What is this CSV format converter?
A free, browser-based tool to re-emit a CSV with a different delimiter (comma, tab, semicolon, pipe), quoting style, line ending (LF/CRLF), and — most importantly — encoding. The number one CSV headache in Japan is mojibake: open a UTF-8 CSV in Japanese Excel and the text turns into garbage. This tool fixes it by exporting as Shift_JIS or UTF-8 with BOM, the encodings Excel reads correctly. Everything runs locally in your browser, so your data is never uploaded.
How to use it
- Upload a CSV file or paste it into the box on the left.
- Choose the input and output delimiter, quoting style, and line ending.
- Pick the encoding — use Shift_JIS or UTF-8 with BOM to avoid mojibake in Japanese Excel.
- Download the converted CSV.
Common use cases
- Fixing garbled (mojibake) CSV exports so they open cleanly in Japanese Excel.
- Converting a comma CSV to tab-separated (TSV) for another tool.
- Switching line endings between Windows (CRLF) and Unix (LF) for a strict importer.