How to Verify the Validity of Electronic Signatures in Adobe Acrobat
Question details
The user needs to know how to properly verify if an electronic signature in a certified PDF document is authentic and legally valid.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Receiving a digitally signed PDF document and needing to confirm the document's integrity and the signer's identity without falling for forged visual marks.
- Observed behavior
- Users often mistakenly rely on the visual appearance of a signature on the page, screen, or printed copy, which can be easily faked and does not represent true digital validation.
Ensure you are opening the signed PDF document in a dedicated desktop PDF reader, as most web browsers and basic preview apps do not support digital certificate validation.
Use the Signatures Panel to Verify Validation Status
Bypass visual page marks and use the built-in Signatures panel to securely check certificate details and document integrity.
It is critical not to rely on the signature mark displayed on the page itself for any legal or official purpose. Doing so leaves you vulnerable to accepting forged documents, as visual stamps or images can be easily copied. True validation requires checking the cryptographic certificate embedded in the file.
Launch Adobe Acrobat Pro or Acrobat Reader and open the digitally signed PDF file you wish to verify.
Look at the left-hand navigation pane and click on the 'Signatures' icon (it looks like a fountain pen). This will expand the Signatures panel.
Expand the signature entry in the panel to view its validation status. Check the signer's identity, the time of signing, and whether the document has been modified since the signature was applied.
Right-click the signature in the panel and select 'Show Signature Properties', then click 'Show Signer's Certificate' to verify the certificate authority and ensure it is a trusted source.
Easily Verify Electronic Signatures with WPS Office
WPS Office provides a comprehensive, built-in PDF toolset that allows you to securely view, manage, and verify digital signatures in your documents. Ensure your files are authentic and unmodified using a lightweight, free alternative.
- 1. Open the PDF in WPS Office: Launch WPS Office and open your digitally signed PDF document.
- 2. Navigate to the Protect Tab: Click on the 'Protect' tab in the top ribbon to access document security features.
- 3. Manage Signatures: Click on 'Manage Signatures' or check the left-hand sidebar for the signature pane to review embedded digital certificates.
- 4. Verify Authenticity: Click on the listed signature to view detailed validation properties, confirming that the document has not been altered since it was signed.
Frequently Asked Questions
Why shouldn't I trust the visual signature on the printed PDF page?
Visual signature marks, such as scanned images of handwriting, stamps, or typed names, can be easily copied and pasted by anyone. A valid electronic signature utilizes underlying cryptographic certificates that must be verified electronically to confirm authenticity and document integrity.
Do signatures created in Adobe Acrobat Reader and Acrobat Pro have the same legal status?
Yes. The legal status of a signature does not depend on whether it was created in the free Reader or the Pro version. Instead, it depends on the validity of the digital certificate used, the cryptographic method, and the laws of your specific jurisdiction.
What does 'Validity Unknown' mean in the Signatures panel?
This message typically indicates that the digital certificate used to sign the PDF is not currently in your software's list of Trusted Identities. You can manually inspect the certificate details and, if you trust the source, add it to your trusted certificates list to successfully validate the signature.
Can I verify certified PDF signatures using a web browser?
Most web browsers (like Chrome or Edge) have basic built-in PDF viewers that do not support advanced digital certificate validation. To properly verify an electronic signature, you must download the file and open it in dedicated PDF software like Adobe Acrobat or WPS Office.
