Convert CSV → XLSX Online — Free
Import CSV data into Excel XLSX spreadsheet.
Drag & drop or click to browse
Accepts .csv files up to 20 MB
Free plan includes 10 conversions/day. Need more? Talk to us →
What is a .csv file?
CSV is a widely-used format in the Data Format category. Import CSV data into Excel XLSX spreadsheet. Files in this format are commonly used across various tools, pipelines, and workflows.
What is a .xlsx file?
XLSX is a popular format in the Data Format ecosystem. Converting from CSV to XLSX gives you access to its unique features, broader tooling support, and improved interoperability.
How to convert CSV → XLSX online
Upload your file
Drag & drop your .CSV file onto the upload zone, or click "Browse" to select it.
Validate & preview
The tool checks the file type and size before uploading. Invalid files are rejected immediately with a clear error.
Convert on the server
Click "Convert" to upload and process your file. Server-side conversion typically takes ~5 seconds.
Download your result
When done, click "Download .XLSX" to save your converted file. Files are securely deleted after 1 hour.
Frequently asked questions
Is this CSV to XLSX converter free?
Yes. The CSV → XLSX tool is free for up to 10 conversions per day. Pro (100/day) and Business (unlimited) plans unlock higher limits.
Is my file secure on the server?
Your file is uploaded over an encrypted HTTPS connection to a secure server worker. The converted file is stored temporarily and automatically deleted after 1 hour. We never share or store your files longer than necessary.
What is the maximum file size for CSV?
You can convert files up to 20 MB. If your file is larger, consider compressing it first or upgrading to a Business plan for increased limits.
What is the difference between CSV and XLSX?
CSV and XLSX are both formats in the Data Format category, each with different use cases, tooling support, and feature sets. Import CSV data into Excel XLSX spreadsheet.
Can I convert multiple files at once?
Batch conversion is available on Pro and Business plans. Free users convert one file at a time.