About converting XLSX to CSV
Convert XLSX to CSV online for free - the conversion happens locally in this tab, so your file never gets uploaded to a server. XLSX is Excel's zipped-XML workbook format, carrying multiple sheets, live formulas, cell types and formatting that a flat text export cannot represent. CSV is the lowest-common-denominator tabular format - one row per line, fields split by commas - which every spreadsheet, database and analytics tool on earth can import.
Converting XLSX to CSV is everyday plumbing work: an export from one system arrives in the wrong shape for the API, script or spreadsheet that has to consume it next.
Because every conversion runs on your own device through WebAssembly builds of the same open-source engines desktop tools use, there is no upload queue, no file-size cap imposed by a server, and no copy of your XLSX sitting in someone else's storage afterwards. That matters most for anything you would hesitate to hand to a third party - identity documents, contracts, medical scans, unreleased work, client material. It also means the converter keeps working with no network connection at all once the page has loaded.
XLSX to CSV is one of many routes available here. If a direct path between two formats does not exist, the converter automatically chains several conversions together to reach the one you asked for, so you can get from almost any input to almost any output in a single step.
How to convert XLSX to CSV
- Drop your XLSX file onto the area above, or click it to browse for one.
- Confirm that "Convert from:" reads XLSX - it is detected from your file automatically.
- Check that "Convert to:" is set to CSV. It is already pre-selected on this page.
- Press Convert, then save the converted data file when it is ready.
Frequently asked questions
- Is this XLSX to CSV converter free?
- Yes, completely. There is no charge, no account, no watermark on the output and no daily conversion limit.
- Are my files uploaded to a server?
- No. The conversion runs in your browser using WebAssembly, so your XLSX file never leaves your device and nothing is stored anywhere after you close the tab.
- Is there a file size limit for XLSX to CSV conversion?
- There is no server-imposed limit, because there is no server involved. The practical ceiling is your own device's available memory, so very large files convert faster on a desktop than on a phone.
- Will the CSV output look the same as the XLSX original?
- CSV output preserves the content of your XLSX file. Formatting fidelity depends on how closely the two formats can represent the same structures - features one format supports and the other has no equivalent for cannot be carried across.
NEXINVATE