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Digital Signature Validity Unknown OR Signature Not Verified on PDF Solutions

Updated: Feb 10

Digital Signature Validity Unknown OR Signature Not Verified on PDF Solutions


Facing Validity Unknown or Digital Signature not verified or Digital Signature Validity Unknown error while signing a PDF file with Digital Signature ? This error is very common while signing a pdf file.

Digital Signature Validity Unknown

Today we will explain the solution for this error.



Step 1: Right click on Signature and Click on Validate Signature

Digital Signature Validity Unknown Solution

Step 2: One popup will be opened, Click on Signature Properties

Digital Signature Validity Unknown Solution

Step 3 : On next screen, Click on Show Signer's Certificate button.

Digital Signature Validity Unknown Solution

Step 4: On next screen, Click on Trust Tab and then click on Add to Trusted Certificates

Digital Signature Validity Unknown Solution

Step 5: One pop up will be opened, Click on OK.

Digital Signature Validity Unknown Solution

Step 6: On next screen tick / click all Tick Box as shown in below screenshot and click on OK.

Digital Signature Validity Unknown Solution

Step 7: On next screen click on OK

Digital Signature Validity Unknown on PDF


Step 8: Now click on Validate Signature

Digital Signature Validity Unknown on PDF

Step 9: On next screen, it will show you Signature is VALID. Click on Close button.

Digital Signature Validity Unknown on PDF


Step 10: In pdf also, you will see Signature Valid.

Digital Signature Validity Unknown on PDF




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