Convert XLSX to CSV Online
Convert Excel to CSV online. The tool is free, the conversion runs on the server in an isolated request. Batch conversion is supported, server uploads are capped at 100 MB per file, and no account is required. Keep the original file while you review the converted copy.
Convert .XLSX to .CSV
Select a file to begin. Processing details and limits are listed below.
How to convert XLSX to CSV
- 1
Upload Excel files
Add one or more Excel files to the queue. The uploader keeps batch items separate.
- 2
Choose CSV settings
Set the available quality or format options, or keep the defaults for a first pass.
- 3
Run and save the result
Run the queue and download the CSV files individually or together as a ZIP.
Microsoft Excel Spreadsheet vs Comma-separated values
| Spec | Microsoft Excel Spreadsheet | Comma-separated values |
|---|---|---|
| MIME type | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet | text/csv |
| Format type | data | data |
| Standard | Pending review | RFC 4180 |
| First release | Pending review | 2005 (RFC 4180); earlier usage predates the RFC |
| Browser support | Pending review | Text display and browser spreadsheet apps |
| Contents | Structured spreadsheet with formulas. | Plain-text rows and columns separated by a delimiter, usually commas, with optional quoting and a header row. |
About Microsoft Excel Spreadsheet
Structured spreadsheet with formulas.
About Comma-separated values
Simple, human-readable, small, and supported by virtually every spreadsheet and database tool. No standard type system, delimiter and quoting conventions vary, and nested or hierarchical data does not fit naturally.
Format referenceWhy convert XLSX to CSV?
- The target format can improve compatibility with an office suite, reader, or client that rejects the source.
- The destination format may support comments, fixed layout, or print output more directly.
- The result can be checked in the app where it will actually be used.
- CSV may be easier to edit, share, print, or archive than the source Excel document.
Will quality change?
The data is mapped into CSV syntax. Values may change representation because the source and destination have different type systems. Check a sample before processing a large batch.
Processing and limits
- Processing
- Server-side
- Engine
- LibreOffice and document tooling
- Maximum size
- 100 MB per file on the server.
- Batch support
- Yes, multiple files can be queued; completed results can be downloaded as a ZIP.
- Quality controls
- No quality slider. The output follows the fixed conversion path.
The file is processed on the server because the conversion requires a server-side engine or a utility operation.
- No standard type system, delimiter and quoting conventions vary, and nested or hierarchical data does not fit naturally.
- Check metadata, dimensions, and compatibility after the conversion.
- Very large files can hit the 100 MB server limit before conversion starts.
Platform compatibility
CSV is a broadly supported target, including text display and browser spreadsheet apps. The source is Excel, which may have narrower support.
When not to convert
- Avoid repeated lossy conversions when quality matters; start from the highest-quality source available.
- If the file contains sensitive data, review the processing model before uploading it to a server.
- Do not convert when the original Excel must remain the only editable or archival copy.
Frequently asked questions
- How do I convert Excel to CSV online?
- Upload a Excel file, choose the available CSV options, run the conversion, and download the result. The tool is free, supports batches, and accepts server uploads up to 100 MB.
- Is Convert XLSX to CSV free?
- It is free, requires no account, and adds no watermark. Server uploads are limited to 100 MB per file, and browser-first paths are limited by device memory.
- Does Excel to CSV conversion lose quality?
- The data is mapped into CSV syntax. Values may change representation because the source and destination have different type systems. Check a sample before processing a large batch.
- Is my Excel file uploaded?
- Yes. This conversion uses a server-side engine, so the file is uploaded over HTTPS, processed in an isolated request, and removed after the result is produced.
- Is batch conversion supported?
- Queue multiple files, run them together, and download the finished results as a ZIP. Each server file is limited to 100 MB, and large batches may take longer.
- What are the limitations?
- Open the downloaded CSV file in the application or database you plan to use, check the structure against the source, and keep the original until the output is approved.