LocalBridge

Spreadsheets to Claude

How to send spreadsheets to Claude

You have spreadsheets open and a question that spans all of them. This walks through what Claude actually receives, what it will not get, and how to phrase the question so the extra context earns its place.

What gets captured

From spreadsheets, LocalBridge takes the visible cell text of the sheet you have open. Page furniture such as navigation, sidebars and cookie notices is dropped before anything is sent, which keeps the batch small enough for Claude to reason over rather than skim.

Claude has a large context window, so it handles several long pages at once without losing the earlier ones.

Step by step

  1. Step 1

    Open the pages you care about

    Put the spreadsheets you want answered in one browser window. Leave out everything unrelated: irrelevant pages cost context and pull the answer off topic.

  2. Step 2

    Tick the tabs to send

    Open LocalBridge and tick each tab. It reads the visible cell text of the sheet you have open, and drops navigation, sidebars and cookie banners.

  3. Step 3

    Send to Claude

    Click the Claude button. The pages arrive as a numbered list, each with its title and URL, so you can refer to source two by name.

  4. Step 4

    Ask the question that needed all of them

    Follow the context with something only the full set can answer. For example: "Describe the trend in this data and flag anything that looks wrong."

Where it falls short

Only the rendered viewport is captured, so scroll to the range that matters first.

Published 2026-09-15. If Anthropic changes how Claude handles pasted context, this guide is updated rather than left to drift.

Common questions

Does Claude read the whole of each page?
It reads what LocalBridge captured: the visible cell text of the sheet you have open. Each page is capped so one long document cannot crowd out the rest of the batch, and claude has a large context window, so it handles several long pages at once without losing the earlier ones.
What does not come through from spreadsheets?
Only the rendered viewport is captured, so scroll to the range that matters first.
Do I need to be signed in for spreadsheets behind a login?
Yes. LocalBridge reads the page exactly as your browser already renders it, so if the tab shows the content, it is captured. It never logs in for you and never stores credentials.
How many spreadsheets can I send at once?
Up to eight tabs per send, trimmed so the batch stays inside a comfortable context budget. For bigger sets, send them in themed batches and ask one question per batch.
Is the page content stored anywhere?
No. The text goes from your browser to the assistant you chose. LocalBridge does not keep a copy and does not send page content to our servers.

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