How to Fix PDF to PDF/A-1a Conversion Errors in Adobe Acrobat
Question details
The user needs to resolve conversion failures occurring when trying to save a standard PDF as a PDF/A-1a archival file.
- Product
- Adobe Acrobat XI
- Device & OS
- not provided
- Scenario
- Converting an existing PDF document to the PDF/A-1a standard for long-term archiving compliance.
- Observed behavior
- The conversion process fails, displaying Missing MarkInfo and missing structure-tree node errors, usually because the source PDF lacks the required tagging or ISO compliance.
Ensure you have both Adobe Acrobat and Acrobat Distiller installed on your computer, and verify that your original PDF document is not password-protected or restricted from editing.
Convert the PDF to PostScript and Re-distill to PDF
This method strips out problematic metadata, corrupted tags, and non-compliant structures by flattening the file into a PostScript format before rebuilding it as a clean PDF.
Often, PDFs created by third-party applications do not follow strict ISO standards, missing the necessary structural tags required for PDF/A-1a. Flattening the file via PostScript can bypass these structural errors.
Launch Adobe Acrobat and open the PDF file that is failing to convert.
Navigate to the top menu, click on 'File', select 'Save As Other', then click on 'More Options' and choose 'PostScript'.
Open the Acrobat Distiller application on your computer, then load the newly created PostScript (.ps) file to convert it back into a standard PDF document.
Open the newly distilled PDF in Adobe Acrobat and attempt to convert it to the PDF/A-1a format again using the 'Save As Other' menu.
Use WPS Office for Seamless PDF Editing and Exporting
Avoid complex PostScript workarounds. WPS Office provides a built-in, user-friendly PDF editor that allows you to create, edit, and export PDF documents seamlessly, ensuring clean files that comply with standard document structures.
- 1. Open WPS Office: Launch WPS Office and click on the 'PDF' tab on the main home screen to access the PDF tools.
- 2. Load Your Document: Click 'Open' to load the source document (such as a Word file, image, or existing PDF) that you want to manage or standardize.
- 3. Export to Standard PDF: Go to the 'Menu' at the top left and select 'Export to PDF', or use the 'Save As' feature to ensure your document is saved cleanly without corrupted third-party tags.
Frequently Asked Questions
What is a PDF/A-1a file and why is it used?
PDF/A-1a is an ISO-standardized version of the Portable Document Format (PDF) designed specifically for the long-term archiving of electronic documents. The '1a' conformance level ensures that the document is both visually reproducible and structurally tagged for accessibility.
Why do I get a 'Missing MarkInfo' error during PDF/A conversion?
This error occurs when the source PDF lacks the necessary structural tags and metadata required by the PDF/A-1a standard. It typically happens if the PDF was generated by a third-party application or basic print-to-PDF driver that does not fully comply with ISO PDF specifications.
Can I fix missing structure-tree node errors without Acrobat Distiller?
If you do not have Acrobat Distiller, you can bypass the error by recreating the PDF directly from the original source file (like a Word or Excel document) using a fully compliant PDF creator, or by utilizing the native 'Export to PDF' features found in modern suites like WPS Office or Microsoft Office.
