Based on our record, PDF to Text seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If you still want to proceed, I suggest you first manually convert each pdf to a .txt file with https://pdftotext.com/. I tried working with the actual monster manual pdf and it's a big mess. Although it looks pretty in a pdf viewer, the textual representation is highly irregular. The .txt version I got from that website is nice. Source: about 2 years ago
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Geekersoft PDF to Text - PDF-to-TXT converter will help you convert PDF files to TXT files online for free. - Geekersoft free PDF to TXT