CSV Helper

Free tools that fix CSV and Excel file problems right in your browser

🔒 Files are processed only inside your browser and are never sent to a server.

• CSV CheckerFinds broken characters, column mismatches and quote errors, with line numbers.
• CSV ↔ JSON ConverterConvert CSV to JSON and JSON to CSV. Reads Korean Excel CSV files too.
• Remove Duplicate RowsKeeps the first of rows that match on the columns you choose.
• Encoding Converter (CP949 ↔ UTF-8)Convert Korean Excel CSV (CP949) and UTF-8 files both ways.
• JSON Formatter & ValidatorPretty-prints JSON and points to errors by line and column.
• Character & Byte CounterCounts characters with and without spaces, plus UTF-8 and CP949 bytes.