Can I ask questions about many PDFs at once?

Yes. Uploading one PDF to a chatbot covers one conversation. A library such as BrainTube keeps every PDF you save, so a question is answered across all of them, with links to the documents used.

How do I do it on iPhone?

Open the PDF in Files, Mail or Safari, tap Share and choose BrainTube. Then ask Cue in the app.

Does it show where the answer came from?

Yes. Cue's answers link back to the exact sources in your library, so you can check the original.

Can ChatGPT or Claude read my saved PDFs?

With BrainTube connected over MCP, Claude, ChatGPT and Cursor can search your library, PDFs included. Setup takes a few minutes: see the MCP guide.

BrainTube is free with 30 credits a month plus credits you earn. Starter and Pro add more credits and bulk imports.

Guide · PDFs you can ask

How to Ask Questions About Your PDFs (With Sources)

Dropping a PDF into a chatbot works for one conversation. Then it is gone. Here is how to keep every PDF you care about in one place and ask questions across all of them, with sources.

By Ilian Raykov, founder of BrainTube

The short answer

Share or upload each PDF to BrainTube once.
Ask Cue a question; the answer cites the documents it used.
Connect Claude, ChatGPT or Cursor over MCP to ask from there too.

Step by step

1. Save the PDF to BrainTube

On iPhone, open the PDF in Files, Mail or Safari, tap Share and choose BrainTube. On a computer, upload it on brain-tube.com. The text is extracted, summarised and filed in your library.

2. Keep saving

Add every report, paper or manual you want to keep. They sit in one library next to your saved videos, articles and voice memos.

3. Ask a question

Ask Cue in plain language, for example "what did the Q3 report say about churn?". The answer is built from what you saved and links back to the exact documents.

4. Ask from your AI tools too

Connect Claude, ChatGPT or Cursor to BrainTube over MCP and they can search the same PDFs while you work.

Why a library beats one-off uploads

A chat upload answers questions about one file, inside one chat. A library keeps the PDF with everything else you saved, so a question can pull from a report, a video and a voice memo at once, and you can come back to it next month.

iPhone: get BrainTube on the App Store and share PDFs from Files, Mail or Safari.
Web: upload on brain-tube.com.
AI tools: connect Claude, ChatGPT and Cursor to your knowledge base.

Frequently asked

Can I ask questions about many PDFs at once?: Yes. Uploading one PDF to a chatbot covers one conversation. A library such as BrainTube keeps every PDF you save, so a question is answered across all of them, with links to the documents used.
How do I do it on iPhone?: Open the PDF in Files, Mail or Safari, tap Share and choose BrainTube. Then ask Cue in the app.
Does it show where the answer came from?: Yes. Cue's answers link back to the exact sources in your library, so you can check the original.
Can ChatGPT or Claude read my saved PDFs?: With BrainTube connected over MCP, Claude, ChatGPT and Cursor can search your library, PDFs included. Setup takes a few minutes: see the MCP guide.
Is it free?: BrainTube is free with 30 credits a month plus credits you earn. Starter and Pro add more credits and bulk imports.

Save once. Query anywhere.

Your YouTube library, in the AI tools you already use.

Start free