No image loaded — drop a JPEG/PNG anywhere, or click Load Image
Crop Tool
Drop an image here or click below
MOUSE
Click+DragPan image
ScrollZoom at cursor
Shift+ScrollRotate ±0.2°
CALIBRATION
CPlace calibration bar
Drag handlesRefine endpoints
FRAME & BAR
WFrame size (mm)
BScale-bar settings
KCurves (tone/colour)
TRotate image
1 / 2 / 3 / 4Snap bar to TL/TR/BL/BR
VIEW
FFit image to viewport
RReset pan/zoom
Shift+RReset everything
[ / ]Rotate −/+ 0.1°
0Rotation = 0°
EXPORT
EExport TIFF (2-page)
Ctrl+SSave state JSON
HToggle this help
XMirror horizontal
YMirror vertical
EscExit mode / close
[H] Help
Output dimensions
The output is the frame's content resampled to (mm × DPI / 25.4) pixels. Pan/zoom/rotate the image to place the region you want inside the frame.
Rotation
Tip: [ and ] for ±0.1° fine nudges.
Scale bar
Snap to corner:
Curves
Click to add a point. Drag to move. Double-click a point to remove. Endpoints can't be removed.
Drop image here
Calibration
You placed a bar of – pixels on the image. Enter the true physical length that bar represents on your sample:
Export TIFF
–
Output: 2-page TIFF. Page 1 = cropped base image. Page 2 = transparent RGBA overlay with the new scale bar. Open both in GIMP via File → Open as Layers. Physical resolution tags are written so the TIFF opens at the correct mm size.