How to Show Original File Names in Acrobat PDF Thumbnails
Question details
The user wants to display the original source file names instead of continuous page numbers in the thumbnail pane of a merged PDF document.

- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Combining multiple PDF files into a single document and needing to identify each section by its original file name for easier navigation.
- Observed behavior
- Acrobat displays continuous page numbers in the thumbnail pane by default, without indicating the original source file names of the merged documents.
Keep a list of your original file names and their corresponding page ranges handy before modifying the merged PDF. Ensure you have full editing permissions for the combined document.
Manually Add File Names as Prefixes Using Page Labels
Since Acrobat does not display source file names automatically in the thumbnail pane, you can manually rename the page labels for each section to include the original file name.
Page Labels allow you to customize how page numbers appear in the thumbnail view and page navigation toolbar. By setting a prefix for a specific page range, you can mimic the appearance of file names.
Click on the Page Thumbnails icon on the left navigation pane in Adobe Acrobat to expand the thumbnails view.
Select the thumbnail of the first page from the source file, hold the Shift key, and click the last page of that file's section to highlight the entire range.
Right-click the selected thumbnails and choose 'Page Labels' from the context menu.
Select 'Begin new section', change the numbering style to 'None', and type the original file name into the 'Prefix' box. Click OK to apply the changes.

Easily Manage Merged PDFs with WPS Office
Instead of manually editing page labels, WPS Office PDF can merge your documents and help you organize them efficiently. Using bookmarks is a much faster way to navigate merged sections than renaming thumbnails.
- 1. Open WPS PDF: Launch WPS Office and switch to the PDF tab.
- 2. Merge PDF files: Click on 'Merge PDF' from the toolkit, add the files you want to combine, and click 'Merge'.
- 3. Open the Bookmarks pane: Open the newly merged PDF and click the Bookmarks icon on the left sidebar.
- 4. Add file names as bookmarks: Navigate to the first page of each merged section, click 'Add Bookmark', and type the original file name to easily organize your document.

Frequently Asked Questions
Is there a built-in feature in Acrobat to show file names in thumbnails automatically?
No, Adobe Acrobat does not currently offer a standard option to display the original source file names directly within the page thumbnails pane. You must use the Page Labels workaround or custom scripts.
Do Page Labels change the actual content of my PDF?
No, Page Labels only change how the page numbers are displayed in the thumbnail pane and the page navigation toolbar. They do not alter the text, images, or layout on the PDF pages.
Can I use bookmarks instead of page labels to identify source files?
Yes. Creating bookmarks for the first page of each merged section using the original file name is often an easier and more accessible way to navigate combined PDFs than changing page labels.




