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Place all PDFs you want to include in the search index into a single folder on your computer.
Open Adobe Acrobat Pro.
Go to the Tools view and select Catalog.
In the Catalog panel, click New Index.
In the Index Definition dialog, click Add Folder and select the folder containing your PDFs.
Optionally, adjust the advanced options for the index (such as custom stop words or include/exclude subfolders) as needed.
Click Build to start creating the index.
Choose a location and filename for your .pdx index file and click Save.
Wait for the indexing process to complete, then click Close when finished.
Best practiceFor best performance, keep your PDF collection and the .pdx index file together in the same folder so users can easily search across all documents.
After building the index, use the Advanced Search feature and select 'Use Index' to search across all indexed PDFs at once.
This runs in the Acrobat app - there is no separate API for this task.
A PDF index is like a book's index for your collection of PDF files. It lists every word and where it appears. This means Acrobat does not have to read each file completely every time you search. Instead, it quickly checks the index, which is much faster, especially for many documents.
Using 'Catalog' to index your PDFs saves a lot of time and makes searching much more complete. When you index, Acrobat creates a fast search database once. This database covers not only the main text but also comments, bookmarks, tags, metadata, and attachments. Searching each file separately would be very slow and might miss content outside the main body text.