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Foarbyld fan CSV Viewer - zero-permissions no-network

CSV Viewer - zero-permissions no-network troch Chris

Securely view CSV files as formatted tables. Drag and drop or browse -- all processing happens locally with ZERO permissions and ZERO network calls. I built this to show CSV files in my browser tab without risking exposing the data to unknown risk

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A lightweight CSV viewer that runs entirely in your browser. Click the toolbar icon, drop a CSV file (or click to browse), and instantly see your data as a clean, readable table.

How it works
  1. Click the CSV Viewer icon in your toolbar
  2. Drag a CSV file onto the page, or click "Choose File"
  3. Your CSV is parsed and displayed as a styled table

Security
  • Requests zero browser permissions
  • Makes no network requests of any kind
  • No external scripts, CDNs, or third-party libraries
  • No data collection, no tracking, no storage
  • Files are read locally using the browser's FileReader API and never leave your machine
  • All cell data rendered via textContent to prevent injection

Features
  • Drag-and-drop or file picker
  • First row displayed as a styled header
  • Alternating row colors and hover highlighting
  • Horizontal scroll for wide tables
  • Shows up to 200 rows with a count notice for larger files
  • Tab title set to the filename
  • "Open another file" button to quickly switch files
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