Tools in this category
Gemini Notebook (NotebookLM)
Google renamed NotebookLM to Gemini Notebook. Import PDFs as sources, ask questions across the materials, and use source references to check the answer.
ChatPDF
ChatPDF adds a question-and-answer interface to an uploaded PDF. Use it to locate a passage before reading that section in context.
Humata
Humata can compare uploaded files or answer a question with document citations. Use its documented Grounded setting when the answer should stay within your sources.
PDF.ai
PDF.ai lets you ask questions about uploaded PDFs and identifies the matching document in its multi-document workflow.
Adobe Acrobat AI Assistant
Acrobat AI Assistant lets you ask questions in Acrobat and follow source references back to the PDF. Use it alongside the document pane.
Smallpdf AI PDF Assistant
Smallpdf offers PDF chat and summaries. Use the summary as a reading guide and check specific conditions in the original PDF.
LightPDF
LightPDF Web adds document chat and summarization to its PDF tools. Use a source file to extract a few defined fields and check them against the page.
Elicit
Elicit lets you use full texts where available and pull comparable details into columns. Use narrow column definitions and check paper-level evidence.
ChatDOC
ChatDOC links generated answers to pages and cited passages. Use those links and highlighted selections to check the source text.
ChatGPT
ChatGPT can work with uploaded documents. Ask for a structured reading note, then verify quotations and page labels in the source PDF.
What to compare
- Check whether the PDF contains selectable text or requires optical character recognition.
- Ask a question with a known answer and verify any page citation against the document.
- For tables, formulas, and contract terms, use the original page to confirm the details before relying on a summary.