How to Use Claude for Long Documents

On Claude Sonnet 4 on AskAI.free, drag-and-drop your PDF, doc or text file into the chat. Multimodal Claude reads PDFs natively — including images and tables — but text-based PDFs work best.

Don't assume Claude read everything just because it accepted the file. Always start with:

"Confirm you can see this document. What's its title, length, and overall structure (sections, chapters)?"

If Claude can't summarise the structure, retry the upload. Don't ask substantive questions until you've confirmed the document loaded.

Long-context models work best when your question maps to specific sections of the document. Bad question:

"Summarise this 300-page contract."

Better questions:

• "What does Section 8 say about termination?"
• "Find every place that mentions data retention. Quote the relevant clauses."
• "List all the financial obligations of party A, with the page numbers."

Always ask Claude to cite which page or section a claim comes from:

"For every answer, quote the relevant sentence and give the page or section number it appears in."

This forces Claude to actually retrieve from the document instead of guessing. It also lets you verify quickly.

Claude keeps the whole document in context for the entire conversation, so you can ask follow-ups indefinitely. Use this for deep dives:

• "In the section you just quoted, what does 'reasonable efforts' typically mean in contract law?"
• "Compare the termination clauses to standard SaaS contracts."
• "Which clause is most unfavourable to me as the buyer?"

Even with 200K context, Claude (and every other long-context model) pays slightly less attention to information in the middle of a long document. Beginning and end get more weight.

If you're working with a critical document, ask explicitly: "Have you actually read the middle sections? Quote one sentence from page 100." If Claude can't, you may need to chunk the document.