- September 23, 2021
There are two commands you can use to remove hidden information: Sanitize Document and Remove Hidden Information. To remove all hidden information from a PDF file in one go, choose Protect > Hidden Data > Sanitize Document.
To select and remove the hidden information you want to remove, do the following:
1. Choose Protect > Hidden Data > Remove Hidden Information.
2. In the pop-up dialog box, select the document information you want to remove, and click OK.
· Metadata – the data in the document information dictionary and all metadata streams, such as the information in the File > Properties > Description.
· File Attachments – all file attachments in the document, including the ones that are added with the File Attachment command in the Edit tab and the File command in the Comment tab.
· Bookmarks – all bookmarks in the document.
· Embedded search index: the search indexes embedded in the document.
· Comments and markups: all comments added to the document, including files attached as comments.
· Form fields: all form fields in the document. After the removal, all form fields are flattened and can no longer be filled or modified.
· Hidden text: the text that is transparent, covered up by other content, or has the same color as the background in the document.
· Hidden layers: all layers (including both shown and hidden layers) in the document.
· Deleted or cropped content: the invisible content that has been removed or cropped, such as deleted or cropped pages.
· Overlapping Objects: If a page includes objects (not including text objects) that overlap one another, the whole page will be changed to an image object after the removal.
Note: When you remove hidden information with the Sanitize Document command, the multimedia files added using the Audio & Video command will also be removed.