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What is the cardboard inside a picture frame called?

The thick material inside a picture frame is called a picture frame mat. It’s typically sturdy like cardboard, but it isn’t actually cardboard.

Crafted out of sturdy mat board material, picture frame mats are an easy way to highlight a framed photo, art print, or map. They are available in all sorts of colors, for any occasion, for any taste. Most picture frame inserts are made of out archival-quality, acid-free material, meaning they won’t yellow or fade the prints they frame.

Someone is holding a stack of colorful picture frame mats.
Sometimes called cardboard, picture frame mats are typically made of thick, acid-free material to frame and protect your photos or prints.

Why use picture frame mats?

Picture framing mats are an easy way to “dress up” a print you want to frame. Whether you choose a subtle 1″ border or something thicker, mats to frame photos add an upscale elegance to your framed photo.

Are some photo mats better than others?

The thickness and material of matting for frames can make a world of difference. Thin matting material doesn’t accent your photo as well as a thicker mat board. Where this really makes a difference is with the beveled edge. That angled edge gives your framed print that professional touch. How thick the mat board is defines how much of that beveled mat edge you see.

Another point to consider is that while most photo mats are made of acid-free material, not all are. Some mats are acid-resistant; they’re not acid-free, but have a coating to protect the prints from the acid of the board. Be sure to check before purchasing.

Close-up of the beveled edge detail of a cream-colored picture frame mat.
This mat board is 48pt thick and has a clean beveled edge to highlight your photo or art print.

What size frame mat should I buy?

There are two things you need to consider when buying mats for picture frames:

1. What size frame you need.

2. What size photo or print you want to frame.

To determine the outer size of the mat board, simply measure the glass or clear cover from the picture frame. That’s the outer dimension of your mat board.

To determine the inside size, measure your print. Keep in mind that most people who cut mat boards leave an overlap of no more than 1/4″ on all sides. This overlap helps hold the print in place and avoids any gaps between the print and mat when framing.

Can the picture cut-out be non-rectangular?

Absolutely! Most mat board cutters can cut custom frame mat shapes for any type of insert. We can even cut multiple openings in the frame matting. When you start with the uncut piece of mat board, the possibilities are endless. If you’re not sure where to buy picture frame mats, we can help.

We made a double-layered photo mat with a 4×6 photo window opening and a round opening to hold a medallion. The top mat is dimpled like a real golf ball, the bottom mat is a dark, forest green.

What about custom photo mat imprinting?

Adding your logo, design, or message to a frame mat is easy and adds that extra bit of personalization. It’s the perfect addition for frames that are being given as gifts, for framing diplomas or certificates, or even as a prize at a tournament or silent auction.

We can add a foil stamped imprint to any photo mat. While gold and silver imprints are the most popular, we have more than 20 foil colors to choose from.

Picture frame mats with foil stamped logos.
A sample collection of custom imprinted photo mats. From top: white on navy blue mat; gold on green mat; black on cream mat.

We can help with your photo mat needs.

Want to learn more? Read our beginner’s guide to mat board. Whether you need something completely custom, or are simply in need of a blank photo mat, we can help. Our USA-made picture frame mat inserts are available with low minimums and attentive customer service. Find your photo frame mat or give us a call at (800) 346-3063.

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