Convert CSV to XLSX online, free
CSV vers Excel — processed on our secure servers in France. Files deleted after conversion, no sign-up.
Drop your CSV file here
or click to choose a file — conversion to XLSX
CSV vs XLSX — technical comparison
Frequently asked questions
How to convert CSV to XLSX?+
Drop your CSV file in the zone above, or click to select it. The XLSX conversion starts automatically on our secure servers — no software to install.
Is converting CSV to XLSX secure?+
Yes. ConvertLab processes your files on secure servers located in France, over an encrypted connection. They are never shared with any third party and are deleted immediately after the conversion.
Is there quality loss when converting CSV to XLSX?+
Quality depends on the conversion settings. ConvertLab lets you adjust quality before starting.
What is the maximum file size?+
Since the conversion runs on our servers, the limit no longer depends on your device. Files up to 100 MB are accepted. With NoLimit, up to 1 GB per file (250 MB for video).