PST File Splitter Tool — Split Large Outlook PST Files
Download the best PST file splitter software to split large Outlook PST files into smaller parts without Microsoft Outlook. Prevent 50GB file corruption, eliminate Outlook freezing, and divide PST files by size, year, date, or folder hierarchies.
PST File Loaded (48.6 GB)
Splitting Rule: Split PST by Size (10 GB chunks)
Output: 5 non-corrupted child PST archives
Hierarchy & Attachments: 100% Preserved
4 Flexible Ways to Break PST into Smaller Files
Whether you need to divide PST file archives by file size thresholds, chronological years, or department folders, our PST splitter tool provides granular control.
Split PST by Size
Divide large PST files into equal parts (e.g., 2GB, 5GB, 10GB, or custom MB/GB chunks). When the current child PST hits the threshold, the tool seamlessly creates the next segment.
Split PST by Date
Specify exact start and end dates to segment emails. All correspondence within the date window is neatly extracted into a dedicated, compact PST archive.
Split PST by Year
Generate distinct annual PST files (e.g., 2021.pst, 2022.pst, 2023.pst, 2024.pst). Ideal for corporate regulatory compliance, tax archiving, and historical backups.
Split PST by Folder
Divide PST file by folder hierarchy. Create dedicated child PSTs for Inbox, Sent Items, Drafts, Contacts, Calendars, or custom organizational project directories.
Preview Emails & Attachments Before Splitting
WindowsUtils is not just a high-speed PST splitter software; it also serves as a comprehensive PST viewer and PST file reader. Before you break PST into smaller files, open PST file archives to inspect email folders, read message bodies, and verify attachments without requiring Microsoft Outlook.
Key Performance Highlights
50GB+
Unicode PST Support
No 50GB file limit crashes or database lockups.
100%
Attachment Safety
All embedded attachments stay intact in child PSTs.
10x
Faster Than Outlook
Bypasses slow COM/MAPI messaging layers.
0%
Data Overwriting
Source archive remains in read-only protected mode.
Comparison: WindowsUtils vs Native Outlook Splitting
See why dedicated PST splitter software outperforms manual Outlook archiving and commercial alternatives like Kernel for PST Split.
| Feature / Capability | WindowsUtils PST File Splitter | Native Outlook Archive | Other Commercial Splitters |
|---|---|---|---|
| Split by Exact Size (e.g. 5GB) | Yes (Automatic Slicing) | No (Size Splitting Unsupported) | Supported |
| Outlook Client Dependency | Zero (100% Standalone) | Mandatory Active Installation | Often Requires MAPI Setup |
| 50GB+ File Stability | High-Throughput Multi-Threaded | Frequent Freezing / Lockups | Moderate Stability |
| Splitting Modes Available | 4 (Size, Date, Year, Folder) | 1 (Date Only via Archive) | 2-3 Modes |
| Orphaned & Detached Files | Full Support (Direct Binary Parsing) | Cannot Open Inactive Accounts | Supported |
| Pricing / Licensing | $12 Lifetime (Free Trial Available) | Bundled with Office License | $49 - $99+ Commercial |
Evaluating the Top 10 Best PST File Splitter Software Tools?
We benchmarked 10 top PST splitter utilities across speed, size thresholds, date filtering, and data integrity. Discover how each performs with 40GB+ archives.
Frequently Asked Questions About PST File Splitting
Common questions regarding oversized PST files, corruption prevention, and splitting options.
How to split a large PST file into smaller parts without Outlook?
To split large PST file archives without Outlook, download WindowsUtils PST File Splitter. Launch the software, click 'Add PST File' to select your oversized archive, choose your preferred splitting option (by Size, by Date, by Year, or by Folder), designate a target directory, and click 'Split'. The tool divides the file into smaller child PSTs while keeping 100% of emails, formatting, and attachments intact.
Can this PST splitter software divide oversized 50GB PST files?
Yes! WindowsUtils is an advanced large PST file splitter built specifically to handle massive 20GB, 35GB, and 50GB+ Unicode PST files from Outlook 2024, 2021, 2019, 2016, and 2013, as well as legacy 2GB ANSI PST files from older Outlook editions.
Does splitting a PST file delete or corrupt existing emails?
No. The software performs non-destructive read-only binary parsing. Your original source PST file remains 100% untouched. The generated child PST files preserve complete folder hierarchy, read/unread flags, message categories, calendar meetings, contacts, and embedded attachments.
What splitting criteria are available in this PST split tool?
You can divide PST files using 4 flexible criteria: 1) Split PST by Size (e.g., divide into 5GB, 10GB, or custom MB/GB chunks); 2) Split PST by Date (define specific start and end date ranges); 3) Split PST by Year (creates separate PST files for each calendar year); and 4) Split PST by Folder (creates dedicated PST files per mailbox folder such as Inbox, Sent Items, or Projects).
Can I preview and read emails with a built-in PST viewer before splitting?
Yes! WindowsUtils PST File Splitter includes an integrated PST viewer and PST file reader. You can open PST file archives, browse folders, view email headers, preview HTML formatting, and inspect attachments before initiating the splitting process.
Is there a free trial or PST splitter freeware demo available?
Yes! You can download the PST splitter free demo. The trial version allows you to test all splitting modes and splits up to 25 items per folder completely free of charge with no credit card required.
Split Oversized PST Files & Eliminate Outlook Lag Today
Safely divide large Outlook PST files into smaller parts by size, date, year, or folder with 100% data integrity and zero Outlook dependency.