Across multiple studies, OCR of handwritten [surveys] creates recurring errors—names misread, line breaks lost, and co…
Open your scanned PDF in Adobe Acrobat.
Go to All tools and select Scan & OCR.
From the left panel, select Enhance Scans.
Adjust the image borders if needed by dragging the blue handles to tightly frame the document content.
Use the available enhancement options to deskew, adjust contrast, and remove background as needed for clarity.
Best practiceImproving contrast and removing background noise before OCR can significantly increase text recognition accuracy, especially for faded or uneven scans.
Click Apply to save the image enhancements.
Return to the Scan & OCR pane and select Recognize Text.
Choose In This File to run OCR on the current document.
Click Recognize Text to start the OCR process.
NoteIf the document was previously OCR'd, Acrobat may prompt to re-recognize text; confirm to proceed if needed.
Save the enhanced, OCR-processed PDF.
Enhancing the image before running OCR helps Acrobat recognize text more accurately in poor-quality scans.
This runs in the Acrobat app - there is no separate API for this task.
This message means that the page you are trying to process already has real text on it, not just an image of text. OCR is designed to work only on image-based pages. If you see this error, it means Acrobat cannot add a searchable text layer because one already exists or the page is not an image.
If your scanned document is blurry, the OCR might not work well. The quality of the scan directly affects how accurately Acrobat can recognize text. For the best results, try to scan documents at a higher resolution, like 300 dpi, to ensure the text is clear and sharp. Blurry text can lead to many errors in the recognized text.
Choosing the correct language is very important because text recognition uses language-specific patterns and dictionaries to understand the text. If you select the wrong language, Acrobat might misinterpret words or fail to recognize them at all, leading to many errors in the searchable text layer. Always match the language setting to the document's content.
No, you generally cannot use OCR on a PDF created directly from a word processor. These PDFs already contain 'renderable text,' meaning the text is real and searchable from the start. OCR is specifically for converting images of text into searchable text. If your PDF is from a word processor, it already has the feature OCR provides.