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74 lines
2.4 KiB
ReStructuredText
74 lines
2.4 KiB
ReStructuredText
.. _lang-packs:
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====================================
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Installing additional language packs
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====================================
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OCRmyPDF uses Tesseract for OCR, and relies on its language packs for all languages.
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On most platforms, English is installed with Tesseract by default, but not always.
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Tesseract supports `most
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languages <https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc#languages>`__.
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Languages are identified by standardized three-letter codes (called ISO 639-2 Alpha-3).
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Tesseract's documentation also lists the three-letter code for your language.
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Some are anglicized, e.g. Spanish is ``spa`` rather than ``esp``, while others
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are not, e.g. German is ``deu``.
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After you have installed a language pack, you can use it ``ocrmypdf -l <language>``,
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for example ``ocrmypdf -l spa``. For multilingual documents, you can specify
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all languages to be expected, e.g. ``ocrmypdf -l eng+fra`` for English and French.
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English is assumed by default unless other language(s) are specified.
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For Linux users, you can often find packages that provide language
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packs:
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Debian and Ubuntu users
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=======================
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.. code-block:: bash
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# Display a list of all Tesseract language packs
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apt-cache search tesseract-ocr
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# Install Chinese Simplified language pack
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apt-get install tesseract-ocr-chi-sim
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You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as
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to what languages it should search for. Multiple languages can be
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requested using either ``-l eng+fre`` (English and French) or
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``-l eng -l fre``.
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Fedora users
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============
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.. code-block:: bash
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# Display a list of all Tesseract language packs
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dnf search tesseract
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# Install Chinese Simplified language pack
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dnf install tesseract-langpack-chi_sim
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You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as
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to what languages it should search for. Multiple languages can be
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requested using either ``-l eng+fre`` (English and French) or
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``-l eng -l fre``.
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macOS users
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===========
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You can install additional language packs by
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:ref:`installing Tesseract using Homebrew with all language packs <macos-all-languages>`.
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Docker users
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============
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Users of the OCRmyPDF Docker image should install language packs into a
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derived Docker image as
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:ref:`described in that section <docker-lang-packs>`.
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Windows users
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=============
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The Tesseract installer provided by Chocolatey already includes 100 languages.
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