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)·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
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ChatPDF exposes a public API for developers who want to embed document-chat functionality into their own products or workflows. Key technical details:
- Model backend: OpenAI GPT-4o and GPT-4o-mini, with dynamic routing for speed/quality optimization
- Supported input formats: PDF, Word, PowerPoint, Markdown, plain text
- Citation system: Responses include cited sources with clickable references linked to precise locations in the source document
- Multi-file support: API and UI both support multi-document chat sessions
- Multilingual: Accepts uploads and queries in any language
- Security: SOC2 Type II certified storage; SSL encryption in transit
- Pricing tiers: Free (2 documents/day, no account required); ChatPDF Plus (unlimited document analysis, advanced features)
Refer to the ChatPDF developer documentation for endpoint references, authentication details, and request/response schemas.
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