The Promise

Each mount board is crafted to standard proportions, with a slightly smaller aperture (window) to ensure a professional overlap when framed.

1. What’s the difference between A-sizes and inches?

A-sizes follow metric standards, while the US uses inches. Here’s a quick reference:

Size	Outer Dimensions		Aperture/Insert (Oval)		Aperture/Insert (Rectangular)
	Metric (mm)	Inches (approx.)	Inches (approx.)	Inches (approx.)	Inches (approx.)	Inches (approx.)
A5	148 × 210	5.8 × 8.3	98 x 145	3.9 × 5.7	98 x 145	3.9 × 5.7
A4	210 × 297	8.3 × 11.7	136 x 202	5.4 × 8.0	136 x 202	5.4 × 8.0
A3	297 × 420	11.7 × 16.5	192 x 285	7.6 × 11.2	192 x 285	7.6 × 11.2
A2	420 × 594	16.5 × 23.4	274 x 406	10.8 × 16	274 x 406	10.8 × 16

 

2. How do I choose the right frame size?

Select a frame that matches the outer mount size, not the picture opening. For example, an A3 mount board fits into an A3 (11.7 × 16.5 in) frame.

 

3. How much of my image will be visible?

Each mount board is cut to reveal slightly less of your picture (around 5–10 mm on each side) so the image stays perfectly secure and aligned. Here is a guide on which photo/document to pair with each mount  board size:

Size	Outer Dimensions		Recommended Photo/Document Size
	Metric (mm)	Inches (approx.)	Inches (approx.)
A5	148 × 210	5.8 × 8.3	4×6
A4	210 × 297	8.3 × 11.7	5×7; 6×8
A3	297 × 420	11.7 × 16.5	8.5×11
A2	420 × 594	16.5 × 23.4	12×15

 

4. Do you offer custom sizes?

Yes. We can produce bespoke mounts for any bespoke size of your choice. Please send an email to help@coeuretmaman.com or use the contact form HERE and we will create a bespoke size for you.

 

5. Where can I find frames to fit Coeur et Maman mount boards?

Frame availability varies by country and by mount board size.

For A-series mount boards, ready-made frames are widely available in the UK and many European markets and can be sourced from reputable home and lifestyle retailers.

In countries where A-series frames are less common (such as the US), we recommend working with a professional picture framer who can create a made-to-measure frames.

For non-A-series mount board sizes, standard ready-made frames are generally available in most countries and can be found in most quality frame and homeware shops without the need for custom framing.

At Coeur et Maman, we believe that memories should be held in pieces as timeless as the moments themselves.

Our mat boards are crafted with acid-free, archival, conservation-grade materials, chosen not only for their luxury but for their promise to keep your memories vibrant and beautiful through the years.

With colours that won’t fade and paper that resists yellowing, each piece becomes a lasting keepsake, carrying the warmth of today into the future. Let your family’s story be lovingly preserved in designs meant to hold treasured moments for generations to come.