Excel shows mojibake
Input
meibo.csv (Shift_JIS)
Output
Detected: Shift_JIS → download UTF-8 (BOM)
CSV Mojibake Repair (Encoding Checker)
Open a garbled CSV, see which encoding it really uses, and download an Excel-safe UTF-8 copy without the file ever leaving your browser.
Conversion tools
Your text and CSV content are processed in your browser, without being sent to a server. Processing and analytics
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What it helps with
- Fix a CSV that opens as mojibake in Excel
- Check whether a CSV is Shift_JIS or UTF-8 before importing
- Convert legacy Shift_JIS exports to UTF-8 safely
How to use
- Choose or drop the CSV file that shows garbled characters.
- Check the detected encoding and the decoded preview rows.
- Download the UTF-8 (with BOM) copy and open it in Excel.
Examples
UTF-8 CSV for Excel
Input
export.csv (UTF-8 without BOM)
Output
Detected: UTF-8 → download UTF-8 (BOM)
Good to know
- Export is UTF-8 with BOM only; saving as Shift_JIS is not supported yet.
- Encoding detection is heuristic and can be uncertain for very short or heavily damaged files.
- Files over 8 MB are rejected to keep the browser responsive.
FAQ
- Why does my CSV look garbled in Excel?
- Excel on Japanese Windows assumes Shift_JIS for CSV files without a BOM, so UTF-8 files without a BOM often show mojibake. A UTF-8 file with a BOM opens correctly.
- Is the file uploaded anywhere?
- No. The file is read with your browser's file reader and processed on this page only.
- Can it save the file back as Shift_JIS?
- Not yet. Export is UTF-8 with BOM, which modern Excel and most systems accept.