PDFSeek

Drop in a 40-page research paper, ask what the methodology was, and get an answer with a citation pointing to the exact spot in the PDF.

That is the core use of PDFSeek, an AI PDF tool for translation, summarization and research that works across multiple languages.

A side-by-side view keeps the original document next to the response, so you can check claims against the source instead of trusting them blindly.

PDFSeek also lets you chat across several files at once, which suits students or researchers comparing papers on one topic.

Translation is the other half: documents can be translated between languages with the same AI.

The pricing has a catch.

The free version needs no sign-up for basic use, but translation is limited to 50 pages a month.

The Plus membership raises that to 100 pages a month, adds the advanced translation engine, and is the only plan with PDF chat.

If chat is why you came, plan on paying.