How do I make a scanned questionnaire searchable in Acrobat?

Open the scanned questionnaire in Acrobat. Go to 'All tools' and select 'Scan & OCR'. Choose 'In this file' and set the page range and language. Click 'Recognize Text'. Acrobat will add a searchable text layer to your document.

How is OCR different from just scanning a document to PDF?

Feature Scanning to PDF OCR Scanned PDF. Result An image of the document in PDF format. An image of the document with a hidden layer of searchable text. Text Interaction You cannot select, copy, or search for text. You can select, copy, and search for text within the document. Purpose To create a digital copy of a paper document. To make the content of a scanned document accessible and editable.

OCR Scanned Questionnaires in Adobe Acrobat — How-to & AI prompts

AI prompts

2 ways to ask · copy any one

AExecute — “help me do it”Run OCR on the folder of scanned questionnaires, export a searchable PDF and a plain‑text…+

Run OCR on the folder of scanned questionnaires, export a searchable PDF and a plain‑text export per file, and verify that open‑ended answers are searchable so I can run text analysis.

when the reply comes backPush once: ask it to sharpen the weakest part, and to say what it assumed.

BImprove — “do it better”Convert scans to searchable text and export machine‑readable files: OCR each questionnaire,…+

Convert scans to searchable text and export machine‑readable files: OCR each questionnaire, correct obvious recognition errors in respondent IDs, export a searchable PDF plus a single combined CSV of open‑ended responses, and flag pages with low OCR confidence for manual review.

when the reply comes backPush once: ask it to sharpen the weakest part, and to say what it assumed.

How to do it

the tool · the steps · what to avoid

1
Open the scanned PDF file in Adobe Acrobat.
2
Go to the Tools menu.
3
Select Scan & OCR from the tools list.
4
Click Recognize Text and choose In This File.
5
In the settings panel, ensure PDF Output Style is set to Searchable Image.
6
Click Recognize to start the OCR process.
7
Save the PDF after OCR is complete.
Best practiceFor best OCR accuracy, scan your documents at 300 dpi and ensure the images are clear before running OCR.

In the appWith the API

After OCR completes, you can search, copy, and highlight text in your previously scanned PDF.

This runs in the Acrobat app - there is no separate API for this task.

Glossary

words on this page

OCROCR stands for Optical Character Recognition. It is technology that turns images of text into real text you can search and copy.ExampleAfter scanning a paper invoice, OCR allows you to copy the vendor's name from the image.

DPIDPI means dots per inch, and it tells you how clear an image is when it is scanned.ExampleA scanned photo saved at 300 DPI will usually contain more detail than the same photo at 72 DPI.

Searchable LayerA hidden layer of text added to an image-based PDF, allowing you to search for words within the document.ExampleThe hidden searchable layer in the scanned contract allowed us to find specific clauses.

Who does this

3 roles

ArchivistResearch LibrarianRecords Manager

FAQ

about this task

Open the scanned questionnaire in Acrobat.
Go to 'All tools' and select 'Scan & OCR'.
Choose 'In this file' and set the page range and language.
Click 'Recognize Text'. Acrobat will add a searchable text layer to your document.

Acrobat's OCR will fail if the page already has real text, not just an image. This is because the OCR feature is designed to work only on pages that are images. If you see an error message about 'renderable text', it means the page already contains text that Acrobat can read, so OCR is not needed.

For the best OCR accuracy, you should scan your questionnaires at 300 dpi. Scanning at a higher resolution helps the OCR engine to better identify characters and words, leading to fewer errors in the recognized text. The lowest acceptable quality is 72 dpi.

Yes, you can automate OCR for many scanned questionnaires using the Adobe PDF Services API. This API allows you to send your PDF documents programmatically to be OCR'd. It converts the image text into a searchable layer, which is very useful for large-scale archiving or indexing projects without manual intervention.

Feature	Scanning to PDF	OCR Scanned PDF
Result	An image of the document in PDF format.	An image of the document with a hidden layer of searchable text.
Text Interaction	You cannot select, copy, or search for text.	You can select, copy, and search for text within the document.
Purpose	To create a digital copy of a paper document.	To make the content of a scanned document accessible and editable.

OCR Scanned Questionnaires

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help

When it fails