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OCR PDF - PDF OCR - Scan PDF - Free OCR - PDF to OCR Converter

Convert scanned PDFs into searchable PDFs with invisible text layers using advanced OCR technology. Supports 100+ languages, preserves original layout, and keeps text hidden but searchable.

Searchable Output Invisible Text Layer Free & Secure

Key Features

Searchable PDF Output

Transform scanned image-based PDFs into fully searchable documents. The OCR text layer is embedded invisibly so you can search, copy, and index your documents.

100+ Language OCR

OCR engine supports Arabic, Chinese, English, French, German, Hindi, Japanese, Korean, Russian, Spanish, Urdu, and many more. Accurate text recognition for global documents.

Preserve Original Layout

The original PDF appearance is completely preserved. Images, formatting, and layout remain identical while the searchable text layer is added transparently.

Smart Font Embedding

Automatically selects the right font for your language. Uses Noto fonts for Arabic, Chinese, Japanese, Korean, Hindi, and more. Latin scripts use Helvetica.

Google Drive Integration

Connect your Google Drive to upload searchable PDFs directly. Files are organized in onlineocr.io/Pdf2Ocr folder. Auto-sync after processing.

Bulk ZIP Download

Process multiple PDFs and download all searchable versions as a single ZIP file. Batch processing with configurable concurrency for faster results.

How to Make a PDF Searchable

1
Upload PDF

Upload your scanned PDF files by dragging & dropping or browsing. Supports up to 5 files with 25MB max each.

2
Select Language

Choose your document's language from 100+ options. The OCR engine uses this to optimize text recognition accuracy.

3
Create Searchable PDF

Click "Extract All" to run OCR on all pages. An invisible text layer is added on top of each page image with precise word positioning.

4
Download & Use

Download individual searchable PDFs or all as ZIP. Upload to Google Drive, share, or use in any PDF reader with search capability.

Why Choose Our PDF OCR Tool?

  • No Registration Required - Start making PDFs searchable immediately
  • Invisible Text Layer - Text is searchable but doesn't affect visual appearance
  • Multi-Language Fonts - Correct fonts for Arabic, CJK, Indic, and Latin scripts
  • Batch Processing - Convert up to 5 PDFs simultaneously
  • 100% Browser-Based - All OCR happens locally, no server uploads
  • Preserves Original Quality - PDF images remain at original resolution
  • ZIP Download - Download all searchable PDFs in one compressed file
  • Google Drive Ready - Direct upload to Drive with auto-sync option

Frequently Asked Questions

A searchable PDF has an invisible text layer overlaid on the scanned image. This allows you to search for words, copy text, and index the document while the visual appearance remains identical to the original scan. It's ideal for archiving, document management systems, and making scanned documents accessible.

No! The OCR text layer is completely invisible (0% opacity). It doesn't affect the visual appearance of your PDF in any way. The original scanned image remains exactly as it was. The text is only there for searching, copying, and indexing purposes.

Yes, absolutely! All OCR processing happens locally in your browser using Tesseract.js and PDF.js. Your files are never uploaded to any server. The searchable PDF is created entirely on your device. Google Drive sync is optional and requires your explicit permission.

We support 100+ languages with automatic font selection. Latin scripts use Helvetica, Arabic/Persian/Urdu use Noto Naskh Arabic, Chinese uses Noto Sans SC/TC, Japanese uses Noto Sans JP, Korean uses Noto Sans KR, and Devanagari/Hindi uses Noto Sans Devanagari. Other scripts fall back to Noto Sans.

Yes! Upload up to 5 PDFs (up to 10 for registered users) and process them all at once. Each PDF gets its own searchable text layer. After processing, you can download individual files or use the "Download All as ZIP" button to get everything in one compressed file.

Connect your Google Drive account to upload searchable PDFs directly. Files are saved in onlineocr.io/Pdf2Ocr folder as _searchable.pdf. Enable auto-sync in settings to automatically upload after processing, or manually upload individual files. Only registered users can access this feature.

Yes! After processing all PDFs, click the "Download All as ZIP" button to get a single ZIP file containing all searchable PDFs. Each file is named with "_searchable" suffix to distinguish from the original. This is perfect for batch processing multiple documents.

Yes! Our PDF to Searchable PDF converter is fully responsive and works on all devices - desktop, tablet, and mobile. The interface adapts to your screen size. However, OCR processing is CPU-intensive, so desktop usage is recommended for large files.

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