Observed arrival · 2026-11-08
Mat & Margin’s mat-opening planner
An independent planning aid that explains mat measurements, calculates a worked paper-to-window example, and helps users check which artwork details remain visible.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People measuring artwork for a custom mat
- Worth noticing
- Its 8 × 10-inch example subtracts 1/8 inch of coverage from each edge to show a 7 3/4 × 9 3/4-inch window.
Field notes
The worked example distinguishes coverage hidden by the opening from the border running between the opening and the board edge. The site also advises measuring signatures and other edge details separately, and checking whether a supplier’s form expects the artwork size or exact window size. Its source section is dated November 6, 2026, and says supplier policies are examples rather than universal specifications.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue