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Reduce Excel File Size

Reduce Excel File Size

Reduce Excel File Size (Table of Contents)

  • Introduction to Reduce Excel File Size
  • How to Reduce Excel File Size?

Introduction to Reduce Excel File Size

Excel workbooks are unreasonably sometimes large and thus become quite slow due to their heavy size. As a result, they become difficult to be shared via mail. Also, large files reduce the read and write time of the disk and RAM.
The large size of excel workbooks is acceptable by Excel, however, they cause some other troubles, like trouble to share via mail, etc., for which it becomes quite important to reduce their size.

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Some of the common reasons that can increase the size of an Excel workbook are:

  • Large data like worksheets with rows/columns more than 100,000.
  • Heavy images in the file.
  • Pivot Tables with large data.
  • Invisible contents.
  • Formatting: In case worksheets are formatted although cell ranges are not used, the file size may also increase
  • Hidden worksheets.
  • Unnecessary worksheets, i.e. worksheets that are of no use.
  • Data formatting on empty cells.
  • Hidden rows/columns.

The way to reduce the size of an Excel workbook is different for the above reasons.

How to Reduce Excel File Size?

In the below examples we will show how to reduce the size of an Excel workbook via some of the most common methods (when the size is large due to different reasons like above). Some common ways to reduce the size of an Excel workbook.

You can download this Reduce File Size Excel Template here – Reduce File Size Excel Template

Example #1 – Removing Unnecessary Worksheets

Let us say we have an Excel file with 8 worksheets in it, and each worksheet has 26 columns with 15,000 data points in each column. Now if we wish to reduce the file size, we follow the below steps.

  • Click on ‘File’ and see the size of the file in the ‘Properties’ section.

Reduce the size in excel 1-1

So we can see in the above screenshot that the file size is 1.10MB. Now if we delete some of the worksheets, let’s say 4 (which are unnecessary), then the file size gets reduced to 46.1KB.

Reduce Excel File Size 1

So we can see that the excel file size is now reduced to 46.1KB.

Example #2 – Compressing the Size of Images

Excel workbooks are sometimes large in size due to some pictures within it. Let us say we have an Excel file with an image in a worksheet. Now if we wish to reduce the file size by compressing the image size, we follow the below steps:

  • Click the image in the worksheet and then activate the ‘Format’ ribbon as follows.

Reduce the size in excel 1-3

  • Now click on ‘Compress Pictures’:

Reduce the size in excel 1-4

  • On doing this, a new pop-up window will appear as below:

Reduce the size in excel 1-5

  • Now click on ‘Email (96 ppi)’ and select the first two options in the ‘Compression options’ section in case there is more than one image/picture (and we wish to compress each) and also when we wish to delete the cropped areas of image/picture as well. Then click on ‘OK’:

Reduce the size in excel 1-6

  • On doing this, the Excel file size will be reduced.

Example #3 – Zip the Excel File

Another way to reduce the size of an Excel file is to zip the file. This would reduce the size to 10-15% approximately.  Following steps can be used to zip the file:

  • Let’s say we have an Excel file whose size we see is 1137 KB.

Zip File 1-1

  • After saving the file, right-click on the file folder and move or hover the cursor to ‘Send To’ option and then click on ‘Compressed (zipped) folder’.

Zip File 1-2

  • This would now create a zipped file for the same and thus we will observe a reduction in file size (138 KB):

Zip file 1-3

 Example #4 – Removing Unused or Unnecessary Data Formatting

Another reason for the increase in Excel file size is the data formatting applied to it, like cell color, font style, background color, borders, etc. So we can look for formatting that we can avoid and then select that data and remove it from the workbook. Let’s say we wish to remove the formatting applied to a worksheet, say to Sheet6 named as ‘Example4’ in a workbook.

Unnecessary Data Formatting 1-1

To do this, we will follow the below steps:

  • Select the data from which we wish to remove the data formatting:

Unnecessary Data Formatting 1-2

  • Click on the ‘Home’ tab and then expand the ‘Clear’ dropdown in the ‘Editing’ section as below.

Unnecessary Data Formatting 1-3

  • Now click on ‘Clear Formats’ on expanding the dropdown.

Unnecessary Data Formatting 1-4

  • This would now reduce the file size of the Excel workbook after saving it.

Unnecessary Data Formatting 1-5

 Example #5 – Deleting / Clearing Unused Cell Ranges

Another way that can help reduce the size of an Excel workbook is to delete the unused portions below and on the right of the data.

Deleting/Clearing Unused Cell Ranges 1-1

  • To delete/clear the unused rows below the last used row and unused columns to the right of the last used column, select the unused rows and columns. (To select the unused rows and columns, we can press Ctrl+Shift+Down arrow key and Ctrl+Shift+Right arrow key respectively).
  • Now expand the ‘Clear’ dropdown in the ‘Home’ section and select ‘Clear All’.

Similarly, select the unused columns and repeat the same.

Things to Remember About Reduce Excel File Size

Some things that can help in reducing the size and hence the performance of Excel workbooks are:

  • There might be cases when an Excel workbook has some hidden worksheets. The hidden worksheets which are of no use should be removed as they are also a reason for the increased size of Excel workbooks.
  • Avoid using volatile functions like OFFSET(), RAND(), TODAY(), etc. as they make the workbook slow.
  • Referencing an entire row or column in a formula should be avoided.
  • In case a summary is to be created for a large numerical dataset, then pivot table should be preferred over formulas (if possible) as pivot tables are fast and intuitive
  • The tabular data should be first converted to an Excel table and then be used in formulas for faster performance of the workbook
  • In case the workbook has a lot of formulas, then the manual calculation should be preferred over automatic calculation
  • Unused content should be removed
  • Excel files should be saved preferably in .xslx, .xslm, .xlsb formats

(.xlsb is a binary file format that can accommodate macros as well and would save the excel file in binary mode)

Recommended Articles

This is a guide to Reduce Excel File Size. Here we discuss How to Reduce Excel File Size along with practical examples and downloadable excel template. You can also go through our other suggested articles –

  1. Change Chart Style in Excel 
  2. Excel Show Formula
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