How to recognise a forged document, which technical signals to look at, and what an automated check can and cannot prove. Each guide answers one question.
Edited amounts, altered dates, swapped bank details: the technical evidence that gives away a tampered invoice PDF, and how to check for it.
Read the guide →
Utility, telecom and internet bills used as proof of address: the technical checks that reveal an edited document, and when the checks simply cannot apply.
Read the guide →
A PDF keeps a record of its successive saves: incremental revisions, ghost objects, two sets of metadata. Where to look to find out whether a file was edited.
Read the guide →
The 2D-Doc barcode on tax notices, pay slips and official certificates: what it contains, what it actually proves, and why it is different from every other check.
Read the guide →
These guides describe the method. To apply it to a document, TrustyFile runs these checks automatically and for free.
Analyse a document for free