Open .csv files online
You can open .csv files as a sheet in your browser with the spreadsheet editor, then save them back out as CSV or XLSX. Nothing is uploaded. We have not published an open test for specific CSV files yet.
Best on a desktop browser. This editor has desktop menus and shortcuts.
Can I open it?
tested 2026-10-12 · engine 0.5.0 · chromium 152 desktop · local server
| Check | Result | Notes |
|---|---|---|
| Listed by the engine | Listed in docs | CSV and TSV read and write. |
| Opened a .csv file in our test | Not tested yet | We have not published an open test for this format yet. |
| Editor starts | Works | Loaded without problems |
FAQ
Can it open a large CSV?
Large files depend on your device memory and may be slow. We have not tested file size limits yet.
Can I save as XLSX?
XLSX is the editor's native format, so yes.
Is my file uploaded?
No. It is read by code running in your browser.