How do I make a scanned PDF searchable using OCR?

First, open your scanned PDF in Adobe Acrobat. Go to 'All tools' and select 'Scan & OCR'. Choose 'In this file', then set your page range and the language of the text. Click 'Recognize Text'. Acrobat will add a hidden layer of text, making your scan searchable.

How does OCR PDF in Adobe Acrobat compare to manual data entry from a scan?

Feature OCR PDF in Acrobat Manual Data Entry. Speed Very fast, processes pages in seconds. Very slow, depends on human typing speed. Accuracy High, especially with clear scans (300 DPI). High, but prone to human error. Cost Included with Acrobat, saves labor costs. Requires significant labor cost. Output Searchable text layer in PDF. Typed text in a separate document. Effort Minimal user interaction. High, requires constant attention.

OCR Signed Scan Fast in Adobe Acrobat — How-to & AI prompts

AI prompts

1 way to ask · copy any one

CDecide — “help me choose”A customer dispute demands I find the exact SLA clause in a signed scan we received last month.…+

A customer dispute demands I find the exact SLA clause in a signed scan we received last month. The scan is low contrast and OCR has errors. I have two hours before the escalation meeting. Tell me the quickest sequence to convert this into reliably searchable text, what manual checks to do on any OCR output that matters for the dispute, and how to label the result so the legal team trusts it.

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 your scanned PDF document in Adobe Acrobat.
2
Go to the Tools menu and select Recognize Text.
3
In the Recognize Text dialog, choose Recognize Text in This File.
4
Set the language and other OCR settings as needed.
CautionFor best OCR accuracy, source scans should be at least 300 dpi.
5
Click Recognize Text to start the OCR process.
6
To export as plain text, go to File > Export To > Text.
7
To export as an editable Word document, go to File > Export To > Microsoft Word.
8
Choose your save location and complete the export.
Best practiceReview the exported text or Word file for formatting or recognition errors, especially with complex layouts or handwriting.

In the appWith the API

After OCR, you can search, select, and copy text directly from your scanned PDF before exporting.

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

ArchivistResearcherAdministrative Assistant

FAQ

about this task

First, open your scanned PDF in Adobe Acrobat.
Go to 'All tools' and select 'Scan & OCR'.
Choose 'In this file', then set your page range and the language of the text.
Click 'Recognize Text'. Acrobat will add a hidden layer of text, making your scan searchable.

The 'page contains renderable text' error means that Acrobat found actual text on the page, not just an image. OCR is designed to work only on image-based pages. If your document already has selectable text, OCR will not run because there's nothing for it to convert. Ensure your document is truly an image-only scan for OCR to work.

For the most accurate OCR results, you should scan your documents at 300 DPI (dots per inch). A higher DPI means more detail in the image, which helps the OCR software recognize characters better. While 72 DPI is the lowest acceptable setting, it often leads to less accurate text recognition.

If your scanned document is blurry, OCR will likely have difficulty recognizing the text accurately. Blurry images make it hard for the software to distinguish between characters, leading to many errors or even failed recognition. It's best to rescan the document clearly, ideally at 300 DPI, before attempting OCR to get the best results.

Feature	OCR PDF in Acrobat	Manual Data Entry
Speed	Very fast, processes pages in seconds.	Very slow, depends on human typing speed.
Accuracy	High, especially with clear scans (300 DPI).	High, but prone to human error.
Cost	Included with Acrobat, saves labor costs.	Requires significant labor cost.
Output	Searchable text layer in PDF.	Typed text in a separate document.
Effort	Minimal user interaction.	High, requires constant attention.

OCR Signed Scan Fast

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help

When it fails