Why Convert XLSX to CSV?

XLSX is a proprietary Excel format that contains formulas, formatting, charts, and multiple sheets. CSV, on the other hand, is a plain-text format that stores tabular data (numbers and text) in lines separated by commas. Converting to CSV makes your data:

  • Universally compatible – Almost every database system, programming language, and statistical tool can read CSV files.
  • Lightweight – CSV files are much smaller than XLSX files, saving storage and bandwidth.
  • Easy to process – No complex parsing required; you can open CSVs in simple text editors.
  • Free from formatting & macros – Ideal when you need raw, clean data without hidden formulas.

However, conversion can be tricky if your XLSX contains multiple sheets, special characters, or date/time formats. We'll cover those pitfalls too.

Method 1: Convert XLSX to CSV Using axztools.com (Free Online Converter)

The quickest and most reliable way is to use our dedicated XLSX to CSV converter at axztools.com. Here's how:

  1. Visit axztools.com/XLSX-to-CSV – No registration or payment required.
  2. Upload your XLSX file – Drag and drop or click to browse. Supports files up to 50MB.
  3. Choose your delimiter – Default is comma, but you can select semicolon, tab, or pipe if needed.
  4. Select sheet(s) – If your XLSX has multiple sheets, you can convert all at once (each becomes a separate CSV) or choose specific sheets.
  5. Handle encoding – For international characters (e.g., accented letters, Chinese), select UTF-8 encoding.
  6. Click 'Convert' – The conversion happens server-side in seconds (no upload to third parties, privacy assured).
  7. Download your CSV(s) – A ZIP file will be provided if you converted multiple sheets.

Pro tip: If your original XLSX has cells with line breaks, the converter automatically wraps them in double-quotes to comply with CSV standards (RFC 4180). You can also trim extra whitespace within the tool.

Method 2: Convert Using Microsoft Excel (Desktop)

If you prefer using Excel itself, the "Save As" feature works for simple conversions, but there are limitations:

  1. Open your XLSX file in Excel.
  2. Go to File > Save As (or Export in newer versions).
  3. Choose CSV UTF-8 (Comma delimited) (*.csv) if available, or CSV (Comma delimited) (*.csv) for older Excel.
  4. If prompted about losing features (like multiple sheets), click OK – Excel only saves the active sheet as a CSV.
  5. Rename and save.

    6. Important: Excel often messes up dates (e.g., "1/2/2024" might become "44231") and may strip leading zeros from IDs. To avoid this, format your cells as Text before saving to CSV.

    Method 3: Use Google Sheets (Free & No Software Install)

    Another great online option is Google Sheets. It handles multi-sheet exports neatly:

    1. Upload your XLSX file to Google Drive.
    2. Open it with Google Sheets (right-click > Open with > Google Sheets).
    3. For each sheet you want to convert, click the sheet tab, then go to File > Download > Comma-separated values (.csv, current sheet).
    4. Repeat for each sheet.

    Downside: Google Sheets may have issues with very large files (over 10MB) and certain advanced Excel features.

    Common Challenges & Solutions

    ChallengeSolution
    Multiple sheets become separate CSVsUse axztools.com's batch conversion or manually export each sheet.
    Dates displayed as numbers in CSVIn Excel, format date cells as Text (YYYY-MM-DD) before saving.
    Leading zeros lost (e.g., zip codes 00123 → 123)Format column as Text in Excel before conversion, or use a converter that preserves them.
    Special characters (€, ü, 中文) garbledAlways choose UTF-8 encoding when saving CSV.
    Commas inside cells break columnsProper CSV tools (like ours) wrap such fields in quotes. Avoid manual splitting.
    File size too large for online toolsSplit the XLSX into smaller parts, or use desktop software like LibreOffice.

    Manual Conversion: When You Need Total Control

    If you prefer a text-editor approach, you can export a CSV via Excel/Google Sheets and then edit the raw CSV using Notepad++ or VS Code. Not recommended for beginners, but useful if you need to adjust delimiters, fix encoding, or sanitize data.

    Conclusion

    Converting XLSX to CSV doesn't have to be a headache. For most users, the best path is a dedicated online converter like the one at axztools.com — it's fast, secure, handles multiple sheets, and preserves data fidelity without manual tweaking. Whether you're a beginner or a power user, follow the methods above and you'll have clean, ready-to-use CSV files in minutes.

    Ready to convert? Try our free XLSX to CSV converter now →