Is there a package which converts PDF to LaTeX? I have the PDFs created using TeX but I have lost the original
Can I retrieve the TeX back from PDF?
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On the tex stackexchange page you can find this discussion.
A short answer to your question: No.
But there are some tools which can help you to make a tex from a pdf.
Use the writer2latex plugin in LibreOffice
The command line version can be found on the Writer2Latex page.
If you have a lots of mathematics in it, try InftyReader.
If you have a pure text document you can simply convert the text to a
pdftotext myDocument.pdf MyDocument.txt
and make a new latex document from it.