How to use Excel to CSV / CSV to Excel Tool

This tool provides simple and fast Excel to CSV, CSV to Excel, and XLSX to CSV conversion services, without installing any software. All conversions are completed within the browser, ideal for importing data into databases, organizing financial reports, or migrating data.

Upload Files

Drag and drop your .xlsx, .xls, or .csv files into the box above. Supports uploading multiple files at once.

Check Preview

The tool automatically parses the first file and displays the first 10 rows. Ensure the encoding is correct.

One-click Convert

Click the convert button, and all files will be automatically converted to the target format and downloaded.

Features

Bidirectional: Full support for Excel to CSV, CSV to Excel, XLSX to CSV, and CSV to XLSX.
Encoding Support: To resolve garbled text issues in CSV files, we support UTF-8 BOM and GBK encodings for Microsoft Excel compatibility.
Privacy First: Powered by WebAssembly (SheetJS), all processing happens locally in your browser. No data is uploaded to any server.
Batch Processing: Highly efficient conversion whether it's one file or fifty files at once.

FAQs

Why is the CSV file garbled after Excel to CSV conversion?

Microsoft Excel defaults to requiring a BOM (Byte Order Mark) for UTF-8 CSV files. During conversion, please select the "UTF-8 with BOM" option to ensure Chinese characters display correctly in Excel.

Does it support .msg or .numbers formats?

Currently, we support standard .xlsx (Excel 2007+), .xls (Excel 97-2003), and .csv text files. For Apple Numbers files, please export them as Excel format first before using this tool.

Is there a file size limit?

Since processing happens locally, our optimized algorithm typically supports files up to 50MB. Very large files might cause the browser to slow down; we recommend splitting them if possible.

Will formulas be lost after conversion?

Yes. CSV (Comma Separated Values) is a plain text format that only stores data. It does not contain formulas, formatting, or styling. Only the calculated values will be preserved.

What if date formats change after conversion?

Excel stores dates as numbers internally. This tool attempts to restore their displayed format, but if you see numbers like 43101, those are raw timestamps. We suggest setting Excel cells to Text format before conversion.

What is GBK encoding?

GBK is a character encoding used primarily for Simplified Chinese environments. Many older systems export CSV files in GBK. If you see garbled text, selecting GBK encoding should resolve it.

Is this tool completely free?

Yes, this tool is entirely free, no limits on usage, and no registration required.

Is there a row limit for CSV to Excel?

Excel 2007 and later versions (.xlsx) support up to 1,048,576 rows per sheet. If your CSV exceeds this, Excel will not be able to display all data. We recommend using our "CSV Splitter" first.

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Excel to CSV / CSV to Excel Online Tool

Files to Process ()

Data Preview (First 10 lines of first file)