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Text-based PDFs are editable PDFs (unless they have been password protected). Image-based PDFs are PDFs that are made of an image, rather than text, such as when a paper document is scanned, or an image, photo, screenshot, etc. is converted into a PDF.

If you're wondering whether a PDF sent for signature or review has been altered, Adobe Acrobat Pro DC's ?Compare Files? tool can let you know for certain with a list of exactly what changes if any were made and when. Open your original PDF. Go to VIEW in top menu to select COMPARE FILES from drop-down list.

Formatting may change when doing the conversion and the file size and structure will change so it could be very obvious depending on the visual changes or the person determining whether it's been edited may need a copy of the original to compare it. You are best off using a PDF editor that edits the base layer.

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.

To view and track all the PDFs shared for review, do the following: Click Home. In the Shared section, do one of the following: To view the files sent by you for review, click Shared By You. ... To view the details of a PDF, select the PDF. ... To view the comments, double-click the file.

View PDF document properties. Open the PDF in Acrobat. Choose File. Select Properties. Click the Description tab. Find the creation date and time near the title and author.

On Windows, just right-click your PDF and select Properties > Read-only > OK. On a Mac computer, the process is a little more complex. Select the PDF and click File > Get Info. You can then set access rights under the Sharing & Permissions tab.