Utility to shrink Pi disk images
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Drew Bonasera 4f61a3244a
Merge pull request #123 from daveilers/daveilers-sysprep-1
2 weeks ago
LICENSE Initial Commit 3 years ago
README.md Update README.md 2 months ago
pishrink.sh Add sysprep-ish steps 2 weeks ago



PiShrink is a bash script that automatically shrink a pi image that will then resize to the max size of the SD card on boot. This will make putting the image back onto the SD card faster and the shrunk images will compress better.


sudo pishrink.sh [-sdrzh] imagefile.img [newimagefile.img]
  -s: Skip autoexpand
  -d: Debug mode on
  -r: Use advanced repair options
  -z: Gzip compress image after shrinking
  -h: display help text

If you specify the newimagefile.img parameter, the script will make a copy of imagefile.img and work off that. You will need enough space to make a full copy of the image to use that option.

  • -s will skip the autoexpanding part of the process.
  • -d will create a logfile pishrink.log which may help for problem analysis.
  • -r will attempt to repair the filesystem if regular repairs fail
  • -z will Gzip compress the image after shrinking. The .gz extension will be added to the filename.


If you are trying to shrink a NOOBS image it will likely fail. This is due to NOOBS partitioning being significantly different than Raspbian’s. Hopefully PiShrink will be able to support NOOBS in the near future.

If using Ubuntu, you will likely see an error about e2fsck being out of date and metadata_csum. The simplest fix for this is to use Ubuntu 16.10 and up, as it will save you a lot of hassle in the long run.


wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
chmod +x pishrink.sh
sudo mv pishrink.sh /usr/local/bin


[user@localhost PiShrink]$ sudo pishrink.sh pi.img
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/loop1: 88262/1929536 files (0.2% non-contiguous), 842728/7717632 blocks
resize2fs 1.42.9 (28-Dec-2013)
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/loop1 to 773603 (4k) blocks.
Begin pass 2 (max = 100387)
Begin pass 3 (max = 236)
Begin pass 4 (max = 7348)
The filesystem on /dev/loop1 is now 773603 blocks long.

Shrunk pi.img from 30G to 3.1G


If you find a bug please create an issue for it. If you would like a new feature added, you can create an issue for it but I can’t promise that I will get to it.

Pull requests for new features and bug fixes are more than welcome!