Can you cut LED strip lights? Yes, but only at the marked cut points, unless the strip is a free-cut type. A standard strip is built in short sections, and cutting between the marks breaks a section so it stops lighting up.
This guide shows how to find the cut marks, cut safely, finish the end and reconnect pieces. It also lists the cut intervals on a range of ATOM LED strips, so you can plan your length before you order.
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What should you do for each strip type?
Use this quick guide, then read on for the reasons.
| Strip type | Can you cut it? | How to finish |
|---|---|---|
| Low-voltage strip (12V, 24V, 48V) | Yes, at the marked points | Cap or seal the end, or reconnect with a matching connector |
| RGB, RGBW or tunable white strip | Yes, at the marked points | Use a connector with the same number of pins |
| Free-cut COB strip | Yes, almost anywhere | Cap the end or connect with a COB connector |
| Waterproof or coated strip | Yes, at the marked points | Reseal the end with a matching end cap |
| Mains strip (220V to 240V) | Yes, at the marked points, with the power off | Cap the end, and ask an electrician to rejoin it |
| Strip with no marks and not sold as free-cut | No | Use it at full length |
Can you cut LED strip lights, and why only at the marks?
You can cut LED strip lights, but only at the cut points printed on the strip. The strip is wired in short groups of LEDs, and each cut point sits at the end of one group. Cut there and every group on either side keeps working. Cut anywhere else and the group you cut through goes dark.
- Why marks exist: they show where one small circuit ends and the next begins.
- Why it matters: a cut between marks can leave a dead section.
- The rule: always cut at a mark, never between two.
Marks protect the circuit, so respect them. The only exception is a strip made to be cut anywhere.
How do you find the cut marks?
Look along the strip for a scissor symbol or a dashed line, usually beside a pair of copper pads. The distance between marks changes from product to product, so check the cut interval for your strip before you plan a length.
| ATOM LED product | Cut interval |
|---|---|
| 220V to 240V COB strip, warm white 3000K | Every 10cm |
| 24V COB strip, 10mm, 480 LEDs per metre | Every 8.33mm |
| Tunable white CCT COB strip, 24V, 10mm | Every 50mm |
| Warm white neon flex, 48V, 6x12mm | Every 10cm |
| Addressable digital pixel RGB neon flex, 24V, 12x20mm | Every 8.5cm |
| Free Cut COB strip, 24V, 10mm | Cut almost anywhere |
Other ATOM LED strips have their own intervals, so always check the details on the product page.
Find the mark, then check the interval. A short interval lets you match a length closely, and a long one may mean rounding up or down.
Which LED strip lights can you cut?
LED strip lights you can cut are the ones with marked cut points, plus free-cut strip. Most low-voltage strips, RGB strips and neon flex are made this way. Rope-style lights with continuous wiring, and strips sold as a fixed sealed length, are built to be used whole.
- Can be cut: low-voltage strip, RGB, RGBW and tunable white strip, and neon flex, at their marks.
- Cut with extra care: mains strip, because the power must be off and the end must be sealed.
- Not designed to be cut: anything with no marks that is not sold as free-cut, or sold as a fixed, sealed length.
Can you cut LED strip lights anywhere?
Only if it is a free-cut strip. A free-cut COB strip is a strip built so that it can be cut at almost any point and still work, for installers and DIYers who need an exact length with little waste. Standard strips only work when cut at the marks.
Unlike a standard strip, where the interval can force you to round up or down, a free-cut strip lets you land on the length your shelf or cabinet needs. It is also dot-free COB, which suits visible runs. See our Free Cut COB strip range.
How do you cut LED strip lights safely?
Switch the power off first, then cut only at a mark with sharp scissors.
- Unplug the strip or switch off the power supply.
- Measure your run, then pick the cut mark just before the length you need.
- Mark the spot with a pencil.
- Cut straight through the middle of the mark, across the copper pads, with sharp scissors or a craft knife.
- Seal or cap the cut end so it stays clean and safe.
- Connect the strip, switch on and check that every section lights.
If the strip sits in an aluminium channel, cut the channel and cover to the same length, and slide the cover out before you saw the metal. Our LED strip profiles have channels for different strip widths.
Power off, cut at the mark, seal the end and test. Those four steps prevent most failures.
How do you plan your length before you cut?
Work out the length you need, then round down to the nearest cut mark. Rounding down is safer than rounding up, because you cannot add length without a connector.
- Example, 10cm interval: a 1.43m shelf needs 1.4m of strip, which leaves 3cm short of the edge.
- Example, 8.33mm interval: the same shelf takes 171 sections, about 1.42m, so the strip nearly fills it.
- Leave room for the end cap: an end cap adds a few millimetres, so subtract that from the space.
The shorter the interval, the closer the fit. Check the interval first, then choose the strip.
What happens if you cut in the wrong place?
The section you cut through usually stops working, and the part beyond it may not light at all. You can often fix it by cutting back to the next mark.
- A dead section: trim back to the nearest mark and test again.
- Part of the strip dark: the circuit may be broken. Cut back to a clean mark.
- If in doubt: check the cut interval for your strip before you cut again.
How do you reconnect cut LED strip lights?
You can reconnect a cut piece with a clip-on connector, a short length of wire soldered to the pads, or a jumper. The connector must match the strip's width and number of pins. Browse our COB strip connectors.
- Single colour strip: a 2-pin connector.
- Tunable white strip: a 3-pin connector.
- RGB strip: a 4-pin connector.
- RGBW strip: a 5-pin connector.
- Match the width: a connector for 10mm strip will not fit a different width.
- Mains strip: do not rejoin it yourself. Ask a qualified electrician.
Match the pins and the width, and a cut piece works like new. Never join mains strip yourself.
Do you need to seal a cut end?
Yes, for waterproof and outdoor strip. A cut end lets in dust and moisture, so it needs a matching end cap. Fit it before the strip goes outside or near water. Indoor strip also looks neater with a cap, so browse our front and end caps.
What mistakes do people make when cutting?
- Cutting with the power on: always switch off first.
- Cutting between marks: it leaves a dead section.
- Not checking the interval: the strip may be longer than you planned.
- Leaving the end open: dust and moisture can get in.
- Rejoining a mains strip yourself: this is unsafe.
Most errors come from skipping the interval check. A minute of planning saves a strip.
Everything you need to cut and finish a strip
Choose a strip that suits your length, then add the parts that finish the job.
Frequently asked questions
Can you cut LED light strips to any length?
Only to a length that ends at a cut mark, unless the strip is free-cut. If the marks are close together, you can fit a length closely. If they are far apart, you may need to round up or down.
Can you cut waterproof or RGB LED strip?
Yes, at the marks. Reseal the end of waterproof strip with an end cap, and use a connector with the right number of pins for RGB or RGBW.
Can you reuse the piece you cut off?
Yes, if it still has its cut mark and a way to connect power, such as a connector or soldered wires.
Do you need to turn the power off before cutting?
Yes. Always unplug the strip or switch off the power supply first.
Can you cut a mains LED strip?
Yes, at the marked points, with the power off and the strip unplugged. Seal the cut end with a matching cap. Do not rejoin it yourself, because mains wiring needs a qualified electrician.
Can you cut LED strip lights to suit your space? Yes, at the mark, or almost anywhere with free-cut strip. For help choosing a cut interval for your project, call 01952 370028 (Monday to Friday, 9am to 5pm) or email sales@atomled.co.uk.