Convert TSV to CSV

TSV to CSV Converter — frequently asked questions

How do I convert TSV to CSV?

Paste your TSV, or open or drop a file, and the CSV appears instantly. Copy it, download it (named after your file), or open it in another tool. Errors point to the line and column. Everything happens in your browser.

What if my TSV is nested?

Nested objects become dotted columns like address.city, or, if you choose, JSON text in one cell; lists are written as JSON text or numbered columns. Records with different keys still get every column, and cells starting with = + - or @ get an apostrophe so a spreadsheet won't run them as formulas (you can turn that off).

Does it use the first row as headers, and keep my zip codes?

Yes. The first row is the column names. Each column gets one type: numbers only when every value is a plain number, so zip codes and ids like 01234 stay text with their leading zeros. Tick "Keep values as text" to read everything as text. A file with one column works, and short rows are padded and listed by line number.

Is my data uploaded to a server?

No. The conversion runs entirely in your browser — your data never leaves your device, so it's safe to convert configuration, API payloads, and other sensitive files. You can even go offline once the page has loaded.

Is this converter really free?

Yes. No sign-up, no payment details, no file-size paywall, and no watermark on the output.