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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Markdown table generator, like a spreadsheet

Build a Markdown table without typing a single pipe - here in this tab, with nothing uploaded.

How to markdown table generator

Type into the grid, or paste cells from Excel or Sheets.
Add rows and columns, and set each column's alignment.
Copy the Markdown table.

Why this one stays private

A table is often somebody's numbers. This builds yours in the tab and sends nothing anywhere.

Questions

Can I paste from a spreadsheet?

Yes - paste into any cell and the grid grows to fit what you copied.

Can I edit an existing Markdown table?

Yes. Paste the Markdown table into the grid's first cell and it is read back into rows and columns.

What does 'Align columns' do?

It pads the cells so the pipes line up in the source, which makes the table readable as plain text too.