XLS naar XLSX Converteren

Free online XLS to XLSX converter. Fast, secure, no signup required.

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Accepted: XLS files · Max 100 MB per file

xls xlsx

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Need to convert XLS to XLSX? MegaConvert makes it easy. Upload your Microsoft Excel Spreadsheet (XLS) file and get a Microsoft Excel Open XML Spreadsheet (XLSX) file in seconds — no software to install, no signup required. Whether you need this conversion for data analysis, office work / email attachments, our online converter handles it instantly. Free for files up to 25MB, with support for larger files up to 2GB.

How to Convert XLS to XLSX Online

1
Upload your XLS file
Click the upload area or drag and drop your XLS file. Files up to 25MB are free. Larger files are supported with pay-per-use.
2
Choose XLSX as output format
XLSX is automatically selected on this page. You can adjust conversion settings if needed.
3
Click Convert
Hit the Convert button to start processing. Your file will be converted using our high-performance servers.
4
Download your XLSX file
Once conversion is complete, click Download to save your new XLSX file. Free files are available for 1 hour.

Why Convert XLS to XLSX?

**Modernize your files** — XLS is an older format. Converting to XLSX ensures better compatibility with current software and devices.
**Better efficiency** — XLSX offers improved compression and quality compared to older formats, reducing file sizes while maintaining fidelity.
**Reduce file size** — Converting between formats can significantly reduce file size, making files easier to share via email or cloud storage.
**Software requirements** — Your software or platform may require XLSX format specifically. Converting ensures full compatibility.

XLS vs XLSX — Format Comparison

Feature	XLS	XLSX
Full Name	Microsoft Excel Spreadsheet	Microsoft Excel Open XML Spreadsheet
Developer	Microsoft	Microsoft
First Released	1987	2007
Category	Spreadsheet	Spreadsheet
Extension	.xls	.xlsx
MIME Type	application/vnd.ms-excel	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Formulas, charts, and macros may not transfer to simpler formats like CSV.

About XLS Format

Legacy Microsoft Excel binary format for spreadsheets with formulas and charts.

Full name: Microsoft Excel Spreadsheet

Developer: Microsoft (1987)

About XLSX Format

Modern Microsoft Excel format based on Open XML standard with ZIP compression.

Full name: Microsoft Excel Open XML Spreadsheet

Developer: Microsoft (2007)

Veelgestelde Vragen

Upload your XLS file to MegaConvert.io, select XLSX as the output format, and click Convert. Your converted file will be ready to download in seconds. No software installation required.

Yes! Files up to 25MB can be converted for free, up to 3 times per day. For larger files, pay-per-use pricing starts at just $2 for files up to 100MB.

Absolutely. All uploaded files are encrypted in transit (HTTPS), scanned for viruses, and automatically deleted after conversion. We never share or access your files.

Free users can convert files up to 25MB. Pay-per-use supports files up to 2GB. Subscribers get up to 2GB with priority processing.

Legacy Microsoft Excel binary format for spreadsheets with formulas and charts. Developer: Microsoft (1987).

Modern Microsoft Excel format based on Open XML standard with ZIP compression. Developer: Microsoft (2007).

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