What is metadata, and why remove it?
Short answer
Metadata is information about a file rather than its visible content, such as the author, the device or software used, and timestamps. It travels inside photos, PDFs, and documents, so it can reveal more than you intend when you share them.
Data about data
Every file carries more than what you see. Metadata describes the file itself: when it was created, what made it, and sometimes who. It is useful for organization, but it can quietly expose details you would not write into the content.
Where it hides
- Photos: camera model, settings, timestamps, and GPS location in EXIF
- PDFs: author, software, and creation and modification dates
- Office documents: author, company, comments, and edit history
- Text and exports: sometimes user names or system paths
How to remove it
Each file type has its own way to strip metadata. Redrawing a photo removes EXIF, clearing a PDF's properties removes its document info, and redacting text removes sensitive content. See What is EXIF metadata? and What metadata is hidden in a PDF?.