CSV to XLSX Converter
Free online tool to convert CSV to XLSX files quickly and securely. No installation required – start converting your files in just a few clicks!
Drag and drop your files here or click to upload.
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Maximum file size is 1GB
How It Works
How to Convert CSV to XLSX
Click inside the file drop area to upload your CSV file or drag & drop it.
Locate your CSV file on your device—typically used for various purposes. Ensure the file is under 50MB to avoid upload issues. If the upload fails, check your internet connection or try compressing the file first.
Select XLSX as the output format and click the 'Convert' button.
Choose XLSX based on your needs—different formats suit different purposes, like JPEG for smaller file sizes. The conversion process typically takes a few seconds, depending on file size and server load.
Download the converted XLSX file instantly after conversion.
Once the conversion is complete, click the download link to save your XLSX file. You can then open it in software like a compatible viewer. If the file doesn’t download, ensure your browser allows pop-ups from RunConvert.
You can also send a link to the converted file via email. (Optional)
Enter an email address to receive a secure link to your converted file, which is useful for sharing with clients or accessing later. Links expire after 24 hours for security, and RunConvert ensures your data is protected during transmission.
Convert Your CSV files to other formats
RunConvert.com can convert your CSV files to these other formats:
Convert Your CSV files to other formats
Convert Files to CSV Format
RunConvert.com supports these converters to CSV format:
Convert Files to CSV Format
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Frequently Asked Questions
Here are some common questions and answers about csv and xlsx file conversions asked by our users on RunConvert.com.
Frequently Asked Questions
Q: What’s a CSV file, and why would I convert it?
A: A CSV, or Comma-Separated Values file, is like a bare-bones spreadsheet—simple text with data in rows and columns. You might convert it to XLSX or PDF to add formatting or share it professionally. RunConvert.com makes it a breeze to switch formats, like turning a rough sketch into a polished blueprint.
Q: What’s the best format to convert CSV to for editing?
A: XLSX is the go-to for editing in Excel. RunConvert.com makes the switch seamless, so you can jump into formulas and charts right away.
Q: How fast is XLSX conversion on RunConvert.com?
A: Super quick—just seconds! XLSX files are usually lean, so RunConvert.com processes them in a flash.
Q: Do I need Excel to convert XLSX files?
A: Not at all! RunConvert.com handles XLSX files online, no software needed. It’s like having a universal key for your spreadsheets.
Q: Can I use RunConvert to convert spreadsheet files?
A: You sure can! RunConvert.com handles tons of spreadsheet conversions—Excel, CSV, ODS, TSV, and more. Just upload your file, pick your output format, and you're golden.
Q: How do I fix broken rows or columns after conversion?
A: That’s often a delimiter issue. Try opening the file in a text editor to see if commas or tabs are breaking the layout, then import it properly.
Q: Can I convert a spreadsheet into a presentation format like PPT?
A: Not directly. You’d need to export data as images or copy tables manually into slides for now.
Q: Will formulas work after conversion?
A: If you're converting to another spreadsheet format like ODS or XLSX, formulas usually transfer just fine. But CSV or PDF? Not so much—they flatten the data.
Q: Can I convert spreadsheets with multiple tabs?
A: Yes, but not all formats support multiple sheets. XLSX and ODS do, but CSV flattens everything into one sheet. If tabs matter, avoid CSV.
Q: Can I convert Excel macros too?
A: Short answer: not really. Most formats don’t support macros. So if you rely on those sweet VBA scripts, keep the file in Excel format.
What is CSV (Comma-Separated Values)?
CSV (Comma-Separated Values) is a simple text-based file format used for storing tabular data, such as spreadsheets or databases. Each line of a CSV file represents a row, and each value within a row is separated by a comma.
CSV files are commonly used for data exchange between different applications and are easily opened and edited by spreadsheet programs like Microsoft Excel, Google Sheets, and other data processing tools.
How to open CSV?
CSV files can be opened using spreadsheet programs such as Microsoft Excel, Google Sheets, or LibreOffice Calc. You can also open them using text editors like Notepad or Sublime Text, although they won't display the data in a table format.
To open CSV files in Excel or Google Sheets, simply double-click the file or import it into the application.
CSV is Developed by: International Organization for Standardization (ISO)
CSV was Released on: 1983
Useful Links for CSV:
How to convert CSV?
You can convert CSV files to other formats, such as Excel (.xlsx), JSON, or TSV (Tab-Separated Values), using online file converters. Simply upload your CSV file, choose the desired output format, and let the converter do the work.
Many spreadsheet applications like Excel also allow saving CSV files in various formats for easier use across different platforms and applications.
What is XLSX (Excel Spreadsheet)?
XLSX (Excel Spreadsheet) is a file format used by Microsoft Excel to store spreadsheets. It is a more modern and efficient version of the older XLS format and is based on XML (Extensible Markup Language).
XLSX files can store multiple sheets, data tables, charts, graphs, and more complex data structures. This format is widely used for organizing, analyzing, and visualizing data.
How to open XLSX?
XLSX files can be opened using spreadsheet programs like Microsoft Excel, Google Sheets, LibreOffice Calc, and Apple Numbers. These applications fully support the features of XLSX files, such as multiple sheets, formulas, and charts.
To open XLSX files in Excel or Google Sheets, simply double-click the file or import it directly into the application.
XLSX is Developed by: Microsoft
XLSX was Released on: 2007
Useful Links for XLSX:
How to convert XLSX?
You can convert XLSX files to other formats, such as CSV, PDF, or JSON, using online file converters. Upload the XLSX file and choose the desired output format.
Many spreadsheet applications like Excel also allow saving XLSX files in other formats, enabling cross-platform compatibility.
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