ChatPDF
Free tierChat with any PDF using AI — summarize, ask questions, and extract insights instantly
Free tier available·All audiences·Powered by OpenAI (GPT-4o / GPT-4o-mini dynamic routing)·API available
Key strengths
Purpose-built PDF chat with side-by-side document viewCited sources linked directly to PDF page referencesMulti-file chat across folders of documentsFully multilingual — upload and chat in any languageNo account required to get started
Free tier + paid plans
No ratings yet
Technical Integration & Developer Docs
ChatPDF exposes a public API that allows developers to integrate PDF chat capabilities into their own applications. API documentation is available at the footer of the site under "API Docs."
Supported File Formats:
- PDF (
.pdf), Word (.doc,.docx), PowerPoint (.ppt,.pptx), Markdown (.md), Plain Text (.txt)
AI Model Architecture:
- Dynamic routing between GPT-4o and GPT-4o-mini for optimized latency/quality tradeoffs
- Semantic document indexing for fast retrieval-augmented generation (RAG)
- Inline citation generation maps responses back to exact document segments
Security & Compliance:
- SSL encryption for data in transit and at rest
- SOC2 Type II certified storage provider
- Users retain full control — documents can be deleted at any time
- Shareable document links with revocable access permissions
Multi-document support: Folder-based organization enables cross-document querying, allowing the model to reason across multiple sources in a single conversation context.