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    Convertly Converter

    Convert CSV to XLSX online

    Convert your CSV files to XLSX for free, online, no signup or installation.

    Accepted source formats

    CSV

    Available output formats

    XLSX

    How it works

    1

    Upload

    Drag and drop or select your CSV file from your device

    2

    Convert

    Click "Convert" and wait a few seconds

    3

    Download

    Get your converted XLSX file instantly

    Common mistakes

    • Using a source file of poor quality.
    • Publishing without checking the final result.
    • Confusing file size, dimensions and quality.
    • Overwriting the original file without keeping a copy.

    Pro tips

    • Always keep an original version.
    • Test several settings before downloading.
    • Use WebP for the web when possible.
    • Choose descriptive file names for SEO.

    Privacy guaranteed

    Your files are processed locally in your browser and are never uploaded to our servers.

    Turn raw data into a table you can work with in Excel

    A CSV file opens in Excel but remains plain tabulated text, without the features of a real workbook. Converting to XLSX creates a full spreadsheet file, in which columns, formulas, and formatting can then be added normally.

    Avoid separator and encoding problems

    Opening a CSV directly in Excel can split columns incorrectly depending on the separator originally used (comma or semicolon, depending on regional settings) or display accented characters incorrectly. The conversion handles this interpretation upfront, for a correctly structured result right from opening.

    A starting point for enriching the data afterward

    Once in XLSX, the file can receive formulas, conditional formatting, charts, or several sheets — features a CSV file simply can’t contain by nature.

    Discover all our tools

    Convert, compress, merge and edit your files in a few clicks.

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    Complementary tools

    PDF → PNGJPG → PDFMP4 → PDFMP3 → WAV

    Guides and tutorials

    Learn how to use our tools with our detailed guides.

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    Frequently asked questions

    To avoid column-splitting or character-encoding errors that can occur on direct opening.

    Yes, the resulting XLSX is a real Excel workbook, with all its features.

    Yes, the CSV file’s encoding is interpreted correctly during conversion.

    No, a single sheet is created, matching the source CSV file’s content.
    Convert CSV to XLSX for free | Convertly Converter