OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched or copy-pasted. Now with an enhanced web interface for easy configuration and batch processing!

ocrmypdf                      # it's a scriptable command line program
   -l eng+fra                 # it supports multiple languages
   --rotate-pages             # it can fix pages that are misrotated
   --deskew                   # it can deskew crooked PDFs!
   --title "My PDF"           # it can change output metadata
   --jobs 4                   # it uses multiple cores by default
   --output-type pdfa         # it produces PDF/A by default
   input_scanned.pdf          # takes PDF input (or images)
   output_searchable.pdf      # produces validated PDF output

See the release notes for details on the latest changes.

• Generates a searchable PDF/A file from a regular PDF
• Places OCR text accurately below the image to ease copy / paste
• Keeps the exact resolution of the original embedded images
• When possible, inserts OCR information as a "lossless" operation without disrupting any other content
• Optimizes PDF images, often producing files smaller than the input file
• If requested, deskews and/or cleans the image before performing OCR
• Validates input and output files
• Distributes work across all available CPU cores
• Uses Tesseract OCR engine to recognize more than 100 languages
• Keeps your private data private.
• Scales properly to handle files with thousands of pages.
• Battle-tested on millions of PDFs.

• Beautiful Web UI: Modern, responsive interface with Chinese language support
• Preset Templates: Quick configuration for common use cases (Document Scanning, Book Scanning, etc.)
• Batch Processing: Process multiple files simultaneously with progress tracking
• Real-time Progress: Visual progress indicators for both single and batch operations
• Configuration Validation: Automatic parameter validation with helpful error messages
• PDF Metadata Editing: Edit title, author, subject, and keywords directly in the interface
• Enhanced Error Handling: Comprehensive logging and user-friendly error messages
• File Size Comparison: See before/after file sizes for optimization insights

For details: please consult the documentation.

I searched the web for a free command line tool to OCR PDF files: I found many, but none of them were really satisfying:

• Either they produced PDF files with misplaced text under the image (making copy/paste impossible)
• Or they did not handle accents and multilingual characters
• Or they changed the resolution of the embedded images
• Or they generated ridiculously large PDF files
• Or they crashed when trying to OCR
• Or they did not produce valid PDF files
• On top of that none of them produced PDF/A files (format dedicated for long time storage)

...so I decided to develop my own tool.

Linux, Windows, macOS and FreeBSD are supported. Docker images are also available, for both x64 and ARM.

For the enhanced web interface, install additional dependencies:

# Install web interface dependencies
pip install streamlit pikepdf

# Launch the web interface
streamlit run ocrmypdf_web.py

The web interface will be available at http://localhost:8501

For everyone else, see our documentation for installation steps.

OCRmyPDF uses Tesseract for OCR, and relies on its language packs. For Linux users, you can often find packages that provide language packs:

# Display a list of all Tesseract language packs
apt-cache search tesseract-ocr

# Debian/Ubuntu users
apt-get install tesseract-ocr-chi-sim  # Example: Install Chinese Simplified language pack

# Arch Linux users
pacman -S tesseract-data-eng tesseract-data-deu # Example: Install the English and German language packs

# brew macOS users
brew install tesseract-lang

You can then pass the -l LANG argument to OCRmyPDF to give a hint as to what languages it should search for. Multiple languages can be requested.

OCRmyPDF supports Tesseract 4.1.1+. It will automatically use whichever version it finds first on the PATH environment variable. On Windows, if PATH does not provide a Tesseract binary, we use the highest version number that is installed according to the Windows Registry.

Once OCRmyPDF is installed, the built-in help which explains the command syntax and options can be accessed via:

ocrmypdf --help

Our documentation is served on Read the Docs.

Please report issues on our GitHub issues page, and follow the issue template for quick response.

# Add an OCR layer and convert to PDF/A
ocrmypdf input.pdf output.pdf

# Convert an image to single page PDF
ocrmypdf input.jpg output.pdf

# Add OCR to a file in place (only modifies file on success)
ocrmypdf myfile.pdf myfile.pdf

# OCR with non-English languages (look up your language's ISO 639-3 code)
ocrmypdf -l fra LeParisien.pdf LeParisien.pdf

# OCR multilingual documents
ocrmypdf -l eng+fra Bilingual-English-French.pdf Bilingual-English-French.pdf

# Deskew (straighten crooked pages)
ocrmypdf --deskew input.pdf output.pdf

1. Launch the web interface:

   streamlit run ocrmypdf_web.py

2. Quick Start with Presets:

   • Select "文档扫描" (Document Scanning) for general documents
   • Select "图书扫描" (Book Scanning) for books with rotation correction
   • Select "混合语言" (Mixed Language) for English+Chinese documents

3. Batch Processing:

   • Enable "批量处理模式" (Batch Processing Mode)
   • Upload multiple PDF or image files
   • Monitor real-time progress for each file
   • Download processed files individually

4. Advanced Configuration:

   • Adjust DPI settings for image quality
   • Configure optimization levels
   • Edit PDF metadata (title, author, keywords)
   • Set custom OCR languages and processing options

Features:

• 🎨 Beautiful Chinese/English interface
• 📋 Preset templates for common scenarios
• 🔄 Batch processing with progress tracking
• ⚙️ Real-time configuration validation
• 📊 File size comparison and optimization insights

For more features, see the documentation.

In addition to the required Python version, OCRmyPDF requires external program installations of Ghostscript and Tesseract OCR. OCRmyPDF is pure Python, and runs on pretty much everything: Linux, macOS, Windows and FreeBSD.

• Going paperless with OCRmyPDF
• Converting a scanned document into a compressed searchable PDF with redactions
• c't 1-2014, page 59: Detailed presentation of OCRmyPDF v1.0 in the leading German IT magazine c't
• heise Open Source, 09/2014: Texterkennung mit OCRmyPDF
• heise Durchsuchbare PDF-Dokumente mit OCRmyPDF erstellen
• Excellent Utilities: OCRmyPDF
• LinuxUser Texterkennung mit OCRmyPDF und Scanbd automatisieren
• Y Combinator discussion

OCRmyPDF would not be the software that it is today without companies and users choosing to provide support for feature development and consulting enquiries. We are happy to discuss all enquiries, whether for extending the existing feature set, or integrating OCRmyPDF into a larger system.

The OCRmyPDF software is licensed under the Mozilla Public License 2.0 (MPL-2.0). This license permits integration of OCRmyPDF with other code, included commercial and closed source, but asks you to publish source-level modifications you make to OCRmyPDF.

Some components of OCRmyPDF have other licenses, as indicated by standard SPDX license identifiers or the DEP5 copyright and licensing information file. Generally speaking, non-core code is licensed under MIT, and the documentation and test files are licensed under Creative Commons ShareAlike 4.0 (CC-BY-SA 4.0).

The software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.