OST to PST Converter

Convert Outlook OST files to PST format online for free. Perfect for recovering emails from orphaned OST files.

Request Feature / Support

15,356+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

AI Web Tool Generator

Build Your Own Custom Web Calculator in Seconds

Type what tool or calculator you need below. Our AI will build it instantly for your site.

About This Tool

This OST to PST converter allows you to convert Outlook OST (Offline Storage Table) files to PST (Personal Storage Table) format directly in your browser. OST files are created by Microsoft Outlook when using Cached Exchange Mode or working offline, but they can become inaccessible if the Exchange account is removed. Our tool helps you recover emails, contacts, calendars, and other data by converting OST files to the standard PST format that can be imported into any Outlook installation. The conversion preserves folder structure, email metadata, and attachments.

Save your calculation history with a free account

How to Use

Click the upload area or drag & drop your OST file
Select your preferred PST format (Unicode or ANSI)
Choose whether to include attachments in the conversion
Click the 'Convert OST to PST' button
Wait for the conversion to complete
Download your converted PST file

Frequently Asked Questions

Find Quick Answers

What is the difference between OST and PST files?

OST (Offline Storage Table) files are local copies of Exchange mailbox data used for offline access in Outlook. PST (Personal Storage Table) files are standalone data files that can be moved between computers and imported into Outlook.

Will my email attachments be preserved in the conversion?

Yes, all email attachments are preserved during the OST to PST conversion process. You can choose to include or exclude attachments based on your needs.

What PST formats are supported?

The converter supports both Unicode PST format (for Outlook 2003 and later) and ANSI PST format (for older Outlook versions). Unicode format supports larger file sizes and international characters.

Is there a file size limit for conversion?

The tool can handle OST files up to 2GB in size. For larger files, consider splitting your OST file before conversion or using desktop software.

Is my data secure during conversion?

Yes, all file processing happens securely on our servers and uploaded files are automatically deleted after conversion. We do not store or access your email content.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

Related Tools

Other useful calculators and utilities you might like

Spotify to MP3 Converter

Convert Spotify tracks and playlists to MP3 format instantly with our free online converter.

Road Distance Calculator

Calculate the driving distance and travel time between two addresses with our free online road dista...

Age Calculator

Calculate your exact age in years, months, and days from any birth date to any target date.

Currency Converter

Convert currencies instantly with real-time exchange rates and historical data support.

Your Feedback Matters

Help Us to Improve