How to Hem Jeans and Keep the Original Hem Intact

New jeans that are 5 cm too long either drag on the ground or get rolled into a bulky cuff. A normal hem fixes the length but loses the faded, slightly twisted factory edge that makes denim look like denim. The good news is that you can hem jeans and keep the original hem with a home machine, a denim needle and about 40 minutes.

I have shortened dozens of pairs this way for friends and for my own family, including on a basic machine that had never seen anything thicker than cotton poplin. Here is the full method, plus the mistakes that make the result look homemade.

What you need to hem jeans this way

• A denim or jeans needle, size 100/16 or 110/18. A universal needle will skip stitches or snap at the side seams.
• Polyester all purpose thread that matches the denim body, not the gold topstitching.
• A tape measure, chalk or a washable marker, and 6 to 8 pins or clips.
• A zipper foot. It lets you stitch tight against the bulk of the old hem.
• Sharp fabric scissors and an iron set to cotton with steam.

If your machine has struggled with thick layers before, read why a sewing machine tension problem is rarely the machine first. Most denim trouble comes from the needle and thread rather than the machine itself.

Measure the right length first

Wash and dry the jeans before measuring if they are new and not pre shrunk. Raw or rigid denim can shrink 3 to 7 percent in length, and that can turn a perfect hem into ankle swingers.

Put the jeans on with the shoes you will wear most. Fold the hem under until it sits where you want it, usually just touching the top of the shoe at the front with a small break, and pin it. Then measure the amount you folded under. Say it is 5 cm.

Here is the important step. Divide that amount in half. You will fold a tuck of 2.5 cm, because a tuck takes up twice its own depth.

Measure each leg on its own

Most people have one leg a few millimetres longer than the other, and factory hems are not always identical either. Pin both legs while wearing the jeans, take them off, and measure each fold separately. If the difference is 5 mm or less, use the average for both legs so the hems look even when you stand straight. If it is more than that, keep the two measurements and write them on a scrap of paper pinned to each leg. It sounds fussy, but it takes two minutes and saves you from the classic result where one leg breaks neatly on the shoe and the other hangs above it.

Step by step: hem jeans and keep the original hem

Step 1: fold the tuck

Turn the leg right side out. Fold the original hem upward onto the outside of the leg so that the fold sits 2.5 cm above the bottom edge of the hem. Measure all the way round in four or five places, because a tuck that wanders by even 3 mm shows on the finished leg. Pin or clip it in place.

Step 2: stitch beside the old hem

Fit the zipper foot and set a stitch length of about 3 to 3.5 mm. Stitch around the leg as close as you can to the bottom edge of the original hem, roughly 1 to 2 mm below it. Go slowly over the side seams. If the machine hesitates, turn the handwheel by hand for those few stitches rather than forcing it with the pedal.

Step 3: check the length

Before you cut anything, fold the tuck down so the old hem hangs below the new stitching, and try the jeans on. This is your last chance to adjust. If the length is wrong, unpick that one line of stitching and try again.

Step 4: trim and finish the raw edge

Trim the excess fabric inside the tuck, leaving 1 cm above the stitching. Finish that raw edge with a zigzag or an overlocker so it does not fray in the wash.

Step 5: press and topstitch

Fold the seam allowance up inside the leg so the original hem hangs down, and press hard with steam. For a cleaner look, topstitch through the denim just above the seam line with matching thread, catching the seam allowance underneath. This keeps the allowance flat and stops the hem from rolling.

The counter-take: do not always match the gold thread

Most tutorials tell you to buy gold topstitching thread so your new stitching blends in with the jeans. I usually do the opposite, and here is why.

The only new stitching that shows from the outside is the topstitch line in step 5, and it sits on the blue denim body, not on the original hem. Gold thread draws the eye straight to it, because it looks like an extra row of factory stitching in the wrong place. Thread matched to the denim body practically disappears. Use gold only if you are doing a full new hem with no original edge.

The same principle applies to all invisible repairs, which I cover in more detail in mending a garment so the repair does not show.

Common problems and how to fix them

The last one catches people out. On skinny or tapered jeans, the leg gets narrower toward the ankle, so the original hem is narrower than the leg at your new length. For tucks under 4 cm this rarely matters. For bigger changes, ease the leg into the hem as you stitch, or narrow the inside seam by a few millimetres just above the tuck.

Keep the strips you cut off. Hemmed offcuts with the original edge are perfect for pocket trims and handles, as in our guide to upcycling old jeans into a sturdy tote bag.

Frequently asked questions

Can you hem jeans without a sewing machine and keep the original hem?

Yes, though it takes longer. Use a backstitch with strong thread and a heavy hand needle, keeping stitches around 3 mm long. Expect about an hour per leg, and use a thimble because denim side seams are tough on fingers.

How much can you shorten jeans with the original hem method?

There is no strict limit, since the excess is cut off. The practical issue is leg width on tapered styles. Removing more than about 8 cm from skinny jeans can make the original hem visibly narrower than the leg above it.

Will the new seam show after washing?

A small ridge just above the hem is normal and becomes less obvious after a few washes as the denim softens. Pressing hard, trimming the allowance to 1 cm and topstitching with matching thread keeps it flat and discreet.