CSV Viewer - zero-permissions no-network by 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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About this extension

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

Click the CSV Viewer icon in your toolbar
Drag a CSV file onto the page, or click "Choose File"
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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