Some documents are too long to read and too important to skip. A lease, an insurance policy, a benefits packet, the manual for the thing that just broke. All four of these tools can take the document and answer your questions about it in plain words, and each one is good at a slightly different way of doing that. Here is one feature per tool, with the official steps and an honest note on when it helps.
Claude: ask questions across a long PDF
Claude can take a long document, or a few documents at once, and let you ask about them in the same chat.
- Open a new chat at claude.ai or in the Claude app.
- Click the plus in the lower left and choose Add files or photos, or drag the file into the message box.
- Ask your question in plain words, for example “what is my notice period and how do I cancel.”
- You can add up to 20 files in one chat, so you can compare a couple of documents side by side. For PDFs under 100 pages, Claude reads the charts and images too, not just the text.
When to reach for it: when the document is long, or when you have two of them to compare, like two insurance quotes or a lease plus the building rules. Keeping them in one chat lets you keep asking follow-ups.
Source: Claude Help Center
ChatGPT: pull the answer out of a document
ChatGPT is good at finding a specific thing inside a dense file and explaining just that part.
- Open ChatGPT on your phone or at chatgpt.com.
- Tap the plus and choose Add photos or files, or drag one in.
- Ask a pointed question, for example “find every mention of a late fee and tell me the amount,” or “summarize the cancellation policy in three lines.”
- It reads PDFs, Word documents, and spreadsheets. Free accounts can upload a few files a day, so save it for the document that matters.
When to reach for it: when you already know what you are hunting for and want the exact passage pulled out and explained, rather than a summary of the whole thing.
Source: OpenAI Help Center
Copilot: summarize a PDF open in your browser
Copilot in Microsoft Edge can read the page or PDF you already have open, so there is nothing to upload.
- Open Microsoft Edge and sign in with a free personal Microsoft account.
- Open the web page or PDF you want to understand.
- Click the Copilot icon in the top right corner to open Copilot in the sidebar.
- Ask it to summarize, or type your own question about the page. The first time, it asks your permission to use what is on the page.
When to reach for it: when the document is already open in your browser and you do not want to download or upload anything, like a PDF a website handed you or a long article. It works best on things you opened from the web. A private or locally stored PDF may not be readable this way. This is the free consumer Copilot, not the paid Microsoft 365 one.
Source: Microsoft Support
Gemini: upload a file or pull one from Drive
Gemini lets you upload a file from your device, or point straight at one that already lives in your Google Drive.
- Go to gemini.google.com or open the Gemini app.
- Click Add files in the text box. Choose Upload Files to pick one from your device, or Add from Drive if it is already in Google Drive.
- Type your question about the file.
- You can add up to 10 files in one prompt. Gemini reads PDFs, Word documents, and more. Adding from Drive needs your Google Workspace connection turned on.
When to reach for it: when the document already sits in your Google Drive and you would rather point at it than download and re-upload it, or when you just want a quick summary and a couple of answers.
Source: Gemini Apps Help
One thing to keep in mind
These tools can miss or misread a detail in a dense document, especially numbers, dates, and fine print. For anything that costs money or affects your health, check the answer against the actual line in the document before you act on it. And think before you upload something with sensitive details in it, like a full account number or an ID, to a tool you do not fully trust.
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