MAT(1) Metadata Anonymisation Toolkit


mat [options] files


The Metadata Anonymisation Toolkit is a lib (with a CLI and a GUI) created to anonymise file's metadata. In essence, metadata answer who, what, when, where, why, and how about every face of the data that are being documented. They can be a risk for privacy.


-h, --help
show this help message and exit
-a, --add2archive
Add to outputed archive non-supported filetypes
-b, --backup
Keep a backup copy
-c, --check
Check if a file is free of harmful metadatas
-d, --display
List all the harmful meta of a file without removing them
-l, --list
List all supported fileformat
-L, --low-pdf-quality
Reduced the produced PDF size and quality
-v, --version
Display version and exit


mat --display mydocument.pdf
Display the mydocument.pdf's harmful metadata
mat --check *.jpg
Check all the jpg images from the current folder


MAT only process metadata, it does not handle file data. Blame yourself if you are traced back because of the data of your files. MAT is not perfect: In most of the cases, a forensic expert with a lot of time can trace back your document. If you want absolute privacy, use plain-text.


Julien (jvoisin) Voisin <[email protected]>


MAT does not handle watermaking/tattoos for now. The --low-pdf-quality option may produce heavier PDF for very small files. You should only use it for big files.