Drop to load the image
Ruler
Drag on the image to measure

ImgDewarp

Straighten an image of flat objects using four markers. Runs entirely in your browser; your image never leaves your device.

1 Markers

Print the marker sheet, or show the markers on a tablet. Place your objects between the four markers.

Printable sheet (PDF) Screen markers

A4 landscape. Print at 100%. Printing larger (e.g. A3) works too: measure the lines on the sheet in the Scale step.

2 Image

Take a photo with all four markers in view, then load it. It's straightened and cropped automatically.

Or drop it on the image area.

3 Adjust

Untick to see the original image with the detected markers.

Keeps the area between the markers' outer corners.

Rotate (clockwise)
Flip

4 Scale

Measure the two lines on the marker sheet or screen (they run between the markers' outer corners) and enter them for exact proportions and a real-world scale. The examples are the A4 sheet printed at 100%.

×

5 Export

Load an image first.

Advanced

Enter the width and height in step 4 first: without a real-world size there's no DPI to set.