How to Extract Text from a Scanned PDF — OCR Guide
Why Scanned PDFs Are Different
When you scan a physical document, the scanner takes a photograph of the page and saves it as an image. Even if the result is wrapped in a PDF container, the content is still an image — there are no characters to select or copy. OCR (Optical Character Recognition) is the technology that reads the pixels in the image and converts them back into machine-readable text.
How FreeOCRKit Processes Scanned PDFs
FreeOCRKit's PDF OCR tool works entirely in your browser. When you upload a scanned PDF, each page is rendered as a high-resolution image using PDF.js. Tesseract.js then runs OCR on each page image to extract the text. The extracted text from all pages is combined and can be copied or downloaded as a .txt file. No files are uploaded to any server.
Improving OCR Accuracy
OCR accuracy depends heavily on scan quality. For best results: scan at 300 DPI or higher, use black-and-white scanning for text documents, ensure the document is straight (not rotated), and keep the contrast high. If your scan has shadows, skew, or low resolution, accuracy will be lower. Preprocessing the image in a photo editor to increase contrast before uploading can significantly improve results.
Selecting the Right Language
Tesseract is trained separately for different scripts and languages. Always select the correct language for your document. For documents with mixed languages (e.g., English headings and French body text), process the document twice with each language and merge the results. FreeOCRKit supports 20+ languages including Arabic, Chinese, Hindi, Japanese, and all major European languages.
What to Do with Extracted Text
Once you have extracted text, you can: copy it directly into a word processor, search for specific terms, translate it using a translation tool, feed it into an AI for summarization, or save it as a plain text file for archiving. If the formatting matters, FreeOCRKit's text output preserves paragraph breaks as recognized by Tesseract.
Frequently Asked Questions
Extract text from your scanned PDF
Use FreeOCRKit's PDF OCR tool to convert any scanned document to editable text — free, browser-based, no sign-up.
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