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<li class="toctree-l1 current"><a class="current reference internal" href="#">Installing additional language packs</a><ul>
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<div class="section" id="installing-additional-language-packs">
<span id="lang-packs"></span><h1>Installing additional language packs<a class="headerlink" href="#installing-additional-language-packs" title="Permalink to this headline">¶</a></h1>
<p>OCRmyPDF uses Tesseract for OCR, and relies on its language packs for languages other than English.</p>
<p>Tesseract supports <a class="reference external" href="https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc#languages">most languages</a>.</p>
<p>You can often find packages that provide language packs:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="c1"># Display a list of all Tesseract language packs</span>
apt-cache search tesseract-ocr
<span class="c1"># Debian/Ubuntu users</span>
apt-get install tesseract-ocr-chi-sim <span class="c1"># Example: Install Chinese Simplified language back</span>
</pre></div>
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<p>You can then pass the <code class="docutils literal"><span class="pre">-l</span> <span class="pre">LANG</span></code> argument to OCRmyPDF to give a hint as to what languages it should search for. Multiple
languages can be requested using either <code class="docutils literal"><span class="pre">-l</span> <span class="pre">eng+fre</span></code> (English and French) or <code class="docutils literal"><span class="pre">-l</span> <span class="pre">eng</span> <span class="pre">-l</span> <span class="pre">fre</span></code>.</p>
<div class="section" id="known-limitations">
<h2>Known limitations<a class="headerlink" href="#known-limitations" title="Permalink to this headline">¶</a></h2>
<p>As of v4.2, users of ocrmypdf working languages outside the Latin alphabet should use the following syntax:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>ocrmypdf -l eng+gre --output-type pdf --pdf-renderer tesseract
</pre></div>
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<p>The reasons for this are:</p>
<ul class="simple">
<li>The latest version of Ghostscript (9.19 as of this writing) has unfixed bugs in Unicode handling that generate invalid character maps, so Ghostscript cannot be used for PDF/A conversion</li>
<li>The default “hocr” PDF renderer does not handle Asian fonts properly</li>
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