How to convert XLSX to CSV
Converting XLSX to CSV takes three quick steps:
- Add one or more XLSX files — drag and drop them or click to browse.
- Click Convert to CSV and let the conversion run in your browser.
- Download your new CSV files individually or as a batch.
What is XLSX?
XLSX is the modern Microsoft Excel spreadsheet format. It stores multiple sheets, formulas, formatting and charts in a compressed XML package, and is the standard for sharing rich spreadsheets that go beyond plain CSV.
What is CSV?
CSV is the simplest way to store tabular data: each line is a row and commas separate the columns. It is plain text, opens in Excel, Google Sheets and any programming language, and is the universal format for exporting and importing spreadsheets and databases.
XLSX vs CSV: how they compare
Both formats have their place. This table summarises the practical differences so you can pick the right one for the job.
| XLSX | CSV | |
|---|---|---|
| Format type | Data | Data |
| Compression | Zipped XML | None |
| Quality | Lossless | Lossless |
| Best for | Rich spreadsheets with formulas | Spreadsheet exports and imports |
Why convert XLSX to CSV?
Converting XLSX to CSV gives you a file that is better suited to spreadsheet exports and imports and moving data between apps, and that opens it up to far more apps, devices and websites.
What CSV gives you: opens in every spreadsheet and language, tiny and human-readable and easy to generate.
Where XLSX falls short: needs spreadsheet software, heavier than CSV and harder to parse programmatically than CSV. Converting keeps your content while moving to a format that matches where the file is going.
Tips for the best results
- CSV is lossless, so your converted files keep every detail of the original XLSX.
- You can convert several files in one go — add as many XLSX files as you like and download them together.
- Everything runs locally in your browser, so even large files convert quickly and nothing is uploaded.
XLSX to CSV — frequently asked questions
- How do I convert XLSX to CSV?
- Add your XLSX file, click Convert to CSV, and download the CSV result. The whole process happens in your browser and takes just a few seconds.
- Is it free to convert XLSX to CSV?
- Yes. This XLSX to CSV converter is completely free with no sign-up, no watermarks and no limit on the number of files you can convert.
- Are my XLSX files uploaded to a server?
- No. Conversion runs entirely on your device using your browser, so your files never leave your computer or phone.
- Does converting XLSX to CSV reduce quality?
- No. CSV is a lossless format, so the conversion preserves the full quality of your original XLSX.
- Can I convert multiple XLSX files at once?
- Yes. Add as many XLSX files as you like and convert them in a single batch, then download each CSV result.