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CENTERING LAB / LIVE TOOL

Measure the balance.

Upload a card temporarily, correct its crop and rotation, position four measurement guides and calculate left/right and top/bottom centering directly in your browser.

Open centering tool Read the guide
4 measurement positions per card
50/50 perfectly balanced borders
LOCAL temporary browser processing
Live centering analysis L/R 50/50 · T/B 50/50
Drag to rotate the card. Page scrolling remains available.
INTERACTIVE MEASUREMENT

Place the guides.
See the ratio.

Crop the photograph to the outside edge of the card. Then move the green guides to the inside printed frame or artwork boundary. The tool normalizes the opposite borders into percentages.

CENTERING WORKSPACE Temporary card measurement
Card for centering measurement Front measurement

Drag the four green lines or use the controls. The outside of the cropped photograph is treated as the outside edge of the card.

CENTERING KNOWLEDGE

Understand the border.
Understand the grade.

Centering compares the visible borders around the printed card design. Equal borders produce a 50/50 result; increasing imbalance moves the ratio toward values such as 60/40 or 70/30.

Centering percentage examples
VISUAL EXAMPLES

Compare 50/50, 60/40, 70/30 and 80/20.

The larger number represents the wider border in the measured pair. A 60/40 result means one side contributes 60 percent of the combined border width and the opposite side 40 percent.

Left and right centering measurement
LEFT / RIGHT

Measure opposite borders as one pair.

Add both border widths, then divide each individual border by that combined value.

THE FORMULA

From millimetres to percentages.

A left border of 3 mm and a right border of 2 mm have a combined width of 5 mm. The result is 3 ÷ 5 = 60% on the left and 2 ÷ 5 = 40% on the right.

border ÷ combined borders × 100 The same calculation is used for top and bottom.
Front L/R · Front T/B · Back L/R · Back T/B The limiting or less balanced pair is used as the side result.
RATIO REFERENCE

Line-count percentages

The table follows the same ratio logic as the printed centering reference. Green entries indicate 60/40 or better.

Card side 10 9 8 7
Front guide 60/40 65/35 70/30 75/25
Back guide 75/25 90/10 90/10 90/10
Centering measurement positions
MEASUREMENT LOCATIONS

Measure both directions on the front and back.

A card can be well centered left-to-right but less centered top-to-bottom. Both directions matter.

  • Front: compare the left border with the right border.
  • Front: compare the top border with the bottom border.
  • Back: repeat the left/right measurement.
  • Back: repeat the top/bottom measurement.
Card centering line reference chart
PRINTED REFERENCE

Odd and even guide lines convert to percentages.

Use the reference as a quick visual aid, then confirm the result with precise border placement in the tool.

  • Solid guide lines represent odd line counts.
  • Dashed guide lines represent even line counts.
  • Bold values indicate a 60/40 result or better.