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Yes, Overleaf can compile Japanese documents that require pTeX. Here's how:

  1. A pTeX document does not need any special commands for Japanese text (kanji, hiragana and katakana). Here's a simple example (using the jsarticle document class):
    \title{p\LaTeX\ 実験}
  2. If you are uploading a .tex file from elsewhere, make sure it is saved in UTF-8 encoding.
  3. In the Overleaf editor, click on the "Settings" button (i.e. the gear icon next to your username in your project window).
  4. Under "Advanced Build Options", from the dropdown list, select "LaTeX dvipdf". Then click "Save settings".
  5. Add a blank file to your project, and save it as latexmkrc.
  6. Add the following line to your latexmkrc:
  7. $latex = 'platex';
    $bibtex = 'pbibtex';

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