ConvertiZen

Convert Excel to CSV Without Uploading Your File

Worried about uploading sensitive Excel files to an online service? ConvertiZen converts Excel to CSV entirely inside your browser — nothing is ever sent over the internet. This is ideal for confidential documents: contracts, medical records, financial statements, and anything else you'd rather keep private.

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Accueil › Excel → CSV › Convert Excel to CSV Without Uploading Your File

How client-side conversion works

Traditional online converters upload your Excel file to their servers, process it there, then send back a CSV file. Your data crosses the internet twice and sits on someone else's machine in the middle. ConvertiZen uses WebAssembly to run the entire conversion pipeline locally in your browser. The Excel→CSV process happens on your CPU, using your RAM. Our server never sees a single byte of your file.

FAQ

Is my Excel file uploaded to convert it to CSV?

Never. WebAssembly converts it locally in your browser.

Is this safe for confidential Excel files?

Yes. Nothing leaves your device during or after conversion.

Can ConvertiZen access my Excel file content?

No. We have no technical ability to see your files — they never reach our servers.

What happens to my Excel file after conversion?

Nothing. It stays in your browser memory, which is cleared when you close the tab.

Is this GDPR-compliant?

Yes. No personal data or file content is processed on our servers.