted gradually on scrap fabric
- Stitch length appropriate for fabric weight
- Needle is new and the correct type for the fabric
- Fabric being guided gently, not pushed or pulled
- Excess fabric supported on the table while sewing
- Stabiliser or tissue paper used under lightweight or slippery fabrics
Still having trouble? We're here to help.
If you've worked through all the steps and your stitches are still uneven or puckering, get in touch and our team will take it from there.
Still stuck? We are happy to help.
Our service team has seen every machine in our range and can usually diagnose problems over the phone.
