Building a tabular by hand is the most reliably irritating ten minutes in academic writing: alignment letters to count, & and \\ to escape, and one unescaped % or _ to break the whole build. Paste a table from a spreadsheet or a markdown file and this writes the LaTeX, picks the column alignment from what is in the cells, and escapes everything that needs escaping.

Runs entirely in the browser — your table is never uploaded. Auto-alignment calls a column numeric when most of its cells parse as numbers after stripping currency, thousands separators and percentage signs; anything else is text. Check the output before you ship it: booktabs needs \usepackage{booktabs} in the preamble, and \resizebox needs graphicx.