Superfast multi-core batch image resizer and rotator.
Python Other Shell Makefile


Latest release AUR Debian Strech+ Ubuntu Zesty+ License


imgp is a command line image resizer and rotator for JPEG and PNG images. If you have tons of images you want to resize adaptively to a screen resolution or rotate by an angle using a single command, imgp is the utility for you. It can save a lot on storage too.

Powered by an intelligent adaptive algorithm, recursive operations, multiprocessing, shell completion scripts, EXIF preservation (and more), imgp is a very flexible utility with well-documented easy to use options.

imgp intends to be a stronger replacement of the Nautilus Image Converter extension, not tied to any file manager and way faster. On desktop environments (like Xfce or LxQt) which do not integrate Nautilus, imgp will save your day.

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Table of Contents


  • resize by percentage or resolution
  • rotate clockwise by specified angle
  • adaptive resize considering orientation
  • brute force to a resolution
  • optimize images to save more space
  • convert PNG to JPEG
  • erase exif metadata
  • force smaller to larger resize
  • process directories recursively
  • overwrite source image option
  • completion scripts for bash, fish, zsh
  • minimal dependencies

Adaptive mode

  • If the specified and image orientations are same [(H >= V and h > v) or (H < V and h < v)], the image is resized with the longer specified side as reference.
  • In case of cross orientation [(H >= V and h <= v) or (H < V and h >= v)], the image is resized with the shorter specified side as reference. Same as non-adaptive.

For example, if an image has a resolution of 2048x1365 and is being resized to 1366x768:

  • In regular mode (default), output image resolution will be 1152x768
  • In adaptive mode, output image resolution will be 1366x910


imgp could resize 8823 images (~4.5GB in size) of mixed resolutions (high to regular) stored in an external USB 2.0 hard disk at an adaptive resolution of 1366x1000 in around 8 minutes. The resulting size was 897MB (~ 20%).

imgp uses Python PIL/Pillow library. Nautilus Image Converter calls the convert utility from ImageMagick. For a comparative benchmark, head here.



imgp requires Python 3.5 or later.

To install PIL library on Ubuntu, run:

$ sudo apt-get install python3-pil

or, using pip3:

$ sudo pip3 install pillow

pillow can be replaced by pillow-simd on SIMD processors.

Installing from this repository

If you have git installed, run:

$ git clone

or download the latest stable release or development version.

Install to default location (/usr/local):

$ sudo make install

To remove, run:

$ sudo make uninstall

PREFIX is supported. You may need to use sudo with PREFIX depending on your permissions on destination directory.

Running as a standalone utility

imgp is a standalone utility. From the containing directory, run:

$ ./imgp

Installing with a package manager

Debian package

If you are on a Debian based system (including Ubuntu), visit the latest stable release and download the .deb package. To install, run

$ sudo dpkg -i imgp-$version-all.deb

Please substitute $version with the appropriate package version.

Shell completion

Shell completion scripts for Bash, Fish and Zsh can be found in respective subdirectories of auto-completion/. Please refer to your shell's manual for installation instructions.


cmdline options

usage: imgp [OPTIONS] [PATH [PATH ...]]

Resize, rotate JPEG and PNG images.

positional arguments:
  PATH                  source file or dir [default: current dir]

optional arguments:
  -h, --help            show this help message and exit
  -x res, --res res     output resolution in HxV or percentage
  -o deg, --rotate deg  rotate clockwise by angle (in degrees)
  -a, --adapt           adapt to resolution by orientation [default: off]
  -c, --convert         convert PNG to JPG format [default: off]
  -d, --dot             include hidden files (on Linux) [default: off]
  -e, --eraseexif       erase exif metadata [default: off]
  -f, --force           force to exact specified resolution [default: off]
  -i, --includeimgp     re-process _IMGP files. * RISKY: refer to docs
  -k, --keep            skip (but convert, if opted) images with matching
                        specified hres or vres or --res=100 [default: off]
  -n, --enlarge         enlarge smaller images [default: off]
  -p, --optimize        optimize the output images [default: off]
  -q, --quiet           operate silently [default: verbose]
  -r, --recursive       process directories recursively [default: off]
                        symbolic links to directories are ignored
  -w, --overwrite       overwrite source images [default: off]
  -z, --debug           enable debug logs [default: off]

Operational notes

  • Resize and rotate are lossy operations. For additional reductions in size try --optimize and --eraseexif options.
  • Output image names are appended with _IMGP if overwrite option is not used. By default _IMGP files are not processed. Doing so may lead to potential race conditions when --overwrite option is used.


  1. Convert some images and directories:

    $ imgp -x 1366x768 ~/ ~/Pictures/image3.png ~/Downloads/
    3840x2160 -> 1365x768
    11104999 bytes -> 1486426 bytes
    2048x1365 -> 1152x768
    224642 bytes -> 31421 bytes
    1920x1080 -> 1365x768
    2811155 bytes -> 1657474 bytes
    2048x1365 -> 1152x768
    224642 bytes -> 31421 bytes
  2. Scale an image by 75% and overwrite the source image:

    $ imgp -x 75 -w ~/image.jpg
    1366x767 -> 1025x575
    120968 bytes -> 45040 bytes
  3. Rotate an image clockwise by 90 degrees:

    $ imgp -o 90  ~/image.jpg
    120968 bytes -> 72038 bytes
  4. Adapt the images in the current directory to 1366x1000 resolution. Visit all directories recursively, overwrite source images, ignore images with matching hres or vres but convert PNG images to JPEG.

    $ imgp -x 1366x1000 -wrack
  5. Set hres=800 and adapt vres maintaining the ratio.

    $ imgp -x 800x0
    Source omitted. Processing current directory...
    1366x911 -> 800x534
    69022 bytes -> 35123 bytes
    1050x1400 -> 800x1067
    458092 bytes -> 78089 bytes


Copyright © 2016-2017 Arun Prakash Jana