Sewing & crafts
Picture frame mat layout
Preview an artwork opening with centred or bottom-weighted borders.
A clear answer. Here’s how.
Left/right borders divide the width difference equally. Top/bottom divide the height difference, with half the supplied bottom-minus-top weighting transferred from top to bottom. Rejects negative borders. SVG uses actual opening dimensions in mm; artwork overlap, bevel cut width and frame rebates must be included in the chosen dimensions.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Outer mat width (mm)
- 400
- Outer mat height (mm)
- 500
- Artwork opening width (mm)
- 250
- Artwork opening height (mm)
- 350
- Extra bottom border over top (mm)
- 10
Example result
- Left/right border (mm)
- 75
- Top border (mm)
- 70
- Bottom border (mm)
- 80
Bottom weighting is bottom-border minus top-border. Uses actual opening dimensions, without adding artwork overlap or frame rebates.