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

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

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If you are looking for a straightforward, lightweight solution for handling documents, WPS Office provides an excellent alternative. It offers powerful PDF viewing and editing tools without complicated background renaming processes, all within a highly familiar interface.
- 1. Download WPS Office: Visit the official WPS website and download the free installation package.
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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.




