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Convert XLSX to CSV Online

Swap Formats

Convert XLSX files to CSV instantly in your browser. Free, fast, and 100% private - your files never leave your device. No account or software required. Supports batch conversion and custom settings.

Choose XLSX files or drag & drop

Multiple files supported · No file size limit

100% PrivateNo UploadFree

How to Convert XLSX to CSV - 3 Simple Steps

1

Upload Your XLSX File

Drag and drop your XLSX file into the upload area above, or click to browse your device. You can upload multiple files at once for batch conversion.

2

Adjust Settings

Set your preferred quality, resize dimensions, or other format-specific options. The default settings are optimized for the best CSV output.

3

Download CSV File

Click Convert and your CSV file is ready instantly. Download individual files or click "Download All as ZIP" for batch results.

XLSX vs CSV — Format Comparison

FeatureXLSXCSV
File SizeSmall to mediumSmall
CompressionLosslessLossless
Transparency (Alpha)✗ Not supported✗ Not supported
Animation✗ Not supported✗ Not supported
Vector-based✗ No (raster)✗ No (raster)
Browser SupportN/A (requires Excel or compatible app)All major browsers (via download)
Best ForSpreadsheets, financial data, data analysisSpreadsheet data, database exports, data science

Also Convert XLSX to:

XLSX → JSONXLSX → PDF

Convert Other Formats to CSV:

JSON → CSV

Why Use ConvertTheFile for XLSX to CSV?

🔒

100% Private

Files are converted in your browser and never uploaded to any server.

⚡

Instant Conversion

No waiting for uploads or server processing. Results are instant.

🆓

Completely Free

No limits, no watermarks, no account required - forever free.

📦

Batch Conversion

Convert multiple files at once and download them as a ZIP archive.

Frequently Asked Questions — XLSX to CSV Converter

How do I convert XLSX to CSV online?
Upload your XLSX file by dragging it into the upload area or clicking to browse your files. click Convert. Your CSV file will be ready to download in seconds — no account or software required.
Is it safe to convert XLSX files to CSV online?
Completely safe. This converter runs entirely in your browser. Your XLSX files are never uploaded to any server — conversion happens locally on your device using browser APIs. Files are not stored or shared.
What is the difference between XLSX and CSV?
XLSX is best for: Spreadsheets, financial data, data analysis. CSV is best for: Spreadsheet data, database exports, data science.
Is this XLSX to CSV converter free?
Yes, completely free with no limits. There is no registration, no watermarks, no file size limit beyond what your browser can handle, and no hidden charges.
Can I batch convert multiple XLSX files to CSV?
Yes. Upload multiple XLSX files at once — each is converted separately and you can download all results as a ZIP archive.
How long does XLSX to CSV conversion take?
Document conversion usually takes 1–5 seconds depending on file size and complexity. PDFs with many pages or complex layouts may take longer.

About XLSX (Microsoft Excel Spreadsheet)

XLSX is Microsoft Excel's modern format supporting formulas, charts, multiple sheets, and rich cell formatting.

Learn more about XLSX →

About CSV (Comma-Separated Values)

CSV is a plain text format for tabular data, using commas to separate values. Universally supported by spreadsheet and database applications.

Learn more about CSV →