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Open the PDF file that has an associated search index in Acrobat Reader.
Best practiceIndexed PDFs usually have a companion .pdx or .idx file in the same folder; make sure both are present for best performance.
Press Ctrl+Shift+F (Windows) or Command+Shift+F (Mac) to open the advanced search window.
In the search window, select All PDF Documents in and choose the folder containing the indexed PDFs.
NoteSelecting the folder ensures Acrobat uses the index for faster searching across multiple PDFs.
Enter your search term in the search box.
Click Search to begin searching the indexed PDFs.
CautionIf the index file is missing or not recognized, Acrobat will perform a slower full-text search instead.
Review the search results and click any result to jump to that location in the PDF.
When searching indexed PDFs, results appear much faster than with standard searches, especially across large document sets.
This runs in the Acrobat app - there is no separate API for this task.
A PDF index is like a book's index for many PDF files. It lists all the words and where they are found. This makes searching very fast because Acrobat looks at the small index file instead of opening and reading every single large PDF document each time you search.
Yes, you can. Acrobat's search can look through layers and form fields, which often include text from scanned documents that have been processed with Optical Character Recognition (OCR). This means even if your documents are scans, if they have text layers, the Search Index will still find words within them. Always check if your scanned PDFs have searchable text first.
You should use 'Catalog' because it saves a lot of time and gives a more complete search. Searching each file one by one is slow, especially for many documents. An index searches across all files at once, much faster. Also, the index covers more than just the main text; it also searches comments, bookmarks, tags, metadata, and file attachments.