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If You Cut An LED Strip Will It Still Work? Easy Cutting Guide

Whether you’re looking to illuminate your kitchen cupboards or backlight your TV with LED strip lights, there’s a solution to everything.

Favored for their versatility, LED strips consist of a series of LED emitters installed onto a narrow, flexible circuit board.

There’s just one cause for concern. Most LED strips come as long reels between 3ft and 16ft in length. Will they continue to work if they are trimmed down?

Yes, LED strip lights will work after they’ve been cut as long as you cut them along the designated lines. LED strips are made up of several individual circuits, so each cut line demarcates the end of one circuit and the start of a new one. Cutting elsewhere on the LED strip will cause that circuit, and potentially the whole strip, to cease working.

Cutting along a straight line sounds simple enough, right? But you’d be surprised how many people get it wrong and wreck perfectly good lights in the process.

Keep reading for an easy-to-follow guide on cutting LED strip lights, reconnecting two separate pieces, and what to do if it all goes wrong.

Quick Guide To Cutting LED Strip Lights

Here is a quick guide if you are ready to cut your strips right away.

  1. Check that your LED strip light works
  2. Measure to the specific length that you want your light strip to be
  3. Look for the nearest cut line to this measurement on the strip. It will be a solid or dashed black line
  4. Using a knife or sharp scissors, safely cut the LED strip directly along this line

Let’s move on to more details.

Can You Cut LED Strip Lights?

Led strip is isolated on the white background

When it comes to LED strip lights, there is no ‘one size fits all.’ But whether you need lights that are flexible or rigid, monochromatic or RGB, waterproof or non-waterproof, most LED strips will have one thing in common… they can be cut to custom lengths.

Each LED strip light will have straight or dotted black lines at regular intervals.

Circuits are entirely closed at these specific points, so these are the safest places to cut your LEDs without causing any damage.

These cutting lines will be different on each strip light. But, as a general rule of thumb, they’re usually every 3 LEDs. So, for example, if there are 30 LEDs per meter, the cutting lines will typically be every 10cm – look for a line after the third LED light.

Copper soldering pads should form a symmetrical-looking pattern on each side of the black cutting line. Locating these copper pads is a handy tip to ensure that you’ve correctly identified the cutting line.

If You Cut LED Lights, Will Both Sides Still Work?

The short answer is yes. Both sides of your cut LED light strips will work once you cut them.

The reason lies in the cutting points. As I said earlier, the cutting point represents the safe place to disrupt the circuit without permanently damaging it.

Each section between the cutting points is the circuit on its own, so it doesn’t matter which cutting point you decide to use as long as this is the only place you do the cut.

This is definitely good news as you don’t create any more waste and you can still reuse your second half. You essentially get two light strips for the price of one and need to connect it to the power supply or buy a new plug.

How To Cut Strip Light Safely?

where to cut LED strip
Customizing the length of your LED strip lights is relatively straightforward. Here’s my step-by-step guide.

Start by testing your light strips to check that they work. This may seem obvious, but in most cases cutting or soldering lights will void your warranty, so it’s better to double-check.

Next, you’ll need to determine how long your LED strip needs to be. To do this, you should measure where you want the lights to go.

Be as accurate as you can with this. Then you’ll choose the cutting line on your LED strip closest to this measure length.

Cut precisely along the cutting line with a sharp knife or scissors. Take your time and remember that LED strips are designed to be cut, so you’re not going to get a shock.

The correct way to do it is with a really sharp pair of scissors – it’ll give the cleanest cut and won’t drag through the adhesive backing of the strip, making it peel. But you can use a sharp knife instead of scissors if you’re careful.

You’ll also need to decide how to connect the strip to the power source. Most reels come with a pre-fitted socket, but cutting down the LED strip removes this, so you’ll need to fit a new one.

You can choose between soldering a new socket onto the strip or using a strip power source connector (Amazon).

Can You Reconnect LED Strip That Has Been Cut Off?

LED strip light with scissors and transformer

What happens if you cut the strip too short? Can the two pieces be reconnected, or will you have to buy a new strip?

Provided that you cut along the designated cutting line, LED strips can be reconnected. You can take many approaches to reconnect the two pieces of strip lights.

The easiest one by far is to use a connector. Quick connectors are readily available from retailers just like this set on Amazon, and they come in a range of different shapes, namely right angles, and T-tap.

If you’ve cut in the wrong place, there’s no way to reconnect the two light strips.

How To Reconnect Cut Strip Lights

Light emitting diode strip

Here is a very brief guide, but I have an in-depth article that answers everything about connecting LED strip lights, so make sure to check it out.

Strip connectors are generally the most straightforward solution as they don’t require any tools. You need the correct connectors.

Start by using a knife to cut away the translucent plastic covering the copper pads.

Then, insert the strip into the connector, ensuring the components match up.

The second method is to solder directly to the strip using a soldering iron and old wires. Melt the solder directly onto the copper dots to form a small puddle and line up the polarity.

The black wire should line up with the negative mark, and the red line should line up with the positive mark.

Use wire strippers to strip around half an inch of casing off the end of your wires. Then, twist the end of the wire to join all the frayed ends and attach the wires to the solder puddles.

Once a connection has been established, you can plug your strip lights into a power source and check that they’re working. Voila! It’s that simple.

Troubleshooting: LED Strip Not Working After Cutting

Customizing the length of your LED strips may sound uncomplicated, but mistakes can happen, and your LED strip light might stop working correctly.

If your LED light strips aren’t working after being cut, check whether your lights were designed to be cut.

If they weren’t, but you still cut them anyway, then, unfortunately, the damage has been done. In these lights, the circuit runs continuously throughout the entire length, so cutting it has caused permanent damage.

If your LED strip light was designed to be cut, the second measure is to check you’ve actually cut them along the given cut lines.

Cutting outside the cut lines will kill that individual circuit, so you’ll have to trim back to the closest cutting line.

There are some other issues that you can notice, but they are not directly related to the cut but rather when you connect strips together.

If your LED strip setup is working but is a different shade of brightness at each end, you’re experiencing a voltage drop.

Generally, 12V LED strips should not exceed 10 feet, and 24V should not exceed 15 feet. Voltage drops can be prevented by reducing the strip length per power supply.

Alternatively, if your RGB LED strips are not changing color, this suggests that you’ve lined the polarities up incorrectly when connecting them. To ameliorate this, flip your strip around and reconnect it.

Final Words

There you have it! An LED strip light can be customized to meet the requirements of any installation, no matter how big or small.

So it’s no wonder they’re swiftly becoming the most popular form of LED lighting.

If you’re still unsure, it is possible to get LED strip lights cut by a professional, but if you follow my guide, I promise there is nothing to be scared of.

Have you ever tried cutting LED strips? Do you prefer to use a soldering iron or connectors? I’m keen to know which solution is more popular.