Convert your .csv files to .xlsx format online. No software to install.
Free account: 10 conversions a month. Pro: 100 a month.
Drag and drop your .csv file or click to browse.
Select XLSX as your output format.
Click Convert and download your .xlsx file.
Converting CSV to Excel format lets you add formatting, formulas, charts, and multiple sheets to your raw data. This is essential when you need to present data professionally, perform calculations, or share organized reports with colleagues who work in Excel or Google Sheets.
CSV (Comma-Separated Values, introduced in 1972) uses None (plain text) compression. XLSX (Office Open XML Spreadsheet, introduced in 2007) uses ZIP (containing XML parts) compression. CSV browser support: Universal (displayed as plain text). XLSX browser support: None (requires office application or online viewer).
The quality impact depends on the specific settings used during conversion. XLSX uses compression that may affect quality depending on the chosen settings.
Typical CSV file size: 100,000 rows x 10 columns of text: ~5-15 MB. Typical XLSX file size: A 10,000-row spreadsheet with formulas: ~500 KB - 2 MB. Expect a dramatic file size reduction — often 5-20x smaller — when converting from uncompressed CSV to XLSX.
When importing CSV to Excel, check the delimiter detection — some CSV files use semicolons instead of commas, especially in European regions. Also verify that date columns are parsed correctly, as CSV date formats vary widely and Excel may misinterpret them.
Free account: 10 conversions a month. Pro: 100 a month. No watermarks.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Your file is sent over an encrypted connection to our provider CloudConvert, which converts it and deletes it after the conversion, within 24 hours at most. Details in our Privacy Policy.
Convert files from any device: desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .xlsx file maintains the best possible quality. No unnecessary compression or quality loss.
Free account: 10 conversions a month. Pro: 100 a month.
It depends on the file size and on the queue at our provider. Small files usually take a few seconds.
Your file is sent over an encrypted connection to our provider CloudConvert, which converts it and deletes it after the conversion, within 24 hours at most. Details in our Privacy Policy.
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.