Fix Acrobat COS Document Table Full Error When Extracting PDF Pages
Question details
The user encounters a 'COS document table full' error preventing them from extracting pages from a digitally signed PDF document.
- Product
- Adobe Acrobat DC 2015
- Device & OS
- not provided
- Scenario
- Attempting to extract or split pages from a PDF document that contains numerous digital signatures.
- Observed behavior
- The application displays a 'COS document table full' error message and fails to complete the page extraction process.
Open the signature panel in your PDF viewer to confirm the presence of digital signatures. Understand that successfully extracting pages from a signed document will intentionally remove or invalidate its signature verification.
Use an Unsigned Source Copy
The most reliable method is to perform page extractions on the original document before any digital signatures were applied.
Digitally signed PDFs are explicitly designed to prevent splitting, merging, or altering. Modifying a signed document defeats the purpose of its security and often triggers structural errors like the COS document table full error.
Whenever possible, you should locate the original version of the file and make your page modifications there.
Find the original, unsigned version of the PDF on your local drive or request it from the document creator.
Open the unsigned PDF and proceed to extract or split the required pages.
Once the pages are extracted into a new document, apply new digital signatures to the separated files if required.
Flatten the PDF by Printing to PDF
If the unsigned source is unavailable, you can flatten the PDF to remove interactive signature elements, allowing page extraction.
Adjust Signature Verification Preferences
Modifying how the application verifies Windows integration signatures can sometimes bypass structural conflicts.
Extract PDF Pages Effortlessly with WPS Office
If you frequently need to manage, split, or extract pages from complex PDFs, WPS Office provides a streamlined PDF editing toolkit. It handles page extraction smoothly and offers powerful alternatives to complex signature environments.
- 1. Open your PDF: Launch WPS Office and open your target PDF document.
- 2. Navigate to Page tools: Click on the 'Page' tab located on the top navigation ribbon.
- 3. Select Extract Pages: Click the 'Extract Pages' button to open the extraction settings menu.
- 4. Customize and save: Specify your desired page range and destination folder, then click 'Extract' to generate the new file.
Frequently Asked Questions
Why do I get a 'COS document table full' error in Acrobat?
This error typically occurs when trying to split or extract pages from a PDF that contains numerous digital signatures (often signed on every single page). Modifying signed files conflicts with the document's underlying security structure, overloading the application's document tables.
Can I extract pages from a signed PDF without invalidating the signatures?
No. Digitally signed PDFs are specifically designed to protect document integrity. Any structural change, such as extracting or splitting pages, modifies the document and intentionally invalidates the signatures to indicate that the file has been altered.
What does 'refrying' a PDF mean?
Refrying a PDF means printing it to a new PDF file (using a virtual printer like Microsoft Print to PDF) or saving it as a PostScript file and converting it back. This flattens all interactive elements, removing digital signature validations so the document can be edited or split.
