How to Fix Acrobat Removing a Digital Signature from a Signed PDF
Question details
The user needs to understand why a digital signature is missing in Acrobat DC even though it appears in other viewers, and how to recover or correct it.
- Product
- Adobe Acrobat / PDF
- Device & OS
- not provided
- Scenario
- Viewing a PDF file that has been digitally signed by multiple parties.
- Observed behavior
- The digital signature disappears when the file is opened in Acrobat DC, and the application prompts the user to save changes, indicating the file was corrupted by a non-compliant viewer.
Verify if the missing digital signature is visible in another application like your web browser or email client to confirm it was originally applied before the file was damaged.
Request Re-signing with a Compliant PDF Viewer
Because the PDF was likely modified or damaged by a non-compliant application (like Apple Preview or a browser plugin), the best resolution is to redo the signing process using standard software.
When a signed PDF is opened and signed again in non-compliant viewers, the original signature fields can become corrupted or invalidated. Acrobat detects this corruption and removes the invalid signature, prompting a save dialog for the damaged file.
Find the original, uncorrupted version of the PDF file from before the second signature was applied.
Email or transfer the original file back to the second signer who caused the signature corruption.
Instruct the signer to download the file locally and open it exclusively in Adobe Acrobat, Acrobat Reader, or WPS Office, rather than signing it directly in an email client or web browser.
Ask them to apply their digital signature using the dedicated software tools and return the newly saved file.
Use WPS Office to Securely Sign and Manage PDFs
WPS Office provides a comprehensive and highly compatible PDF editor. By using WPS Office to read and digitally sign your PDF documents, you avoid signature corruption and ensure your files remain valid across standard PDF readers.
- 1. Install WPS Office: Download and install WPS Office, then open your PDF document within the application.
- 2. Access PDF tools: Navigate to the 'Protect' or 'Fill & Sign' tab located on the top ribbon.
- 3. Apply your signature: Select 'Sign' to create or insert your digital signature securely into the designated field.
- 4. Save the document: Save the PDF file; your signature will remain cryptographically valid and fully compatible with other standard PDF readers like Acrobat.
Frequently Asked Questions
Why does my digital signature show up in Outlook but not in Acrobat?
Outlook and some web browsers use basic previewers that might display the visual representation of a signature without validating its cryptographic integrity. Acrobat performs strict validation and will hide or remove a signature if the file's underlying code was damaged by a non-compliant editor.
Can Apple Preview corrupt PDF digital signatures?
Yes, Apple Preview and many browser-based PDF plugins handle PDF forms and signature fields differently than standard PDF specifications dictate. Saving a previously signed PDF in these applications often invalidates or corrupts existing signatures.
How can I prevent PDF signatures from disappearing in the future?
Always ensure that all parties signing the document use a dedicated, compliant PDF application like Adobe Acrobat, Acrobat Reader, or WPS Office. Advise them to download the file locally to their device before signing, rather than editing it directly in their email previewer or browser.
