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Private Data Tool in One Offline HTML File

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The prompt

Build me a small tool as one self-contained HTML file that runs offline in the browser, so my data never leaves my computer and never goes to an AI. What it should do: [e.g. load a CSV of expenses and show totals by category and month / compare two Excel exports and highlight changed rows / clean a contact list and remove duplicates] Who will use it: [me / non-technical colleagues] Example of the data columns (made-up sample rows, not real data): [ ] Requirements: - One .html file with inline CSS and JavaScript. No network calls, no CDN links, no analytics, no external fonts. - Load files with a file picker or drag-and-drop; parse them in the browser. - Show results in a clear table plus [one simple chart, drawn with canvas or SVG]. - An 'Export results as CSV' button. - Clear error messages for wrong file formats. - Works in current Chrome, Edge and Firefox. After the code, list exactly how I can confirm it makes no network requests (e.g. open it with Wi-Fi off).

Why this prompt

• Hand-picked, editorially reviewed prompt
• Written for Claude, ChatGPT, Gemini

Source

Created by BestPromptFinder — editorial prompt, not user-generated. See our content & source policy.

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