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If you go to the document properties of a PDF file (control or command d), if the proper metadata is available, it will list the creation date and time and modified date and time. This can help you determine if a pdf file has been modified since creation. However, it is not foolproof. This metadata is not secured.

View status & history of a PDF file Open a document for viewing. In the top right click the Info button which is the letter i in a circle. A drawer opens from the right-hand side with 4 tabs. The Activity tab shows all actions taken on the document, including when and by whom.

If you go to the document properties of a PDF file (control or command d), if the proper metadata is available, it will list the creation date and time and modified date and time. This can help you determine if a pdf file has been modified since creation.

Adobe Acrobat's 'compare' tool for PDFs Open the original PDF. In the View tab, choose Compare Files. Use the New File option that pops up to choose the PDF you want to compare the original to. Click the blue Compare button to view Acrobat's report comparing the documents side-by-side, highlighting all the changes.

Security Online PDF converters are probably one of the least secure methods for creating a PDF. Using an online converter for a Word document means that your documents must pass through a third party before you get the finished product.

How to edit PDF files online. Choose a PDF to edit by clicking the Select a file button above or drag and drop a file into the drop zone. Once Acrobat uploads the file, sign in to add your comments. Use the toolbar to add text, sticky notes, highlights, drawings and more.

Under 'Document Properties' > 'Description' of the PDF document, there is a button entitled 'Additional Metadata'. This is where the history of the document is contained.