Why convert this way?
Spreadsheet tools don't always agree on format — older files come as .xls, LibreOffice exports .ods, and most data pipelines only accept plain .csv. Converting between them shouldn't cost you your formulas or formatting.
How Fyleon does it
Fyleon parses the spreadsheet's cell data, formulas, and styling in-browser and rewrites it in the target format, keeping your file off any server for files under 400MB. For files under 400MB, nothing is uploaded anywhere; the file never leaves your computer. Larger files route through Fyleon's dedicated cloud pipeline, billed against your plan's own monthly quota before any one-time charge applies.
Step-by-step
- Open the Convert Spreadsheet tool and sign in (or create a free account — it takes a few seconds).
- Drop your XLS, XLSX, ODS, or CSV file onto the upload area, or click to browse for it.
- Choose your target format.
- Download the converted file directly to your device.
A note on this conversion
Converting to CSV flattens the file to plain data — formulas, multiple sheets, and formatting don't survive that specific conversion, since CSV itself has no concept of them.
Files processed locally never touch Fyleon's servers, so a file with sensitive or confidential content never leaves your device.