find out changes

Forum|Forum|1 year ago
February 10, 2025
1 reply
875 views

how to find out the changes made to the PDF file before receiving it

PDF

try67

Community Expert

Changes compared to what? You can't find out anything until you've received the file and can compare it to something else, like a previous (or different) version.

D

daniela_schAuthor

Participating Frequently

Thanks. My problem is : i recive from an office a PDF file. I have to find out if this file (which I have never seen and of which I have no other versions) has been manipulated and if YES, how. Could you help me? many thanks

Daniela

MikelKlink

Participating Frequently

Thanks. There is no way to discover if if a part of a PDF document has been changed? A register of changes made for example, to see the author, the date or something similar. In my case i need to evaluate in contable document if any sum or value has been changed

Thanks

DS

There is no way to discover if if a part of a PDF document has been changed? A register of changes made for example, to see the author, the date or something similar.

Well, there is no requirement for a PDF processor to add a hint that they have manipulated a document. There are certain PDF parts where programs can add such hints (Info dictionary, metadata stream, ...). But on one hand you say you don't know what the original document looked like, so maybe such a hint you find may already have been part of the original. And on the other hand someone seriously trying to manipulate the PDF will choose a PDF processor that does not leave such hints unless they are dilettantes.

You'd need either the original or at least a secured fingerprint thereof, e.g. in the form of a digital signature by an identity that for sure is not involved in forgery.

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