How to Compress Outlook MSG File Size?

Published On

February 1st, 2026

Reading Time

6 Minutes Reading

Get here the step-by-step method to compress Outlook MSG file quickly and safely without facing issues.

If you use the Outlook app, you’ve probably noticed how quickly Outlook MSG files can pile up and take up valuable space. Each email saved especially with attachments can be megabytes. Over time, these large MSG files on your system can slow it down and make it difficult to share.

The Good News? You can compress Outlook MSG file size to save space and make them easier to share. In this informative blog, we will explain why compressing MSG file is important, the best methods to compress Outlook MSG files, and answer some common questions about Outlook MSG file compression.

So, if you are one of them who needs to compress a large MSG file, keep reading the blog and get this task completed using a reliable and effective method.

Why Reduce MSG File Size?

Here are the most common reasons why compressing Outlook MSG file makes sense:

Save Valuable Space: MSG files can become too large when they include attachments. Compressing MSG files can save valuable space.
Faster Email Sharing: If MSG files are smaller, they can be easily sent via email or cloud services.
Easier Backup and Storage: When you compress Outlook MSG file size, they will take up much less space on your computer or external hard drive.
Better File Management: Compressing MSG file size helps in better file management.

How to Compress Outlook MSG File?

There are many ways that can help you compress Outlook MSG file size. Below, we will explain some popular methods that help you make this task effortless.

Method 1: Use the Built-in ZIP Compression (Windows)

Select one or more Outlook MSG file you need to compress.
Right-click on the MSG file, choose Send to option and select Compressed (zipper) folder.
A new zip file will appear in same folder.

Result: Your Outlook MSG files are compressed now into a single and smaller zip file.

Method 2: Use File Compression Software

If you need more advanced solution, then try the tools such as WinRAR, 7-Zip, or PeaZip.

Step-by-Step

Install any of the tool, right click on the MSG file, choose add to archive or compress.
Choose the Compression level such as normal, high, or ultra.
Save your archive file.

Tip: Ultra or Maximum compression option will give you the smallest file size. But it may take longer to process.

Method 3: Remove Attachments Before Compressing MSG File

As we all know, attachments are larger in size so they make the MSG file size large. You can save the attachments before compressing the Outlook MSG file.

Step-by-Step

Open the Outlook MSG file.
Save attachments to folder on your computer.
Now, delete attachment from your MSG file.
Save the MSG file as .msg file again.
Now, compress the file using 1 or 2 method.

These three methods are good for compressing MSG files. They are recommended if you only want to compress a few files. But if you have so many files, it is recommended to use any solution that supports compressing multiple MSG files at once.

Guess what? There is a solution that offers several advanced features to compress Outlook MSG files. It’s a complete solution so ghat you don’t have to go anywhere else.

Want to know about the method? Read further.

Best and All-in-One Method to Compress Outlook MSG File

4n6 Email Compressor is the most reliable, fast, and efficient application to compress MSG file size. This software is developed in such a way that it can easily compress the size of multiple MSG files at once. It offers many ways to compress Outlook MSG files. Furthermore, this software has a very simple and intuitive interface. You can easily download and use this software on your Windows computer and reduce the size of your Outlook MSG files without facing any kind of issues.

Start by using the free demo version of the tool to check the functionality and features. If you are satisfied, proceed with purchasing the license.

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Step-by-Step Guide

After downloading, install the program, run it, and click the Open button.
From the given options, please select the Email Data Files option.
Choose the MSG files option and browse MSG files or folders as per your need.
The tool loads the selected MSG files or folders on the left panel.
Click the loaded MSG files and preview them before the compression process.
Click the Compress and Save button and choose the required file-saving option like PST, MBOX, and more.

Note: The software does not support compressing MSG files back into the MSG format. You have to choose another file-saving format supported by the tool.

Browse the location where you need to save the compressed Outlook MSG files.
Choose the option Compress Inline Images, if needed.
Select the given options such as Remove Attachments, Extract, Save and Strip Attachments, or Zip and Add All Attachments.
Enable the required advanced filters provided by the software.
Finally, click the Save button to begin the Outlook MSG compression process.

The application starts compressing the size of the Outlook MSG file. The compression process will only take a few moments. Once the process is finished, you will get the full message.

Similarly Read:
How to Compress OFT File Size?
How to Compress Large vCard Files?
Best Way to Reduce OST File Size

Key Benefits of the Tool

You can compress Outlook MSG files by removing attachments.
Allows you to compress inline images embedded in Outlook MSG files.
Comes up with the very simple graphical user interface for the ease.
You can download and operate this program on any version of Windows.
While compressing Outlook MSG file size, the tool maintains content.
There are no file size limitations imposed on this powerful program.

Frequently Asked Questions (FAQs)

Q: Is it possible to compress Outlook MSG file size without losing and altering important data?

The recommended 4n6 software ensures accurate and 100% secure compression. It compresses MSG files without losing content and altering formatting.

Q: How much space can I save by reducing size of Outlook MSG file?

It totally depends on how many files and what method you are using to reduce Outlook MSG file size.

Q: Is it safe to compress Outlook MSG file size?

Yes, if you are using the trusted software, it is completely safe to reduce the MSG file size.

Also Read:
How to Compress MBOX File Size?
How to Reduce Large EML File Size?

Conclusion

In the above blog, we covered the topic of how to compress Outlook MSG file size. Here, we have explained everything about this topic. We have provided the best way to compress MSG files without losing important content and formatting.

Pro Tip: It is recommended that you download for free and test the recommended 4n6 software first. Freeware is added to test the full functioning and features without investing anything. If you feel that the app works well for you, then you can purchase the licensed version.

Thanks for reading.

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