CSV – Comma-Separated Values
CSV stores table data as plain text with values separated by commas. Almost every spreadsheet and database can import and export it, but it keeps no formatting or formulas.
More CSV conversionsDrop your CSV files here
or click to choose CSV files · up to 95MB each
How to convert CSV to XLSX
- Choose your files. Click Select File or drag your CSV files into the upload box. You can add many at once.
- Pick the settings. XLSX is already selected as the output format. The conversion starts as soon as a file is added.
- Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.
Why convert CSV to XLSX?
CSV files from banks, shops, school portals and exports open in Excel, but formatting, formulas, several sheets and charts are lost as soon as you save. Converting to XLSX gives a proper workbook you can format and keep.
When to keep the CSV
Keep the CSV when another program needs to import the data again; CSV is the simplest exchange format.
Tips for the best result
- Commas separate the columns; each line becomes a row.
- Check columns with leading zeros, such as phone numbers or postal codes, and format them as text if needed.
- After converting, use Excel to add formatting, formulas and charts.
Common problems and fixes
- Everything is in one column.
- The file probably uses semicolons or tabs between values. Use TSV to XLSX for tab-separated files.
- Leading zeros disappeared.
- Numbers are detected automatically. Format the column as text in Excel and re-enter, or keep the original CSV for those values.
XLSX – Microsoft Excel Workbook
XLSX is the standard Excel format. It stores sheets, formulas, formatting and charts in a zipped XML package.
More XLSX conversionsConverting CSV to XLSX
- CSV and TSV keep only the first sheet and no formatting.
Frequently asked questions
Will Urdu or other non-English text work?
Yes, if the CSV is saved as UTF-8, which most modern exports are.
Can one CSV become several sheets?
No. A CSV holds one table, so the workbook has one sheet.
How do I convert CSV to XLSX?
Click Select File or drop your CSV file onto the upload box. The converted XLSX appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Is it really free?
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Are my files stored?
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
Will quality drop?
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.
How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.