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TSV → CSV

Convert TSV to CSV online

The two formats differ by one character, which is exactly why the conversion goes wrong so often. Every cell that already contains a comma has to be quoted on the way out, and a tool that forgets turns one column into two without saying a word.

How to do it

  1. Open the editor and drop your .tsv file onto it, or paste the rows straight from wherever you copied them.
  2. Check the cells and the review panel. A comma, quote or line break inside a value affects quoting; the export dialog shows the effective quoted-field mode and any required conversion.
  3. Choose Export, pick CSV, and set the line ending you need — LF for anything Unix-shaped, CRLF if a Windows tool is going to read it.
  4. Save. The file is written by your browser; it never travels.

Do it in the editor

What usually goes wrong

  • Commas inside cells

    A product name like "Mug, ceramic" is one cell in a TSV and two in a naive CSV. The export quotes it instead, and doubles any quote character already inside.

  • Excel and the byte order mark

    Excel reads a UTF-8 CSV as Latin-1 unless the file starts with a byte order mark, which is how accented characters become mojibake. If Excel is the destination, leave the mark on.

  • The trailing newline

    Some parsers treat a final empty line as an extra empty row. The export keeps whatever the original had, and lets you change it deliberately.

Semicolon- and pipe-separated input can be detected, but CSV output always uses commas. The export dialog declares this delimiter conversion. TSV downloads use UTF-8 and tabs; CSV downloads use UTF-8 and commas. Review the effective record line endings, BOM and final line break in the export dialog. Quotes are rebuilt, and mixed record endings become uniform. Unsafe output is blocked; explicit quoting conversion is offered when it preserves the table, and ambiguous input requires confirmation.