Chat with Multiple PDFs
Chat with Multiple PDFs at Once Using Our AI Knowledge Base
AskYourPDF lets you chat with multiple PDFs at once by grouping them into a single AI Knowledge Base. Drop in five, thirty, or 150 PDFs, ask one question in plain English, and get one synthesised answer drawn from across every file, with citations to the exact page and document.
Used by 5,000,000+ readers · GDPR-compliant · UK-hosted
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What is an AI Knowledge Base for PDFs, and who is it for?
An AI Knowledge Base for PDFs is a collection of documents you can chat with as a single corpus. Instead of opening files one at a time, you upload your PDFs into one Knowledge Base and ask it questions. The AI retrieves the most relevant passages from across every document, synthesises one answer, and shows the citations. AskYourPDF lets you chat with up to 150 documents per day in this way.
The technical pattern behind this is retrieval-augmented generation, or RAG. You do not need to know how RAG works to use it. AskYourPDF handles the chunking, embedding, retrieval, and synthesis automatically. What you see is a single chat window connected to your entire library, returning one cited answer per question. The Knowledge Base feature is included on every paid plan and runs on GPT-5, GPT-5.2, Gemini 2.5, and Claude 4.5.
If you are a graduate researcher running a literature review across 80 papers, an in-house lawyer searching clauses across a contract archive, an analyst comparing competitor reports across an industry, or a customer support lead building an internal knowledge base from your existing help docs, this page is for you. AskYourPDF Knowledge Bases are built for the work where the answer is never in just one PDF.
How to chat with multiple PDFs in three steps
Three steps from a folder of PDFs to a cited answer across the whole library.
Create a Knowledge Base and upload your PDFs
From your AskYourPDF dashboard, create a new Knowledge Base, name it (e.g. "Vendor contracts 2025" or "Thesis references"), and drag your PDFs into the upload area. Each Knowledge Base supports 50 documents per day on Premium, 150 on Pro, and 1,000 on Enterprise.
Pick the AI model that fits your sources
AskYourPDF lets you chat with multiple PDFs on every frontier AI model. Switch to Claude 4.5 Opus for legal and academic libraries, GPT-5 for general business reading, or Gemini 2.5 Pro for libraries that span multiple languages. The model picker sits above the chat input.
Ask one question, get one cited answer
Type your question in plain English. AskYourPDF retrieves the most relevant passages from across every document in the Knowledge Base, synthesises one answer, and shows citations linking back to the exact page in each contributing PDF. Ask follow-ups and the AI keeps the whole library in mind.
What you can do when you chat with multiple PDFs on AskYourPDF
Each capability below is a job you can do with one AskYourPDF Knowledge Base.
Chat with up to 150 PDFs per day in one Knowledge Base
Premium supports 50 documents per day per Knowledge Base. Pro raises it to 150. Enterprise is up to 1,000. The chat reads across the entire library and returns one synthesised, cited answer per question.
Run a literature review across your reading list
Researchers upload their entire reading list into one Knowledge Base, then chat with the literature instead of reading every paper end to end. Surface consensus, find contradictions, and pull cited evidence into your draft.
Build a searchable contract archive
Legal teams group contracts, NDAs, and MSAs into a single Knowledge Base, then ask the AI to find clauses, compare language across vendors, or summarise obligations on demand. Claude 4.5 Opus is recommended for legal precision.
Compare reports across an industry
Strategy and finance teams drop industry reports, regulator filings, and competitor 10-Ks into a Knowledge Base and chat with the whole library before a Monday brief. One question, one cited synthesis.
Share a Knowledge Base with your team
Knowledge Bases support shared access through a private link on Premium and Pro. Enterprise adds role-based permissions and SSO, so a team can chat with the same multi-PDF library from anywhere.
Embed a Knowledge Base on your website
Use the Document Widget to embed a chat interface on your internal portal or marketing site, so visitors or staff can chat with your multi-PDF library directly. No engineering build required.
Power your product with the Knowledge Base API
Developers can use the AskYourPDF API to build a multi-PDF chat interface inside their own SaaS, with the same multi-model backend that powers AskYourPDF. Endpoints for upload, retrieval, and chat are documented.
Sync your reading library with Zotero
Researchers using Zotero can connect their reference manager to AskYourPDF and chat with the PDFs in their Zotero library without uploading anything separately.
Why AskYourPDF Knowledge Base, not a generic AI chatbot
Side by side with the alternatives, so you can see exactly what changes when you choose AskYourPDF to chat with multiple PDFs.
| Capability | Typical "free" multi-PDF chat tool | Generic AI chatbot | AskYourPDF |
|---|---|---|---|
| Open or chat with multiple PDFs in a PDF | Yes (5 messages) | No | Yes (full chat) |
| Document length supported | 10 to 20 pages | Tight context window | Up to 6,000 pages on Pro |
| Cited answers tied to source page | No | No | Yes |
| OCR for scanned PDFs | No | No | Yes, on Premium and above |
| Multi-model AI (GPT-5, Claude 4.5, Gemini 2.5) | No | Single model only | Yes |
| Multi-document chat (Knowledge Base) | No | Limited by context | Yes, on Premium and above |
| Works on web, mobile, Chrome, Zotero, ChatGPT | Limited | Web only | Yes |
| Risk-free way to try paid plan | Free with hidden caps | Subscription only | $1 Trial, cancel any time |
| Data used to train external AI | Often | Often | Never |
| Privacy and compliance | Rarely disclosed | Rarely disclosed | GDPR, UK-hosted |
Generic AI chatbots cannot hold a library of PDFs in context at once. AskYourPDF can. That is why teams running real research, contract, and analyst workflows pick AskYourPDF when they need to chat with more than one PDF at a time.
Built for the multi-PDF work you actually do
Pick the situation that sounds like yours.
You are running a literature review across 80 papers
Drop your Zotero library into a Knowledge Base and chat with the whole reading list. Switch to Claude 4.5 Opus for academic reasoning depth.
You are searching clauses across a contract archive
Group every vendor contract into one Knowledge Base and ask the AI to find clauses, compare language, or summarise obligations across the archive.
You are comparing reports across an industry
Drop competitor 10-Ks, earnings transcripts, and industry studies into one library and ask the AI for one synthesis with cited evidence.
You are building a course pack or study library
Group your textbooks and readers into one Knowledge Base and chat with them all before exam week. Get cross-document quizzes and summaries.
You are maintaining an internal knowledge base
Use the Document Widget or API to power chat against your team's policies, runbooks, and product documentation, all from one Knowledge Base.
You are building a multi-PDF chat feature in your own product
Developers can use the AskYourPDF Knowledge Base API to add chat-with-many-PDFs to their own SaaS, with the same multi-model backend.
Why people stay with AskYourPDF Knowledge Bases
5,000,000 readers · Up to 150 docs per day per Knowledge Base · 6,000 pages per file on Pro · GDPR-compliant · UK-hosted · Multi-model AI included
“Our research group chats with 200 papers per Knowledge Base. The cross-citations across the library are what makes it useful for a real literature review.”
Daniel R.
Postdoctoral Researcher
“Every vendor contract we have ever signed sits in one Knowledge Base. Finding the clause I need now takes one question instead of an afternoon.”
Sophie L.
Legal Operations Lead
“I rebuilt our investor brief workflow around AskYourPDF Knowledge Bases. The cited answers shipped a 30-page deck in two days instead of two weeks.”
Marcus T.
Strategy Director
Knowledge Base pricing, without the sales tactic
Knowledge Bases are included on every paid plan. Both Premium and Pro start with a $1 Trial for three days, so you can build a real Knowledge Base with your own PDFs before you commit.
Pro
Recommended
- 150 docs per day
- 6,000 pages per doc.
- All Premium features
- Longer reply length
- Priority support
- Priority access to new features
- Claude 4.5 Opus
- Gemini 2.5 Pro via credits
Questions you might be asking about chatting with multiple PDFs
How many PDFs can a Knowledge Base hold?
Up to 50 documents per day on Premium, 150 on Pro, and 1,000 on Enterprise. There is no hard cap on total Knowledge Base size; the daily limit refers to new uploads.
Can my team chat with the same multi-PDF Knowledge Base?
Yes. Premium and Pro support shared access via a private link. Enterprise adds role-based permissions and SSO for full team workflows.
Can I embed a Knowledge Base on my website?
Yes. Use the Document Widget on any paid plan to embed a chat interface on your site or internal portal. Visitors can chat with your multi-PDF library directly.
Does the Knowledge Base support scanned PDFs?
Yes. OCR is included on Premium, Pro, and Enterprise, so scanned contracts, archived reports, and image-based PDFs all join the same Knowledge Base.
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