Fix HFT Errors When Adding Multiple Digital Signatures in PDF
Question details
The user needs to visually sign every page of a multipage PDF document without encountering file errors during the process.
- Product
- Adobe Acrobat XI
- Device & OS
- Windows
- Scenario
- Attempting to sign every individual page of a multipage PDF file using digital signatures.
- Observed behavior
- An HFT error is triggered after saving the first digital signature and attempting to add a second one, preventing the user from signing subsequent pages.
Before modifying your document, prepare a scanned image of your handwritten signature or a custom electronic stamp to use as a visual mark for individual pages.
Use Electronic Signatures for Pages and One Digital Certificate for the File
Prevent HFT errors and file bloat by applying visual electronic marks to individual pages, followed by a single digital signature to secure the entire document.
Digital signatures act as a cryptographic seal over the entire document, rather than just the page where the visual mark appears. Repeatedly applying a digital certificate as the same user on every page drastically increases file size and exceeds software format limits, which triggers the HFT error.
To properly authenticate a document while showing a visual mark on every page, you should differentiate between electronic signatures (visual marks) and digital signatures (cryptographic certificates).
Open your PDF document and navigate to the first page. Use the electronic signature or stamp tool to place an image of your handwritten signature.
Copy and paste or re-apply this visual electronic signature mark to every page that requires visual authentication.
Once all visual marks are placed, navigate to the final signature field of the document and apply your certificate-based digital signature to seal the entire file.
Save the PDF file. The single digital certificate will now protect the whole document from tampering without triggering software limits or HFT errors.
Secure and Sign PDFs Easily with WPS Office
WPS Office provides a highly capable PDF editor that lets you easily apply electronic signatures to multiple pages and add digital certificates without encountering complex software limits or HFT errors.
- 1. Open the PDF in WPS Office: Launch WPS Office and open the multipage PDF document you need to sign.
- 2. Use the Fill & Sign feature: Navigate to the 'Protect' or 'Fill & Sign' tab on the top ribbon.
- 3. Create and place visual signatures: Click 'Sign' to create your electronic signature and stamp it onto every required page.
- 4. Secure with a digital certificate: Apply a single digital signature certificate at the end of the document to cryptographically lock the file, then save.
Frequently Asked Questions
What is the difference between an electronic signature and a digital signature?
An electronic signature is a visual representation of your handwritten signature, such as a scanned image or typed name. A digital signature is a cryptographic seal applied to the entire document to verify identity and detect unauthorized changes.
Why does applying a digital signature to every page cause an HFT error?
Digital signatures secure the entire file, not just individual pages. Repeatedly signing the same document with the same certificate exponentially increases the file size and hits formatting or software limits, resulting in errors like the HFT error in Acrobat XI.
Does a visible signature mark on one page mean only that page is signed?
No. A visible digital signature mark is just a visual indicator on a specific page. The underlying digital certificate actually secures the entire PDF document, regardless of where the visual mark is placed.
When is it appropriate to use multiple digital signatures in a single PDF?
Multiple digital signatures should be used when different individuals or organizations need to sequentially authenticate and sign the same document. Signing multiple times as the same person is generally unnecessary and causes workflow issues.
