A chat-with-PDF app lets you upload a PDF and ask questions about it in plain language, with answers drawn from the file.
In plain words
There are two common ways to build one. The file can go straight to a model that reads PDFs: the text of every page is pulled out and each page is also turned into an image, so charts and tables count too. Dense or very long files can overflow the model's context, so another route uses retrieval: the app splits the PDF into chunks, indexes them, and at question time hands only the closest chunks to the model.
A quick example
Imagine uploading a 40-page school handbook and asking "When is the last day to change classes?" The app finds the passages about schedule changes, gives them to the model with your question, and shows an answer based on those passages.
Where you'll meet it
- Reading reports, manuals and papers faster.
- A classic first project for learning retrieval (RAG).
Related
Sources
- DocsPDF support, Anthropic (Claude Platform Docs) · read 29 Sept 2026
- DocsFile inputs (PDF files), OpenAI API docs · read 29 Sept 2026
- DocsBuild a semantic search engine with LangChain, LangChain docs · read 29 Sept 2026
Checked by WhatIsAI against the sources above · 29 Sept 2026. Spotted an error? Report it.