How to use and verify
Choose an original CSV file and select the encoding that displays its text correctly. Available choices are UTF-8, EUC-KR, UTF-16 LE and UTF-16 BE. Encoding detection is ambiguous, so the tool asks you to choose. Invalid byte sequences block export. Characters already replaced with question marks cannot be recovered from that damaged copy; return to the original source file.
Choose comma, semicolon or tab as the delimiter. The preview displays only the first 100 rows and 30 columns, while export includes every row. Quoted separators, embedded line breaks, empty cells and escaped quotes are parsed as text. Export uses UTF-8 BOM, CRLF line endings and quoted cells. Numeric conversion is never applied.
For example, 00123 stays 00123 inside the file. A spreadsheet can still interpret it as a number when opened directly. Import the CSV and set that column to Text. A BOM identifies encoding; it does not define spreadsheet cell types. This tool does not add formulas or tabs to force formatting.
Files are limited to 10 MiB. Check names, phone numbers, blank cells and delimiters before saving. Untrusted cells starting with =, +, - or @ may become formulas in spreadsheet software. Import them as text; this tool intentionally preserves their contents.
2026 example: "00123","Seoul" → "00123","Seoul"
FAQ
How do I use this tool?
Choose an original CSV file and select the encoding that displays its text correctly. Available choices are UTF-8, EUC-KR, UTF-16 LE and UTF-16 BE. Encoding detection is ambiguous, so the tool asks you to choose. Invalid byte sequences block export. Characters already replaced with question marks cannot be recovered from that damaged copy; return to the original source file.
Are files or names uploaded?
No. Processing happens in browser memory without sending inputs to a server or external API. Close the tab after using a shared device.
What should I check at the end?
Files are limited to 10 MiB. Check names, phone numbers, blank cells and delimiters before saving. Untrusted cells starting with =, +, - or @ may become formulas in spreadsheet software. Import them as text; this tool intentionally preserves their contents.