Excel to CSV Converter
Convert Excel files (.xlsx/.xls) to CSV or TSV. Choose sheets, encoding, and line endings.
Drag & drop Excel files
or
Supported formats: Excel (.xlsx / .xls) files supported
What Is Excel to CSV Conversion?
Excel to CSV conversion is an online tool that converts Excel files (.xlsx/.xls) to CSV format. It's useful for database imports, system integrations, and sharing data in a lightweight text format whenever CSV is required.
sakutto.ai's Excel to CSV converter processes everything in your browser — your files are never sent to any server. You can safely convert Excel files containing business data and personal information.
Supports character encoding selection (UTF-8/Shift_JIS) for compatibility with different systems. Great for extracting data from macro-enabled Excel files or batch-converting large datasets. Free, no sign-up required.
How to Use the Excel to CSV Converter
- Drag and drop an Excel file (.xlsx/.xls), or use the file picker to load it
- If the file has multiple sheets, select the one you want to convert
- Adjust the output settings (delimiter, encoding, line ending)
- Click the "Convert to CSV" button
- Download the converted CSV or TSV file
Features
- Sheet selection
- Choose which sheet to convert from multi-sheet Excel files
- Encoding options
- Choose from UTF-8 (with or without BOM) or Shift_JIS to match your needs
- TSV output support
- Switch the delimiter to tab to export in TSV format
- Line ending selection
- Choose between Windows (CRLF) and Mac/Linux (LF) line endings
- Batch conversion
- Convert multiple Excel files to CSV at once
- 100% browser-based
- Files are never sent to a server — your privacy is protected
Why Excel to CSV Converter on sakutto is safe
Many online tools upload your files to external servers for processing. This tool never sends your Excel files to any server — everything is processed entirely in your browser.
* Some AI-powered tools require server-side processing. Tools that send data to a server will always notify you beforehand.
| Comparison | Typical online tools | sakutto |
|---|---|---|
| Where data is sent | Uploaded to external servers | Nowhere — processed in your browser |
| Data leak risk | Risk during transfer and server storage | No risk — no network transfer occurs |
| External traffic | File data travels over the internet | No file data appears in network logs |
| Offline use | Not possible (server required) | Works offline after initial load |
How browser-based processing works
- WebAssembly (WASM): Processes Excel files in your browser at near-native speed. No server communication occurs.
- Web Workers: Runs on a background thread separate from the main thread, so your browser stays responsive during processing.
- After processing, your browser automatically frees the data from memory. No Excel files remains outside your device.
For IT security teams: How to verify
You can verify that sakutto never sends your Excel files externally by checking the Network tab in your browser's DevTools while using the tool. You'll see that no requests involving your Excel files are made. This can also serve as documentation for your IT security team.
Frequently Asked Questions
Will converting Excel to CSV cause garbled characters?
You can choose the encoding, so selecting the right one prevents garbled text. For opening in Excel on Windows, we recommend UTF-8 with BOM or Shift_JIS.
Does it support multi-sheet Excel files?
Yes. When an Excel file contains multiple sheets, you can select which sheet to convert. You can even choose different sheets for different files.
Can I export in TSV format?
Yes. Simply switch the delimiter to "Tab (TSV)" in the output settings to export a tab-separated TSV file.
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