What “5% border” actually means
In white-border, the percentage is measured from the short side of the photo. A 5% border on a 4000 × 3000 image is 150 px on every side. The long edge gets the same 150 px, so the border looks even even though the photo is not square.
This is the same logic a print lab uses: the mat width is a physical distance, not a percentage of each edge.
A practical width table
| Width | Best for | Feel |
|---|---|---|
| 2–3% | Editorial, documentary, tight crops | Almost invisible; a clean edge |
| 5% | Default for web, portfolios, Instagram | Balanced; the photo still dominates |
| 8–10% | Gallery prints, posters, captions | Gallery mat; more breathing room |
| 12%+ | Polaroid-style, text-heavy borders | A design object, not just a photo |
Match the border to the frame
A wide border on a small photo can make the image feel lost. A narrow border on a large print can look like a printing error. The useful rule is to judge the border against the short side, then step back and look at the whole frame at the size it will be viewed.
- Square (1:1): 4–6% is usually enough. More than 8% starts to feel like a card.
- 4:5 portrait: 5–7% works well for Instagram; the extra height gives the eye room.
- 16:9 landscape: 3–5%; a wide frame with a thick border can feel like a letterbox.
- 2:3 or 3:4: 5–8% is the classic print range.
Instagram and social
Instagram displays a 4:5 portrait at roughly 1080 × 1350. A 5% border on that frame is about 54 px — visible but not heavy. If you add a border and then let the platform crop, the margins will look uneven. Export at the final aspect ratio, with the border already baked in.
For a grid, keep the same border width across a series. Consistency reads as a body of work; mixed margins read as screenshots.
For a 12 × 18 inch print, 5% of the short side is 0.6 inch — close to a standard mat. If the print will be framed, ask the framer for the mat opening before you bake in a border; the frame’s mat and the printed border can fight each other.
Leave a little more white on the bottom if the print will be signed. A 5% border with a 7% bottom edge is a classic photography-book proportion.
The one rule: keep it even
If you only remember one thing, make it this: all four sides should be measured from the photo edge, not from the canvas. A border that is 5% on the left and 7% on the right looks like a mistake, even if the difference is only a few pixels.
Try it on your own photo
Open the free editor, set the width to 5%, and compare it with 3% and 8%. The preview updates live, so you can judge the frame before exporting.