Convert XLSX to CSV Online Free

Drag & drop your .xlsx file here, or click to browse

Converts to CSV in your browser · first daily conversion free · no signup

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How to convert Excel to CSV: Drop your XLSX spreadsheet and get a CSV file back instantly. No Microsoft Excel needed. No upload, no signup. ChangeThisFile offers 593+ free file conversions.

By ChangeThisFile Team · Last updated: March 2026

Quick Answer

To convert Excel to CSV, drop your XLSX file into the converter above. ChangeThisFile processes the spreadsheet in your browser using SheetJS and extracts the data as a clean CSV file. The conversion is instant and your file never leaves your device. Free, no signup required, no Excel needed. ChangeThisFile supports 593+ conversion routes with privacy-first processing.

First daily conversion free No signup required Files stay on your device Instant conversion Updated May 2026

XLSX vs CSV: Format Comparison

Key differences between the two formats

Feature	XLSX	CSV
File structure	Binary ZIP archive with XML inside	Plain text with comma-separated values
Multiple sheets	Supported	Single table only
Formulas	Supported with cell references	Not supported (values only)
Formatting	Fonts, colors, borders, cell styles	None (plain text)
File size	Larger due to formatting metadata	Minimal, just raw data
Compatibility	Requires Excel or compatible app	Opens in any text editor or spreadsheet app
Charts and images	Embedded in workbook	Not supported

When to Convert

Common scenarios where this conversion is useful

Data import into databases

Most databases (MySQL, PostgreSQL, SQLite) support CSV import directly. Convert your Excel data to CSV for bulk database loading.

Data analysis with Python or R

CSV is the standard input format for pandas, R, and other data science tools. Convert Excel reports to CSV for scripting and analysis.

Sharing data without Excel dependency

Not everyone has Microsoft Excel. CSV files can be opened by any spreadsheet application, text editor, or programming language.

Version control for data files

XLSX files are binary and produce unusable diffs in Git. Convert to CSV for meaningful line-by-line version control of your data.

Who Uses This Conversion

Tailored guidance for different workflows

Developers

Convert XLSX config files to CSV for compatibility with different tools or frameworks
Transform XLSX API responses to CSV for debugging, logging, or documentation

Validate the converted CSV output with a linter to catch any structural issues from the conversion

Watch for data type coercion (e.g., numbers becoming strings) when converting between XLSX and CSV

Data Analysts

Convert XLSX exports to CSV for importing into spreadsheet software, databases, or BI tools
Transform XLSX datasets to CSV for sharing with teammates who use different analysis tools

Check that column delimiters and quote escaping are handled correctly in the converted CSV file

Preview the first few rows of the CSV output to verify headers and data alignment

System Administrators

Convert XLSX configuration to CSV when migrating between infrastructure tools or platforms
Transform XLSX log exports to CSV for ingesting into monitoring or analysis systems

Back up the original XLSX config before converting, especially for production systems

Test the converted CSV in a staging environment before deploying to production

How to Convert XLSX to CSV

1

Upload your Excel file

Drag and drop your .xlsx file onto the converter, or click to browse. Files with multiple sheets are supported (first sheet is converted).
2

Automatic conversion

Your spreadsheet is parsed in the browser. Formulas are resolved to their computed values. Formatting is stripped, leaving only the raw data.
3

Download the CSV result

Click Download to save your CSV file. Values are comma-separated with proper quoting for fields that contain commas or newlines.

Automate this conversion

Convert XLSX to CSV via API

Integrate this conversion into your pipeline with 3 lines of code. Free tier: 25 conversions/month.

The free converter above runs entirely in your browser — your file is never uploaded. This optional API is a separate server-side endpoint for automating conversions at scale.

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@input.xlsx" \
  -F "target=csv" \
  -o output.csv --fail

const form = new FormData();
form.append('file', fileInput.files[0]);
form.append('target', 'csv');

const res = await fetch('https://changethisfile.com/v1/convert', {
  method: 'POST',
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' },
  body: form
});
const blob = await res.blob(); // your converted CSV file

Replace YOUR_API_KEY with your free key — no credit card needed.

Get a free API key

Frequently Asked Questions

Which sheet is converted?

The first (leftmost) sheet in your workbook is converted to CSV. If you need a different sheet, rearrange the sheet order in Excel before converting.

Are formulas preserved?

Formulas are resolved to their last computed values. The CSV output contains the calculated results, not the formula expressions themselves.

How are dates handled?

Excel dates are converted to their text representation. Date formatting follows the format applied in the spreadsheet (e.g., MM/DD/YYYY or YYYY-MM-DD).

What about merged cells?

Merged cells are unmerged during conversion. The value appears in the top-left cell of the original merge range, and the remaining cells are empty.

Does it handle large files?

Yes. The conversion runs in your browser, so it can handle files with hundreds of thousands of rows depending on your device's memory. Files up to 100MB work well on modern computers.

Are special characters preserved?

Yes. Fields containing commas, quotes, or newlines are automatically wrapped in double quotes following RFC 4180 CSV standards.

Do I need Microsoft Excel installed?

No. The converter uses SheetJS to parse Excel files directly in the browser. No Excel or Office installation is required.

Can I convert password-protected files?

No. Password-protected or encrypted Excel files cannot be read by the browser-based parser. Remove the password protection in Excel first.

What encoding does the CSV output use?

The output uses UTF-8 encoding, which supports all international characters, emojis, and special symbols.

Is my spreadsheet data safe?

Yes. Your file is processed entirely in your browser. No data is sent to any server. This makes it safe for confidential financial data, customer lists, or any sensitive information.

Is it safe to convert my files here?

Yes — XLSX to CSV conversion happens entirely in your browser using JavaScript. Your files are never uploaded to any server.

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