Chat with any PDF — and get answers you can verify
Upload a PDF and ask questions in plain English. Silas reads the whole document and answers with citations to the exact page, so you never have to wonder whether the AI actually read it.
How chatting with a PDF works
Upload your PDF
Drag in a PDF — a contract, paper, manual, or report. Word documents, spreadsheets, and images work too. Silas reads every page, including tables and scans.
Ask in plain English
Ask anything: “What are the termination clauses?”, “Summarize the methodology”, “What does section 4.2 say about liability?” Pick Claude, Gemini, GPT, or DeepSeek.
Get cited answers
Every answer links back to the exact file, page, and section it came from. Click a citation to verify it yourself — no guessing whether the AI made it up.
Scale to whole folders
Ask one question across hundreds of PDFs at once. Silas stays precise as your library grows instead of getting vaguer with every file you add.
Why not just paste the PDF into ChatGPT?
General chatbots skim long files and often guess at the parts they didn't read — and they rarely tell you which page an answer came from. That's fine for casual questions, but not when the answer has to be right: a clause in a contract, a number in a financial report, a step in a technical manual.
Silas indexes the entire document and only answers from what is actually in it. Every claim in the answer carries a citation you can click to see the original passage — the file, the page, even the section. If the answer isn't in your documents, Silas says so instead of inventing one. Read more about how cited answers work, or see how Silas compares to NotebookLM.
Frequently asked questions
How do I chat with a PDF?
Upload the PDF to Silas, then ask questions in plain English. Silas reads the full document — including tables, scanned pages, and figures — and answers with citations that link back to the exact page.
Can I chat with multiple PDFs at once?
Yes. Put PDFs in a folder and ask questions across all of them. Silas finds the relevant passages in each file and cites which document and page every part of the answer came from.
How large can the PDF be?
Silas handles long documents like textbooks, contracts, and technical manuals. Unlike tools that skim or only read the first pages, it indexes the entire file so answers can come from anywhere in the document.
Does it work with scanned PDFs?
Yes. Scanned pages are processed with document understanding models, so you can ask questions about scans, images, and tables — not just selectable text.
Which AI models can I use?
You can ask Claude, Gemini, GPT, or DeepSeek about the same PDF and switch models mid-conversation without re-uploading anything.