Other PDF Issues

Why Adobe Acrobat Adds Numbers to PDF File Names After 508 Check

Kushani NimanthikaKushani Nimanthika Nov 3, 2026 868 views

Question details

The user wants to understand why Adobe Acrobat automatically appends a bracketed number to the end of a PDF file name when running a Section 508 accessibility check.

Why Does Acrobat Add Numbers to PDF File Names After a 508 Check?
Product
Adobe Acrobat
Device & OS
not provided
Scenario
Running a Section 508 accessibility check on a PDF document.
Observed behavior
The resulting output file is automatically renamed, with a random number enclosed in brackets appended to the filename (e.g., filename[3459].pdf).
Before you start

Verify the exact destination folder where your accessibility check outputs are being saved, and check if an older version of the document already exists there.

Solution 1Recommended

Prevent File Overwriting and Rename the PDF

Understand Acrobat's automated renaming mechanism and adjust your workflow to prevent bracketed numbers from appearing in your file names.

When Adobe Acrobat runs a Section 508 accessibility check, it generates a report and saves the results. To protect your original data, Acrobat automatically appends a bracketed number to the file name if a document with the exact same name already exists in the destination folder.

This bracketed number is completely random. It is strictly a safety mechanism to prevent overwriting existing files and does not indicate any accessibility errors or compliance failures.

1
Locate the Output Folder

Open the directory where Adobe Acrobat is currently saving your accessibility check results.

2
Check for Existing Files

Look for an older version of your PDF or previous accessibility reports with the exact same file name and delete them if they are no longer needed.

3
Adjust Output Settings

Before running the Section 508 check, navigate to the accessibility checker options and specify a new, empty folder for the output files to prevent naming conflicts.

4
Manually Rename the File

If a file has already been renamed, right-click the PDF with the bracketed number, select 'Rename', and remove the brackets and numbers to restore your original file name.

Prevent File Overwriting and Rename the PDF
Good to Know: The bracketed number is exclusively a file management safeguard and has no impact on the actual accessibility status or Section 508 compliance of your document.
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Frequently Asked Questions

Does the bracketed number indicate a Section 508 compliance error?

No. The number added by Acrobat is merely a safeguard to prevent overwriting an existing file in the same folder. It has no relation to the accessibility score or errors in your PDF.

How can I stop Acrobat from renaming my PDF files during a check?

You can prevent this by ensuring the destination folder does not contain an older file with the same name, or by configuring the accessibility checker to save its report in a completely different directory.

Is it safe to delete the bracketed number from the file name?

Yes, it is completely safe. You can simply rename the file and remove the numbers manually, provided it doesn't conflict with another file in the same location.