ImageMagick is a powerful open-source command-line tool suite for displaying, converting, and manipulating raster image files.
Common Operations
Resizing Images
magick input.jpg -resize 800x600 output.jpg # Fit within 800x600 maintaining aspect ratio
magick input.jpg -resize 800x output.jpg # Specific width, auto height
magick input.jpg -resize x600 output.jpg # Specific height, auto width
magick input.jpg -resize 800x600\! output.jpg # Force exact dimensions (distorts ratio)
magick input.jpg -resize 50% output.jpg # Scale by percentage
Cropping & Transformations
magick input.jpg -crop 400x300+10+10 output.jpg # Crop width x height + x_offset + y_offset
magick input.jpg -gravity center -crop 400x400+0+0 output.jpg # Center crop square
magick input.jpg -flip output.jpg # Flip vertically
magick input.jpg -flop output.jpg # Flop horizontally (mirror)
magick input.jpg -rotate 90 output.jpg # Rotate clockwise 90 degrees
magick input.jpg -trim output.jpg # Automatically trim edges
Batch Format Conversion
# Convert all PNG files in directory to JPG
magick mogrify -format jpg *.png
# Convert single image format
magick photo.png photo.webp
PDF Generation
# Combine multiple images into a single PDF document
magick page1.jpg page2.jpg page3.jpg document.pdf
# Convert multi-page PDF pages into PNG images
magick -density 300 document.pdf -quality 100 page_%02d.png