How to Fix Baseball Card Corners

Learn how to fix the corners of your baseball cards with these helpful tips.


cardboard corners. If your baseball cards have sharp corners, you can use a simple device to help round them out. This will not only make your cards look nicer, but it will also help to protect them from damage.

Here is what you will need:
-A corner rounder (available at any office supply store)
-A small, sharp knife
-A magnifying glass (optional)

First, locate the corner rounder in your office supply store. It should look something like this:

What Causes Baseball Card Corners to Curl?

One of the most common ways that baseball cards become damaged is when their corners start to curl. This can happen for a number of reasons, but most often it’s simply due to the card becoming old and brittle. If you have a collection of baseball cards that are starting to show their age, there are a few things you can do to try and restore them back to their original condition.

The first thing you’ll need to do is figure out what’s causing the corners to curl in the first place. If the cards are stored in a humid environment, this can cause them to warp. Similarly, if they’re stored in an environment that’s too dry, the corners can become brittle and break off. Once you know what’s causing the problem, you can take steps to fix it.

If the cards are stored in a humid environment, the best course of action is to move them to a drier location. This may not always be possible, but it’s worth trying if you want to preserve your collection. If the cards are stored in an environment that’s too dry, however, you’ll need to take steps to add moisture back into the air. This can be done by using a humidifier or by placing wet towels in the same room as the cards.

Once you’ve taken steps to fix the underlying problem, you can begin repairing damage that’s already been done. For minor damage, such as slight curling at the corners, you can try using clear tape or glue to fix the problem. If the damage is more severe, however, you may need to replace individual cards or even entire binders full of cards. No matter how bad the damage is, though, with a little patience and effort it’s often possible to restore your collection back to itsoriginal condition.

How to Prevent Baseball Card Corners from Curling

To prevent baseball card corners from curling, start by using a soft pencil to draw a line around the perimeter of the card. Then, use a sharp knife to make two cuts along the pencil line, being careful not to cut into the image on the front of the card. Next, bend the card back and forth along the cuts until it snaps in two. Finally, put the two halves of the card back together and hold them in place with tape or a paperclip.

How to Fix Baseball Card Corners that are Already Curled

The most common way to fix baseball card corners that are already curled is to carefully use a hobby knife to slice off the back of the corner. This will remove the glue that is causing the curling. You can then use a handheld stapler to reattach the corner. Be sure to use a light touch when stapling, as you don’t want to damage the card.


Once you have your new cards, it’s time to protect them. The three main ways to do this are to use penny sleeves, top loaders, or team bags. All of these will protect your cards from the elements and from being bent. If you want to display your cards, you can get a display case or frame them. Whichever way you choose to protect and display your cards, enjoy your collection!

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