Notes 
#1 
MAT2 (Metadata Anonymisation Toolkit 2) removes embedded metadata from images, PDFs, audio files, office documents, and more. It runs as a CLI tool or as a file-manager extension for Nautilus and Dolphin on Linux.
Open Source Metadata Removal
The Metadata Removal we recommend, filtered to Open Source. See all Metadata Removal →
#2 
ExifTool is a long-standing Perl library and command-line tool for reading, writing, and erasing metadata across an exceptionally wide range of file formats, including JPEG, RAW camera formats, PDF, video, audio, and Office documents.
#3 
Removes metadata for the most popular image and video formats. It also supports PDF files and comes with batch-processing to process multiple files at once. Drag and Drop…
