How to cut a mirror: A step-by-step guide

As simple as they are, mirrors help brighten a room by reflecting light off different surfaces. Plus, they’re useful when you need to fix your outfit or hair. But if you suddenly find yourself bored with your old ones and don’t want to buy new styles, don’t worry. You can make it yourself by getting a mirror cut! Make this your new DIY project by learning how to cut a mirror below. 

What do I need to cut a mirror?

Can you cut a mirror without breaking it? Unfortunately, that’s not possible. Mirrors are made of glass, and the only way to separate one part from another is by breaking it. You can do it cleanly as long as you have these tools. 

• Gloves - You’ll be handling an object with sharp edges; protecting your hands is vital.

• Safety glasses or goggles - This will prevent microscopic pieces of glass from getting into your eyes.

• Black marker - Perfect for noting where you want to cut your mirror!

• Straight edge - It will be your guide when cutting the mirror.

• C-clamp or heavy object - This will stop your mirror from moving around while you’re scoring it.

• Glass cutting oil - Not only will this protect your glass cutter, but it will also help produce cleaner cuts.

• Glass cutter (or Diamond-tipped scribe) - The main tool that will change the shape of your mirror.

• Mini hammer - To help further break the mirror.

• Newspapers - To protect the surface you’re working on.

How to cut glass mirrors

If you’re already wondering how to cut a mirror at home, follow these seven steps to get the shape and size you desire.

Step 1: Clean and dry the mirror

Mirrors can accumulate dirt, oil, grime, and other dust particles through the years. Before starting the cutting—or scoring—process, squirt some rubbing alcohol over it and wipe it off using a microfibre towel. Wait a few minutes for it to dry.

Step 2: Put on protective gear

You’ll be handling sharp objects, so it’s best to be safe with goggles and gloves. If wearing large rubber gloves makes it harder to hold the mirror, try surgical or latex gloves. It won’t be as thick, but there will still be a layer of protection for your hands.

Step 3: Set the mirror down and measure

Planning to cut your mirror on your dining table? Avoid damaging it by placing three to four layers of newspaper on top. Gently set it down on the surface to prevent random cracks or breaks in the mirror.

Using a straight edge and a marker, note the measurements of the new mirror. Put tiny marks on where you intend to cut your mirror. Don’t mark the whole mirror, as you might have difficulty erasing it. Small marks on the top and bottom will do!

Step 4: Use the straight edge as a scoring guide

Take the straight edge and line it up against the measurements. A straight edge can be like a piece of plywood. Since you didn’t mark the whole mirror, this will guide you on where to score. 

Mirrors are extremely smooth, so you don’t want your straight edge moving around while cutting it up. With a C-Clamp or heavy object, like a paint can or a book, weigh both edges of the plywood to stop it from moving.

Step 5: Squirt a few drops of glass cutting oil where the cut will begin

Squeeze a few drops of glass cutting oil on your starting point down to the end so breaking the glass is easier and smoother. Cutting oil is usually made of mineral oil and other water-based lubricants.

Step 6: Take your glass cutter or scribe, and start cutting

With a bit of pressure, press your glass cutter down on the starting point and roll it to the end. It’s important to add pressure as this will force the blade to break the glass and that you make one continuous score to prevent overlaps, which could lead to an uneven cut.

Step 7: Lift your mirror and gently tap on the score

Once you’re done scoring, lift the mirror slightly and tap the back of the cut with a small hammer. The taps and the mirror’s weight will force the crack to run the entire length. The result? A new mirror shape for you to use!

Give your mirror a revamp

With a complete list of tools and tips, you can be your own professional handyman. Remember, always wear safety goggles or glasses and rubber gloves; use glass cutting oil to prolong the life of your scorer; and if you don’t want to ruin the surface you’ll be working on, stack newspapers below the mirror to avoid knicks, scratches, and cuts. 

Still scared to cut your mirrors? That’s okay; pros are willing to do it for you. Sign up on Airtasker today and find the perfect mirror-cutting expert for your needs and budget.