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OCR-powered screen-capture tool to capture information instead of images.

Project description


OCR powered screen-capture tool to capture information instead of images. For Linux, macOS and Windows.

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Links: Source Code | Documentation | FAQs | Releases | Changelog



Choose one of the options for a prebuilt release. If you encounter an issue please take a look at the FAQs or report it.




Note: You have to allow the unsigned application on first start: "System Preferences" → "Security & Privacy" → "General" → "Open anyway". You also have to allow NormCap to take screenshots. (#135)

* Might be available delayed, as it is currently build/uploaded manually. (Thx, @Takrin!)

Install Python package

As an alternative to a prebuilt package from above you can install the NormCap Python package for Python >=3.9, but it is a bit more complicated:

On Linux

# Install dependencies (Ubuntu/Debian)
sudo apt install build-essential tesseract-ocr tesseract-ocr-eng libtesseract-dev libleptonica-dev wl-clipboard

## Install dependencies (Arch)
sudo pacman -S tesseract tesseract-data-eng wl-clipboard

## Install dependencies (Fedora)
sudo dnf install tesseract wl-clipboard

## Install dependencies (openSUSE)
sudo zypper install python3-devel tesseract-ocr tesseract-ocr-devel wl-clipboard

# Install normcap
pip install normcap

# Run

On macOS

# Install dependencies
brew install tesseract tesseract-lang

# Install normcap
pip install normcap

# Run

On Windows

1. Install Tesseract 5 by using the installer provided by UB Mannheim.

2. Identify the path to Tesseract base folder. It should contain a /tessdata subfolder and the tesseract.exe binary. Depending on if you installed Tesseract system-wide or in userspace, the base folder should be:

C:\Program Files\Tesseract-OCR



3. Adjust environment variables:

  • Create an environment variable TESSDATA_PREFIX and set it to your Tesseract base folder, e.g.: "System Properties" → Tab "Advanced" → "Environment Variables..." → "New..." → Variable: TESSDATA_PREFIX, Value: "C:\Program Files\Tesseract-OCR"

  • Append Tesseract's base folder to the environment variable PATH, e.g.: "System Properties" → Tab "Advanced" → "Environment Variables..." → Section "User variables" → Select PATH → "Edit..." → Add a new entry "C:\Program Files\Tesseract-OCR"

  • To test your setup, open a new cmd-terminal and run:

    tesseract --list-langs

4. Install and run NormCap:

# Install normcap
pip install normcap

# Run

Why "NormCap"?




Prerequisites for setting up a development environment are: Python >=3.9, hatch and Tesseract >=5.0 (incl. language data).

# Clone repository
git clone

# Change into project directory
cd normcap

# Create virtual env and install dependencies
hatch env create

# Register pre-commit hook
hatch run pre-commit install

# Run NormCap in virtual env
hatch run python -m normcap


This project uses the following non-standard libraries:

  • pyside6 - bindings for Qt UI Framework

And it depends on external software:

Packaging is done with:

  • briefcase - converting Python projects into standalone apps

Thanks to the maintainers of those nice tools!

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