Convert PST to OST
Fast, free, and secure PST to OST conversion. No registration required.
Xonvert turns pst into ost using WebAssembly — the same technology that powers AAA browser games. Both PST Outlook Data and OST Offline Outlook are email formats, but they differ in approach: PST Outlook Data prioritizes complete Outlook data: emails, contacts, calendar and tasks while OST Offline Outlook focuses on enables offline Outlook access to Exchange/O365 email. Professionals in technology and engineering rely on this specific conversion regularly. The converter works offline too — once the page loads, you can convert without an internet connection.
PST vs OST: Why Convert?
There are strong reasons to convert PST to OST:
No vendor lock-in: OST Offline Outlook is widely adopted beyond Microsoft's ecosystem, giving you freedom to use any software you prefer.
Print shop acceptance: Professional print services commonly accept OST Offline Outlook, making this conversion essential for anyone preparing files for physical production.
Speed of delivery: OST Offline Outlook files maintain full quality while being optimized for efficient sharing.
Search engine benefits: For web content, OST Offline Outlook is widely recognized by search engines, potentially improving your content's discoverability.
Privacy advantage: Converting locally with Xonvert means sensitive PST Outlook Data files never leave your device during the OST Offline Outlook conversion.
No vendor lock-in: OST Offline Outlook is widely adopted beyond Microsoft's ecosystem, giving you freedom to use any software you prefer.
Print shop acceptance: Professional print services commonly accept OST Offline Outlook, making this conversion essential for anyone preparing files for physical production.
Speed of delivery: OST Offline Outlook files maintain full quality while being optimized for efficient sharing.
Search engine benefits: For web content, OST Offline Outlook is widely recognized by search engines, potentially improving your content's discoverability.
Privacy advantage: Converting locally with Xonvert means sensitive PST Outlook Data files never leave your device during the OST Offline Outlook conversion.
Comparing PST and OST Formats
| Feature | PST | OST |
|---|---|---|
| Full Name | PST Outlook Data | OST Offline Outlook |
| Category | ||
| Compression | Lossless | Lossless |
| Key Strength | complete Outlook data: emails, contacts, calendar and tasks | enables offline Outlook access to Exchange/O365 email |
| Key Weakness | proprietary Microsoft format, can become corrupted at large sizes | cannot be directly imported, tied to specific Outlook profile |
| Primary Use | Outlook email backup | Outlook offline mode and cached Exchange mailbox data |
| Developer | Microsoft | Microsoft |
| Year Released | 1997 | 2003 |
How Xonvert Converts PST to OST
Converting PST to OST with Xonvert is straightforward:
1. Choose your PST file — Click the upload button above or drag the file from any folder on your computer.
2. Confirm format — Xonvert automatically detects your source format and sets OST as the output target.
3. Tweak parameters — Use the advanced settings to control compression level, bitrate or resolution if you have specific requirements.
4. Export the result — Your OST file is generated in seconds. Click Download to save it locally.
1. Choose your PST file — Click the upload button above or drag the file from any folder on your computer.
2. Confirm format — Xonvert automatically detects your source format and sets OST as the output target.
3. Tweak parameters — Use the advanced settings to control compression level, bitrate or resolution if you have specific requirements.
4. Export the result — Your OST file is generated in seconds. Click Download to save it locally.
How OST Handles PST Data
Microsoft proprietary database format for Outlook desktop Offline cache of Exchange/Office 365 mailbox data These technical characteristics influence how quality is preserved during conversion. For email-to-email conversions, Xonvert applies format-aware algorithms that respect the unique characteristics of both PST Outlook Data and OST Offline Outlook. Converting within the same category means most properties transfer naturally. Document structure and formatting are preserved to the maximum extent supported by both formats.
Email format conversion from PST Outlook Data to OST Offline Outlook preserves message content, headers, attachments, and folder structure. MIME encoding, embedded images, and HTML body content are maintained. This is critical for email migration between different mail clients and servers.
The PST to OST conversion applies format-appropriate algorithms to ensure maximum data fidelity. Contains emails, contacts, calendar events, tasks and notes
Email format conversion from PST Outlook Data to OST Offline Outlook preserves message content, headers, attachments, and folder structure. MIME encoding, embedded images, and HTML body content are maintained. This is critical for email migration between different mail clients and servers.
The PST to OST conversion applies format-appropriate algorithms to ensure maximum data fidelity. Contains emails, contacts, calendar events, tasks and notes
Real-World PST to OST Applications
Common scenarios for PST to OST conversion:
• Web publishing — OST files are better optimized for websites, loading faster and using less bandwidth.
• Educational projects — Students and teachers often need OST format for assignments, papers, and learning materials requiring email content.
• Template creation — Build reusable OST templates from PST originals for recurring projects and workflows.
• Content repurposing — Transform your email content from PST into OST to reach audiences on different platforms.
• Client onboarding — When receiving PST files from clients, convert to OST to integrate smoothly into your internal workflow.
• Print preparation — Converting to OST may be necessary when submitting files to print services or publishers.
• Web publishing — OST files are better optimized for websites, loading faster and using less bandwidth.
• Educational projects — Students and teachers often need OST format for assignments, papers, and learning materials requiring email content.
• Template creation — Build reusable OST templates from PST originals for recurring projects and workflows.
• Content repurposing — Transform your email content from PST into OST to reach audiences on different platforms.
• Client onboarding — When receiving PST files from clients, convert to OST to integrate smoothly into your internal workflow.
• Print preparation — Converting to OST may be necessary when submitting files to print services or publishers.
PST to OST Conversion: Your Questions Answered
How is Xonvert different from other online converters?▼
Most online converters upload your files to their servers. Xonvert processes everything locally in your browser — your files never leave your device. It's faster, more private, and works offline.
Is there a file size limit?▼
There is no strict file size limit. However, very large files (over 500MB) may be limited by your device's available memory.
What are the advantages of OST over PST?▼
OST Offline Outlook offers enables offline Outlook access to Exchange/O365 email, while PST Outlook Data is known for complete Outlook data: emails, contacts, calendar and tasks. The best choice depends on your specific needs — compatibility, quality, or file size.
How does Xonvert compare to desktop software?▼
Xonvert offers comparable quality to desktop converters with the convenience of browser-based access. No installation, no updates, instant availability.
Is it safe to convert my PST files here?▼
Absolutely. Your files never leave your device — all processing happens in your browser using WebAssembly technology.
Is there an API for PST to OST conversion?▼
Xonvert is a browser-based tool without a server API, since all processing happens client-side. For automated conversion, you can use Xonvert's PRO features or integrate the underlying open-source libraries directly.
Are my files uploaded to a server?▼
No. Zero files are transmitted anywhere. Xonvert processes everything using client-side JavaScript and WebAssembly. Your files stay on your machine.