PDF OCR
Upload a scanned PDF and run optical character recognition to extract text or create a fully searchable PDF. Supports 14 languages and processes entirely in your browser - no server uploads, no signup required.
Upload a PDF to start OCR.
Tips for better OCR accuracy
- • Use higher render quality (288 DPI) for small or dense text
- • Select the correct document language for the best results
- • OCR works best on scanned documents with clear, high-contrast text
- • Already-searchable PDFs with embedded text do not need OCR
- • Processing time scales with page count and render quality
Why Use Our PDF OCR Tool?
Instant Scanned PDF to Text
Convert scanned PDFs into searchable, copyable text in seconds. Our pdf ocr tool renders each page and runs Tesseract.js recognition entirely in your browser.
Searchable PDF Output
Generate a searchable PDF with invisible text overlaid on your original pages - every PDF viewer can search, copy, and highlight the recognized content.
14 Language Support
Run pdf ocr online free in English, French, German, Spanish, Chinese, Japanese, Arabic, Hindi, and 6 more languages for accurate multilingual recognition.
100% Private Browser Processing
Your PDF never leaves your device during ocr pdf processing. All page rendering and text recognition runs locally - no uploads, no accounts, completely private.
Common Use Cases for PDF OCR
Digitize Paper Documents
Scan paper contracts, forms, and letters and run pdf ocr to convert them into searchable digital records you can copy and archive.
Legal & Compliance Records
Make scanned legal briefs, court filings, and compliance documents text-searchable for faster case review and keyword-based discovery.
Scanned Books & Articles
Use ocr pdf online free to extract text from scanned academic papers, textbook pages, and published articles for research and citation.
Document Archive Indexing
Convert entire batches of scanned archive PDFs into searchable files so your document management system can index and retrieve them.
Searchable Invoice Processing
Run pdf ocr on scanned invoices and receipts to extract vendor names, amounts, and dates for accounting and expense workflows.
Accessibility Improvements
Overlay recognized text on image-based PDFs so screen readers and assistive technologies can access the content for users with visual impairments.
Understanding PDF OCR
What is PDF OCR?
PDF OCR (Optical Character Recognition) is the process of analyzing the pixel data of scanned PDF pages and identifying the shapes of characters to reconstruct machine-readable text. When a physical document is scanned, the result is an image - there is no underlying text layer, so you cannot select, search, or copy the content. Running pdf ocr online free adds that missing text layer, making the document fully searchable and accessible in any PDF viewer or document management system.
How Our PDF OCR Tool Works
- Upload your scanned PDF - select a file using the drop zone. The PDF loads entirely in your browser, no server upload occurs.
- Configure language and quality - select the document language for accurate character recognition and choose a render quality (DPI) that balances speed with accuracy for your document type.
- Run OCR and download - each page is rendered to a canvas and analyzed by Tesseract.js. Download the recognized text as a .txt file or as a fully searchable PDF with invisible text overlaid on the original pages.
What Gets Recognized
- Printed text - standard typeface characters from scanned books, reports, letters, and forms recognized with high accuracy
- Multi-column layouts - paragraphs, headers, and columns extracted in reading order for clean plain-text output
- Multilingual content - 14 supported languages including CJK scripts, Arabic (RTL), Cyrillic, and Latin character sets
- Handwriting limitation - handwritten text is not reliably recognized; OCR accuracy is optimized for printed or typed documents
Privacy, Security & Availability
The pdf ocr tool runs 100% client-side in your browser using Tesseract.js. Your scanned PDF is rendered and processed entirely on your device - the file is never uploaded to any server. The tool is completely free with no account, no usage limits, and no watermarks added to your output. Practical processing speed depends on your device performance, the number of pages, and the render quality setting you choose.
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Frequently Asked Questions About PDF OCR
PDF OCR (Optical Character Recognition) converts scanned image-based PDFs into text-searchable documents. You need it when your PDF was created by scanning a physical document and you cannot select, copy, or search the text inside it.
You can choose Plain Text (.txt) to get all recognized text in a copyable file, or Searchable PDF to overlay invisible recognized text onto your original PDF - making it fully searchable and copyable in any PDF viewer.
The tool supports 14 languages including English, French, German, Spanish, Portuguese, Italian, Dutch, Polish, Russian, Chinese (Simplified), Japanese, Korean, Arabic, and Hindi. Select the correct language before running OCR for the best accuracy.
Accuracy depends on the quality of the scanned pages. Clean, high-contrast scans at 300 DPI or above typically achieve 90%+ accuracy. Use the Highest (288 DPI) render quality setting for small or dense text. The tool shows a confidence percentage after each run.
No. The entire OCR process runs 100% locally in your browser using Tesseract.js. Your PDF pages are rendered and recognized on your device - nothing is uploaded to any server.
Processing time depends on the number of pages and render quality selected. A typical 5-page scanned document at Balanced quality takes around 30-60 seconds. Higher render quality takes longer but produces better results for dense text.
Yes, but OCR is unnecessary for PDFs that already contain embedded searchable text. Use the PDF to Text tool instead for those documents. OCR is specifically designed for scanned image-based PDFs where text is part of the image pixels.
Yes. The pdf ocr tool is completely free to use with no account, no file upload limits, and no watermarks added to your output. All processing runs in your browser at no cost.