Best AI tools for chatting with PDFs and documents
Upload a contract, report or paper and ask questions about it. These tools work with your own files, and some ground their answers in them with citations.
Ranked by score on our 100-point rubric (how we score). Scores are initial editorial estimates from public information, not hands-on tests. Pricing is labeled verified (checked on the vendor's official pricing page, with date) or unverified. Tools from more than one category appear here; each is scored within its own primary category.
Quick picks
| # | Tool | Tier | Score |
|---|---|---|---|
| 1 | ChatGPT General AI assistant from OpenAI | S | 88 |
| 2 | Claude AI assistant from Anthropic | S | 88 |
| 3 | Gemini Notebook (formerly NotebookLM) Research notebook grounded in your sources | A | 80 |
| 4 | ChatPDF Chat with PDF documents | B | 57 |
The ranking
-
Assistant with search, deep research, file analysis, image generation and agent mode.
- Best for
- You want one assistant that does almost everything.
- Skip it if
- You need strict on-prem privacy.
- Pricing
- Free tier; paid Plus and Pro plans unverified editorial summary, not yet confirmed on an official pricing page
- Platforms
- web · Mac · Win · iOS · Android
-
Assistant known for writing, coding and long documents, with projects, artifacts and research.
- Best for
- You want strong writing, analysis and coding help.
- Skip it if
- You need built-in image generation.
- Pricing
- Free plan; Pro $20/mo monthly or $17/mo billed annually; Max from $100/mo ✓ verified on the official pricing page, Oct 18, 2026
- Platforms
- web · Mac · Win · iOS · Android
-
notebooklm.google now redirects here. Google research tool that analyzes your uploaded sources, answers grounded questions and turns content into overviews.
- Best for
- You want to study or synthesize your own documents.
- Skip it if
- You need open-web research.
- Pricing
- Free; higher limits with Google AI plans unverified editorial summary, not yet confirmed on an official pricing page
- Platforms
- web · iOS · Android
-
Upload PDFs and ask questions with cited answers.
- Best for
- You want quick Q&A on a PDF.
- Skip it if
- You need batch processing.
- Pricing
- Free tier; Plus paid unverified editorial summary, not yet confirmed on an official pricing page
- Platforms
- web · API
Head-to-head comparisons
- ChatGPT vs Claude
- ChatGPT vs Gemini Notebook (formerly NotebookLM)
- Claude vs Gemini Notebook (formerly NotebookLM)
FAQ
What is the best AI tool for chatting with PDFs and documents?
ChatGPT ranks first with 88/100 (S-tier). General AI assistant from OpenAI. Use it when you want one assistant that does almost everything. Next in our ranking: Claude (88/100, S-tier) and Gemini Notebook (formerly NotebookLM) (80/100, A-tier).
Which AI tools for chatting with PDFs and documents have a free tier?
In our pricing data, ChatGPT (unverified), Claude (verified), Gemini Notebook (formerly NotebookLM) (unverified) and ChatPDF (unverified) list a free tier. "Unverified" means it is an editorial summary we have not yet confirmed on the vendor's official pricing page, so check the vendor before relying on it.
How are these tools ranked?
Each tool is scored out of 100 on our public rubric: job fit (30), ease (15), value (15), momentum (15), openness and portability (10), trust and maturity (10) and a builder/gamer bonus (5). S-tier is 85+, A-tier 70–84, B-tier 55–69 and C-tier below 55. This guide mixes tools from more than one category, and scores are calibrated within each tool's primary category, so treat cross-category gaps as rough. Current scores are initial editorial estimates from public information, not hands-on tests, and sponsors can't buy points.