Copy spreadsheet rows into long web forms with Claude and a browser tool
Idea + starter prompt, not run by us yet
For: Admins who retype the same spreadsheet data into web forms
The one hands-on report in this forum thread came from a commenter who had Claude drive a browser through Playwright MCP to fill long forms from sheet data. It worked, but slowly, and with odd formatting mistakes until they told it to screenshot and recheck each field.
Steps
- Add the Playwright MCP server to Claude so it can control a browser.
- Make a copy of your sheet with just three test rows, and use a practice version of the form if one exists.
- Say clearly in the prompt that Claude must take a screenshot and recheck each field after filling it.
- Compare every filled field with the sheet yourself. The commenter saw formatting mistakes without that check.
- If the form layout stays the same after a few trial runs, ask Claude to turn the steps into a fixed script. The commenter found that faster.
Starter prompt
Fill the web form at [form URL] using rows from [sheet copy]. Use only my test copy, [3] rows at first, and do not press the final submit button. Before you start, show me the plan: which sheet column goes into which form field, and how you will format dates, phone numbers and amounts. After each field, take a screenshot and check that it matches the sheet. List every mismatch. I will log in myself, so never ask me for passwords. Stop and ask me if the form changes or looks different than expected. Use only synthetic rows with invented contact details in a practice form. Do not use real personal data or payment card numbers. Keep screenshots in the test folder. If no practice form is available, stop after showing the field mapping.
Original post: Reddit · found via agentusecases.ai. Written up in our own words. We haven't run it, so test it on made-up data first.