How to Split Large PST File Into Smaller Parts?

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As an Outlook user, encountering massive PST files can be daunting and frustrating to handle. Large PST data files can slow down your Outlook, increase the risk of corruption, and make data management more challenging. If you are searching for how to split large PST files into smaller parts, you’re not alone. In this blog, we’ll walk you through both manual and professional methods to split PST files. From manual steps to using a professional PST Splitter Tool, we’ll cover everything you need to streamline your Outlook experience.

Why Do User Want to Split Outlook PST File into Smaller Parts?

Benefits of splitting a pst file into smaller subunits. Some of them are mentioned below.

  • Performance: Heavy PST files can slow down our device, when we split the PST file, it becomes more easily accessible on any device.
  • Management: Properly splitting PST files can help to manage them accordingly, even it can be used as a backup file for a particular/important section of the mailbox.
  • Data Loss: Splitting an oversized PST file can safeguard your data from corruption and loss.
  • Sharing: After splitting the PST file, sharing becomes easier when users transfer smaller files to someone else.

Best Way to Split PST Files Into Smaller Parts

There are mainly two ways to split PST files into smaller parts. Here, we are going to discuss both the manual and professional methods one by one.

#1 Manual Method to Break PST into Smaller Files

In this section, we are discussing two steps that will use Microsoft Outlook to perform the steps.

Manual Method 1. Splits the PST File Using Microsoft Outlook

  • First, Open MS Outlook.
  • Next, go to FileOpen & Exportimport/Export.
  • Now, choose Export to a File and hit Next.
  • Select Outlook Data File(.pst) and tap Next.
  • Pick a file/folder you want to split.
  • Set a name and destination path to save split files.
  • Finally, click Finish to start the split process.

We need to perform this method each time for every file/folder.

Manual Method 2. Using Archive Option of Outlook to split PST

  • First, run the Outlook application on your device.
  • Then, go to FileInfoToolsClean up old items.
  • Next, click on the “Archive this folder and all subfolders
  • Now, select the mail folder to archive.
  • After that, enter a date under “Archive items older than”.
  • Tap on Include items with the Do not AutoArchive checkbox and press OK.

#2 Proficient Method to Split PST File into Smaller Parts

One of the best and simplest methods is to perform by using a PST Splitter. This tool helps split your PST file by size, date, sender, or folder option. Due to its intuitive GUI, any user whether they have technical knowledge or not can operate the tool smoothly and perform the splitting process without losing any data. Additionally, it has an in-built feature to ignore the duplicates present in it even you can save all the files separately and can protect those files using a password.

Steps to Break PST Into Smaller Files

  • First, download and then run the PST Splitter on your device as an administrator.
  • Then, click Add File to choose the PST file from the device
  • Once selected, you need to click on the Next button and choose any option related to how you want to split your file by size, Date, Sender, or folder.
  • Tick all the folders you want to split from the tree structure and hit Next.
  • Now add the size of the new PST to create.
  • After that, set the name and destination to save the resultant files.
  • Finally, click the Split button to start the splitting process.

Also Read: Open PST File On Mac With/Without Outlook


We conclude this blog with our last word, the whole blog describes how to split PST file into smaller parts. Reading this blog will provide you with the knowledge to easily and quickly split the PST file into smaller chunks. The blog contains a manual and professional method, which uses MS Outlook and the PST splitter tool to split, with its step-by-step guidance a user will find it easy to perform those methods.

About The Author:

Pradeep is a dedicated technical content writer who thrives on the intersection of technology and storytelling. With a background in engineering and a passion for writing, he brings a unique blend of technical expertise and creativity to his work. Pradeep’s articles not only educate but also entertain, making complex technical subjects approachable and intriguing for a broad audience. His work has been featured in numerous tech blogs, making him a trusted source for tech enthusiasts and novices alike.

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