Best-of · 5 tools · updated Nov 3, 2026

Best Free AI Tools for Chatting with PDFs

When choosing a free tool for chatting with PDFs, check how many files and pages the free tier allows, whether answers cite source passages, and whether it handles one document or several. ChatPDF is fast for a single PDF and cites passages. Humata lets you upload multiple files and query across them with source references. NotebookLM grounds answers in your uploaded sources, cites exact passages, and can create audio overviews.

  1. 1
    ChatPDFVerified Nov 4, 2026

    Upload a document, ask questions in plain language, and get answers with page citations.

    Free tierWeb
    Visit
  2. 2
    Kimi

    Long-context assistant that reads huge documents.

    Free tier
    Visit
  3. 3
    NotebookLM

    Google's AI notebook that grounds every answer in your uploaded documents, PDFs and audio files with source citations.

    Free tier · from $9.99/moWeb, iOS, Android
    Visit
  4. 4
    HumataVerified Nov 4, 2026

    Lets researchers, students, and teams ask questions across their PDFs and get answers with citations.

    Free tier · from $9.99/moWeb
    Visit
  5. 5
    Claude

    Anthropic's AI assistant with a long context window, nuanced reasoning and strong performance on writing and analysis.

    Free tier · from $20/moWeb, iOS, Android, API
    Visit