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How do I convert XLSX to XLS without losing data?

Author

Mia Phillips

Updated on February 23, 2026

How do I convert XLSX to XLS without losing data?

Option 1: Convert XLSX to XLS directly in Excel
  1. Open the XLSX file you want to convert.
  2. In Microsoft Excel, go to the File tab located at the top left.
  3. Click on the “Save as” option and select “Excel 97-2003 Workbook (*.
  4. Select the folder where you wish to save the file and confirm by clicking the “Save” button.

Thereof, how do I convert multiple XLSX files to XLS?

Quickly convert multiple XLSX files to XLS or PDF files from local disk or OneDrive

  1. Click Kutools Plus > Workbook > Format Converter to enable the feature.
  2. Apply this feature by clicking Kutools Plus > Workbook > Format Converter.
  3. Click Kutools Plus > Workbook > Format Converter to enable the feature.

Beside above, how can I convert XLSX files without opening? Converting XLS to XLSX

  1. Run 'Convert XLS' then select the Convert Files Action To Do.
  2. Select the input file path. For a whole folder be certain to use the *.
  3. Specify the output file path.
  4. Click the CONVERT button (or F5) on the tool bar to start converting.

Beside this, how do I open an XLSX file in XLS?

How to open an XLSX file

  1. Step 1: Double click on the XLSX file. To open XLSX files in Excel, simply double click on the file.
  2. Step 2: Drag and drop the XLSX file onto an Excel window to open it.
  3. Step 3: “Open with” – open the XLSX file in Excel using the right-click menu.

What is the difference between Excel XLS and XLSX files?

The underlying file format is what makes the main difference between the XLS and XLSX files. Data is arranged in an XLS file as binary streams in the form of a compound file as described in [MS-XLS]. In contrast, an XLSX file is based on Office Open XML format that stores data in compressed XML files in ZIP format.

How do I convert an xlsx file to XLS?

Click on the Office button, then Convert. You can also try opening the .xls file in Excel > then use the Save As command to save as an "Excel Workbook". Once you select that file type, the file extension will be xlsx and you can delete the old xls version.

How do I convert XLS to xlsx?

How to convert XLS to XLSX online for free
  1. First, save the XLS to PDF.
  2. Download the first file, and then click 'PDF to Excel' on the footer.
  3. Drag the downloaded file into the second, darker green toolbox.
  4. It will now convert to XLSX. Download this file.

How do I save an Excel file as xlsx in C#?

To convert XLS to XLSX in C# - simply load an XLS Excel workbook with IronXL, and then save with the ".xlsx" file extension. Note that images, charts, split panes, freezing panes will not always be copied between XLS and XLSX formats.

How do I convert multiple xlsx to CSV?

  1. Press F5 key, select the folder contains the Excel files you want to convert to CSV files in first popping dialog.
  2. Click OK, then in the second popping dialog, select the folder to place the CSV files.
  3. Click OK, now the Excel files in the folder have been converted to CSV files and saved in another folder.

How do I save a XLSX file?

Save to Different File Formats
  1. Click the File tab.
  2. Click Save As.
  3. Click the Save as type list arrow. The default file type is an XLSX Excel file, but you can choose from plenty of other file formats in this menu.
  4. Select the desired format.
  5. Click Save.

How do I create an XLSX file?

Create an Excel XLS or XLSX in C#
  1. Create an instance of Workbook class.
  2. Access the first worksheet (created by default) of the workbook.
  3. Access the desired cell(s) of the worksheet and put the value in the cell(s).
  4. Save the workbook as an XLS or XLSX file.

Should I use XLS or XLSX?

XLSX is the ugly step-sister that won't allow macros. xls binary file format could not handle data beyond row 65,536. So, the new . xlsb file format is a proprietary binary file format that can handle the 17 billion cells in Excel.

Which app is needed to open XLSX files?

A file with the . xlsx file extension is a Microsoft Excel Open XML Spreadsheet (XLSX) file created by Microsoft Excel. You can also open this format in other spreadsheet apps, such as Apple Numbers, Google Docs, and OpenOffice.

What is the difference between XLSX and CSV?

In a xlsx you can save the formulas, graphs, pivots, etc in the file. A CSV is just a flat text file that uses a delimiter to separated the fields, e.g. Although Excel can read the fileformat and you can use formulas in it, you cannot save the formulas in the sheet. Excel will only save the result of the calculation.

Why can't I open XLSX files?

Method 1.

But Excel since 2007 saves files in the XLSX format. A mismatch between file extension and Excel version may cause the error “Excel cannot open the file because the file format or file extension is not valid”. Open Excel and, on the taskbar, select File. Then select Options -> Export -> Change File Type.

What are the 11 data formats in Excel?

The most common data formats used to store data in files that can be read data into Excel are:
  • Existing Excel workbook or worksheet with extension .xls.
  • Existing Excel workbook or worksheet with extension .xlsx.
  • Comma-separated values text file with extension .csv.
  • Text file, often with extension .txt or extension .asc.

What is the extension of a Excel file?

The Microsoft Excel Binary File format, with the .xls extension and referred to as XLS or MS-XLS, was the default format used for spreadsheets in Excel through Microsoft Office 2003.

How do I open an XLSX file in Chrome?

And here, we listed the step-by-step instructions:
  1. Install the Office Editing for Docs, Sheets & Slides Google Chrome Extension.
  2. Locate a word doc or excel spreadsheet in Windows explorer (you may need to download it from an email if you don't have anything saved locally)
  3. Right click the file and select Open With.

How can I open an Excel file without Microsoft Office?

How To Open Excel File Without Excel?
  1. Using Chrome Browser's Free Extension. You can open XLS/XLSX file easily in your Chrome browser just by using a free extension.
  2. Excel Viewer.
  3. Apache OpenOffice.
  4. Microsoft Office Compatibility Pack.
  5. XLS Viewer 2.30.
  6. Google Docs.
  7. Zoho Sheets.
  8. WPS Office.

Is XLS still supported?

File formats that are not supported in Excel

The following file formats are no longer supported in Excel 2016, Excel 2013, Excel 2010, Excel Starter, and Excel 2007.

What is XLSX Excel?

The XLSX file extension is associated with files saved with Microsoft Excel (2007/2010), one of the most popular and powerful tools you can use to create and format spreadsheets, graphs and much more. The . xlsx files are used in Microsoft Excel (2007/2010) for Workbooks, spreadsheet, and document files.

How do I save an XLSX file in Excel 2010?

Select "Excel Workbook" from the menu. Select the location where you want to save your file, give it a name and click "Save." Your file will now be saved with the file extension . xlsx instead of .

How do I open an XLSX file in Excel 2003?

How to Open Xlsx in Excel 2003
  1. Access the Microsoft Downloads website. Type "Compatibility Tool" in the search box.
  2. Open Excel 2003 and locate an Excel 2007 workbook. Click "File" on the menu bar, then click "Open." Browse your files and locate the workbook.
  3. View the xlsx workbook in Excel 2003.

What's the best format to save Excel files?

Most of the time you use the XLSX format: It's save (can't store malicious code), has the maximum number of rows and columns and is best known. XLSX is available since Excel 2007 and replaces the old XLS file type. It uses the open XML standard so which is documented well.

What is the difference between XLS and XLSM files?

Both XLS and XLSM files are spreadsheet files for Microsoft Excel, a widely-used spreadsheet program. The main difference between the file types is that XLSM files contain macros and XLS files do not.

What should I save Excel file as?

You can save an Excel 2007 or later workbook in the file format of an earlier version of Excel, in a text file format, and in other file formats, such as PDF or XPS. By default, files are saved in the .xlsx file format, but you can change the default file format for saving.

Is XLSX an Excel file?

The XLSX and XLS file extensions are used for Microsoft Excel spreadsheets, part of the Microsoft Office Suite of software. XLSX is part of Microsoft Office Open XML specification (also known as OOXML or OpenXML), and was introduced with Office 2007. XLSX is a zipped, XML-based file format.

Can Excel 2010 Open XLSX files?

Microsoft Excel 2010 supports the use of an XML-based file format called the Microsoft Office Open XML format. This file format carries the filename extension . xlsx extension unless you choose to save the file in a different format. Fortunately, Excel 2010 has no trouble opening any workbook files saved in the .

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