PDF Editing Issues

How to Combine PDF/A Files, Add Page Numbers, and Create an Index

Nimra Malik Oct 23, 2026 868 views

Question details

The user needs a method to combine multiple PDF/A documents, insert page numbers, and generate an index for the finalized file.

How to Combine PDF/A Files, Add Page Numbers, and Create an Index

Product: PDF Editor
Device & OS: not provided
Scenario: Merging and formatting archived documents for final presentation or continued long-term preservation.
Observed behavior: PDF/A files are restricted from extensive editing, preventing users from directly merging files, inserting pagination, or building indexes within the document.

Before you start

Since PDF/A files are locked for long-term archiving, you will need to convert them into standard PDFs before performing any edits. Make sure you have copies of the original files in case you need to preserve their exact initial state.

Solution 1Recommended

Convert to Standard PDF, Edit, and Re-save as PDF/A

The most reliable method is to remove PDF/A restrictions by converting to a standard PDF, making your edits, and then exporting it back to PDF/A format.

Because PDF/A is specifically designed to prevent modifications that could alter the document's appearance over time, direct editing is disabled in most PDF readers and editors.

Convert to Standard PDF

Open your PDF/A file in your PDF editor. Click 'Enable Editing' or save the document as a standard PDF to remove the archiving restrictions.

Combine the Files

Use the 'Merge' or 'Combine' feature in the editor's tools menu to join all your standard PDF files into a single, comprehensive document.

Add Page Numbers

Navigate to the 'Insert' or 'Edit' tab, select 'Page Numbers' or 'Header and Footer', and apply the numbering format to the newly merged document.

Re-convert to PDF/A

Once formatting is complete, go to 'File', choose 'Save As' or 'Export', and select the 'PDF/A' format to lock the document again for compliance and archiving.

Convert to Standard PDF, Edit, and Re-save as PDF/A

Index Creation Tip: It is highly recommended to create the index in the original authoring application (like Word or Writer) before converting the files to PDF. Most PDF editors lack the capability to auto-generate a complex index directly.

Powerful PDF Editing

Easily Manage and Edit PDFs with WPS Office

WPS Office provides a comprehensive PDF toolkit that lets you seamlessly convert, combine, and add page numbers to your documents. Enjoy an intuitive interface that makes handling even restricted formats simple and efficient.

1. Open PDF in WPS: Launch WPS Office and open your PDF/A files using the built-in PDF Editor.
2. Convert and Merge: Save the files as standard PDFs to allow editing, then go to the 'Page' tab and click 'Merge PDF' to combine them into one document.
3. Insert Page Numbers: Navigate to the 'Insert' tab, click on 'Page Number', and select your preferred style and position for the whole document.
4. Export Document: Save your edited document to preserve the new page numbers and the combined file structure securely.

Easily convert PDF/A to standard PDF for unrestricted editingCombine multiple PDF documents in just a few clicksQuickly insert customizable page numbers, headers, and footersHighly compatible with Adobe Acrobat and standard PDF formatting

microsoft office alternative - wps office

Frequently Asked Questions

Why can't I edit a PDF/A file directly?

PDF/A is a standardized format designed specifically for long-term archiving. It restricts certain features, such as changing fonts, adding external content, or modifying pages, to ensure the document looks exactly the same in the future. You must convert it to a standard PDF to enable editing tools.

How do I fix tagging or accessibility issues after combining PDFs?

When you merge standard PDFs, the document tags might break or misalign. You should use the accessibility checker in an advanced PDF editor to auto-tag the document or manually correct the reading order and alt text before saving it back to PDF/A.

Can I automatically generate an index directly inside a PDF?

Most PDF editors do not support automatic index generation from scratch. It is best practice to create your index and table of contents in your original word processing software (like Word or WPS Writer) before exporting the final file to PDF format.

PDF Troubleshooting