Show HN: A browser extension to export tables to CSV, JSON and Markdown

1 llagerlof 0 7/28/2025, 2:06:17 PM addons.mozilla.org ↗

Hi HN,

I made a browser addon called Website Table Exporter for Firefox and Chrome. It lets you export any HTML table on a page to CSV, JSON and Markdown, straight to your clipboard with one click.

Why?

Because copying tables from websites is surprisingly annoying. I kept running into mangled formatting or weird extra markup when trying to grab data for research or personal use. So I built something small, open, and fully client-side. No tracking, no network calls, no nonsense.

Features:

- Export any HTML table to CSV, JSON or Markdown.

- One-click export via a small button in the first cell of each table.

- Automatically strips inner HTML tags.

- Warns if the table has merged cells (which can mess up the output).

- 100% local, no telemetry, no ads.

How to use it:

Install the addon, visit any page with a table, and click the little button that appears in the top-left cell. You can toggle the export buttons visibility clicking the addon button on browser's top bar.

Links:

- Source on GitHub: https://github.com/llagerlof/websitetableexporter

- Firefox Add-on: https://addons.mozilla.org/firefox/addon/website-table-expor...

Would love any feedback, ideas, or bug reports. Thanks!

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Show HN: A browser extension to export tables to CSV, JSON and Markdown

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