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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):
    \documentclass{jsarticle}
    
    \bibliographystyle{jplain}
    \title{p\LaTeX\ 実験}
    \author{林蓮枝}
    
    \begin{document}
    
    \maketitle
    
    \begin{abstract}
    本稿では、文書組版システムp\LaTeX{}の使い方を解説します。p\LaTeX{}を利用するときには、あらかじめ文章中に\TeX{}コマンドと呼ばれる組版用の指示を混在させ\ldots
    \end{abstract}
    
    \section{導入}
    こんにちは世界!\cite{確率統計}
    
    \bibliography{refs}
    \end{document}
    
  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 Overleaf menu button above the file list panel.
  4. Set the "Compiler" option to "LaTeX".
  5. Add a blank file to your project, and save it as latexmkrc.
  6. Add the following line to your latexmkrc file:
  7. $latex = 'platex';
    $bibtex = 'pbibtex';
    $dvipdf = 'dvipdfmx %O -o %D %S';
    

This blog post (in Japanese) by doraTeX has further details about using pTeX and upLaTeX on Overleaf.

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