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[Metadata](/glossary/#metadata) is 'data about data' or 'information about information'. In the context of files, this can mean information that is automatically embedded in the file, and this information can be used to deanonymize you. For example, an image file will often have metadata about when it was taken, where it was taken, what camera it was taken with, and so on. A PDF file may have information about what program created it, what computer, etc. This can be used by investigators to link a photo to the camera on which it was taken, a video to the computer on which it was edited, and so on. To learn more about how metadata can be used to identify and reveal personal information, see [Behind the Data: Investigating metadata](https://exposingtheinvisible.org/en/guides/behind-the-data-metadata-investigations/). Before you put a sensitive file on the Internet, remove the metadata.
[Metadata](/glossary/#metadata) is *data about data* or *information about information*. In the context of files, this can mean information that is automatically embedded in the file, and this information can be used to deanonymize you. For example, an image file will often have metadata about when it was taken, where it was taken, what camera it was taken with, etc. A PDF file may have information about what program created it, what computer, etc. This can be used by investigators to link a photo to the camera on which it was taken, a video to the computer on which it was edited, and so on. Before you put a sensitive file on the Internet, remove the metadata.
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* [Anonymous File Sharing](https://www.whonix.org/wiki/Surfing_Posting_Blogging#Anonymous_File_Sharing) from the Whonix documentation.
* [Redacting Documents/Pictures/Videos/Audio safely](https://anonymousplanet.org/guide.html#redacting-documentspicturesvideosaudio-safely) for a table of recommended software for creating different types of files.
* [Behind the Data: Investigating metadata](https://exposingtheinvisible.org/en/guides/behind-the-data-metadata-investigations/) for how metadata can be used to identify and reveal personal information.