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oam/knowledge base/compare two pdf files.md
2023-07-09 18:00:36 +02:00

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# Compare two PDF files
Install and use [`diffpdf`][diffpdf] (preferred) or [`diff-pdf`][diff-pdf]:
```sh
sudo pacman -S diffpdf
sudo zypper install diff-pdf
```
```sh
diffpdf file1 file2
```
As an alternative:
```sh
# create a pdf with the diff as red pixels
magick compare -verbose -debug coder $PDF_1 $PDF_2 -compose src /tmp/$OUT_FILE.tmp
# merge the diff-pdf with background PDF_1
pdftk /tmp/$OUT_FILE.tmp background $PDF_1 output $OUT_FILE
```
## Further readings
- [`diffpdf`][diffpdf]
- [`diff-pdf`][diff-pdf]
- [ImageMagick]
- [`pdftk`][pdftk]
## Sources
- [Compare PDF Files With DiffPDF]
- [PDF compare on linux command line]
<!--
References
-->
<!-- Knowledge base -->
[diffpdf]: diffpdf.md
[diff-pdf]: diff-pdf.md
[imagemagick]: imagemagick.md
[pdftk]: pdftk.md
<!-- Others -->
[compare pdf files with diffpdf]: https://www.linuxandubuntu.com/home/compare-pdf-files-with-diffpdf-in-ubuntu-linux-debian-fedora-other-derivatives
[pdf compare on linux command line]: https://stackoverflow.com/questions/6469157/pdf-compare-on-linux-command-line#7228061