TSV → Markdown Table

When you select cells in Excel, Google Sheets or LibreOffice and copy, what lands on the clipboard is tab-separated text. That is why pasting it straight into a README gives you an unaligned mess: Markdown does not read a tab as a column boundary, it expects pipes and a separator line under the header.

Paste what you copied from the spreadsheet and the page builds the table in the format GitHub, GitLab and most renderers expect. The first row becomes the header, the separator line is generated for you, and you choose the column alignment — left, centre or right — which in Markdown is set by where the colons sit on that line of dashes.

Two practical notes. The alignment you pick applies to every column at once; to mix alignments, edit the separator line by hand afterwards. And empty trailing cells in a spreadsheet row are sometimes not copied at all: rows shorter than the header are padded with empty cells, so the table comes out rectangular in any renderer.