Excel to CSV

Flatten the spreadsheet.

Excel to clean CSV. Instantly.

.xlsx .xls · tap to browse

or

No upload
Works offline
No tracking

Need to convert large Excel files? The offline bundle handles unlimited files with no limits. $49 once.

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// How it works

Three steps. Zero uploads.

01
Drop
Drop an Excel file (.xlsx or .xls). It stays on your device.
02
Preview
See your data in a table. Switch between sheets if multiple exist.
03
Download
Download each sheet as CSV. Nothing was ever uploaded.
// Why this is different

Your data never leaves your machine.

Most online converters upload your Excel file to a server. Your spreadsheet passes through systems you don't control.

fwip works differently. The conversion engine runs entirely in your browser. Your data is read from your device, processed on your CPU, and the result is saved back to your device. No server is involved. We literally cannot see your file.

No server processing

Everything runs on your device using WebAssembly. Your file never touches a network.

No account required

Drop a file. Get a result. No sign-up, no email, no password.

No subscription

Free in the browser. $99 once for the offline bundle. That's it. Forever.

Works offline

The desktop version works with no internet connection at all.

// Questions

Frequently asked.

Does this handle multiple sheets?▾
Yes. fwip reads all sheets in the workbook and lets you preview and download each one individually as a separate CSV.
What about formulas?▾
Formulas are resolved to their calculated values. The CSV contains the result, not the formula itself.
Are merged cells supported?▾
Merged cells are expanded. The value appears in the first cell of the merged range, and other cells are empty.
What Excel formats are supported?▾
Both .xlsx (modern Excel) and .xls (legacy Excel) formats are supported.
What about dates and numbers?▾
Excel dates and numbers are converted to their text representation in the CSV. Number formatting (like currency symbols) may be simplified.
// Related tools

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