Free OST to PST Converter

Automatic and multifunctional program to convert OST to PST with simple steps. Export Outlook mailbox from OST to PST files in a risk-free manner. Perform OST file recovery, OST conversion and OST to cloud migration with this single solution.

  • Free Convert Corrupt/Orphaned/Encrypted OST files..
  • Export every Outlook mailbox item from OST.
  • OST Conversion to PST and 12+ more file formats.
  • Migrate Outlook OST emails to any Cloud email program.

Demo Limit: - Free OST to PST software will convert OST up to 25 items from each selected folder for free.

Free OST to PST Conversion tool

Superior Key Attributes of Free OST to PST Converter Software

Free OST to PST Converter

Instant Fast Software Delivery via Email

30 days return policy

  • Most Powerful and Error-free solution to Recover/Convert OST to PST Outlook files.
  • Conversion with 2 different modes- Single OST File conversion & Bulk OST File Conversion.
  • Free OST file Recovery with Outlook items - email, contact, calendar, and other elements.
  • 12 more conversion formats besides PST to convert OST, which includes- EML, EMLX, MSG, HTML, MHTML, MBOX, vCard, ICS, CSV, TGZ, Thunderbird, etc.
  • Free OST Viewer solution that opens OST files to view all Outlook mailbox items independently.
  • Export data from OST files by selecting entire or some specific mailbox folders.
  • Mail filter to export only those emails that were generated on a specific date in the OST file.
  • Split PST option to break resulting large PST files into smaller parts based on size ranges.
  • Data Export from OST to New files while maintaining their originality.
  • Conversion of all types of Offline OST files - corrupt/ encrypted/ orphaned & healthy.
  • Get the power to Upload OST files to any cloud/web email program, including OST conversion
  • User-friendly interface to risk-free OST to PST Conversion execution with zero efforts.
  • OST Conversion without relying on MS Outlook or any additional software.
  • Compatibility of old to new versions of MS Outlook (up to 2021) and Windows (up to Win 11).

Demo version: Free conversion is limited to converting OST with only 25 items from each selected folder to available export options.

OST to PST Export Tool's More Features

Free OST to PST Conversion/ Recovery solution

A free solution for users who want to convert OST to PST files without spending money. The only software that allows to convert OST to PST and multiple other file formats like- PST, EML, EMLX, MSG, HTML, Thunderbird, and more.

Supports working with all types of OST files and easily recover Outlook mailboxes from inaccessible OST. Help to open OST files directly without MS Outlook requirements. Exports every Outlook mailbox item in its original form without any flaws.

Know complete process >> How to Convert OST to PST Free?

free ost to pst convert

Note: - This is a free demo of OST to PST Converter tool to test the working capabilities. It can convert OST with only 25 items from each chosen folder. For unlimited OST conversion without any restrictions, users can purchase any paid license of OST to PST Converter: - Buy Now at $29

convert single or multiple ost files

Single/Bulk OST Conversion

Convert a single or convert many OST files with the available 2 conversion options: -

  • Single OST File Conversion: - Convert one OST file at one time to PST or other available formats.
  • Bulk OST File Conversion: - in a single process perform conversion of multiple Outlook OST files.
Outlook OST recovery

Recover Outlook OST Mailbox

Recover Outlook mailbox items from inaccessible OST files and export them to readable PST files. Recover all Outlook mailbox items from OST including- emails, contacts, calendars, tasks, notes, journals and others with their originality.

Convert OST to multiple format

Conversion to 15 + file formats

Along with OST to PST conversion, many different file types are also offered in which you can convert OST files. Users can extract data from OST files and save them in formats like- EML, EMLX, MSG, HTML, MHTML, MBOX, vCard, ICS, CSV, Zimbra (TGZ) and Thunderbird Mail files.

open OST file

Open/Read Outlook OST files

Open OST file directly inside the software to check and read their internal mailbox data items. View a list of all available folders contained in the OST file and view their internal items in the preview panel. OST files open to read data in the software without the need for MS Outlook.

select/export OST folders

Export Only Chosen OST Folders

The software shows the internal folders of the OST file along with subfolders in hierarchical order. Select the desired folders from this list to export from OST file to PST. Easily a user can select some specific mailbox folders and export the data from those selected folders only.

email filter

Filtering Emails & Export Date-Wise

Extract only emails from OST files that are of a specific date. Use the mail filtering option to select email dates and export only them from the .ost file. Choose a start and end date and move emails that fall between that specified date range.

size pst by size

PST Splitting by Size Ranges

Choose the PST split function of the software to reduce the resulting PST file size. Split PST option will provide you with different size ranges (1GB, 2GB, 3GB, 4GB, 5GB to 25GB). Users just have to choose one of the sizes and they will get the resulting file of the selected size.

(For Example: - If the size of the resulting PST is 2GB, then the user will get 2 PST files of 1GB size each)

maintain data and folder structure

Complete Data Preservation

Not a single change will be made to the source OST file data by the software. Export/retrieve Outlook items with all their associated information from OST files to PST and other available conversion formats. This software exports every data item in every conversion format while maintaining its originality.

convert all OST

Conversion of all type OST

Convert all types of OST file including corrupt/ orphaned/ encrypted/ inaccessible/ offline as well as healthy. The software will convert each file with the same process and provide the results with accuracy.

ost to cloud migration

Outlook OST to Cloud Import

Export/upload data directly from OST file data to any cloud email app with easy steps. Export OST mailbox to Office365, Gmail, Yahoo Mail, and other IMAP-based web emailing programs.

smart GUI

Convenient Graphical Interface

OST to PST format conversion is easy because of the OST to PST Converter's intuitive graphical user interface. Usability is improved as users can convert files quickly and easily by navigating through menus, buttons and other visual features.

No Outlook need to convert ost to pst

Convert OST Without Outlook

It is a standalone solution for OST to PST conversion and does not even require MS Outlook application. Users can use this tool to convert OST in their Windows machine without the presence of Outlook or any other application.

Outlook/Windows support

All Outlook/Windows edition support

Software is specially designed to convert OST files that are generated from any MS Outlook version- 2000, 2003, 2007, 2010, 2013, 2016, 2019 and the latest 2021. Users can execute this tool on computers running any Windows version (up to Windows 11) without any hassle.

Software Comparison - Demo vs Full Version

Software Features Trial Version Full Version
Free OST to PST Conversion
Convert OST to all available conversion formats
Migrate OST to Cloud- Office365, Gmail, Yahoo Mail, & IMAP
OST file bulk conversion
Open OST & Read Outlook items
Email Filtering by date
Unlimited OST Conversion Convert OST with 25 items from each chosen folder to any conversion format
Download Now BuyNow ($29)

Software Specification

Trial Limitations

Free OST to PST conversion with 25 items from each folder of OST file.

Software Info


Version Support
PST & OST files of all MS Outlook editions

Personal, Corporate, Technician, & Enterprise

Language Supported
English, German, Italian, French, Spanish

System Requirements

Intel® Pentium Class

Operating System

Hard Disk Space
50 MB of free hard disk space

Minimum 512 MB is required

Software Delivery


Delivery by E-mail

Supported Editions

Works with all windows O/S editions 11, 10, 8.1, 8, 7, below editions

Frequently Asked Questions (FAQ)

  • Download & Lunch Windows-based Free OST to PST Converter tool by eSoftTools.
  • Choose single file conversion or bulk file conversion mode and add OST files.
  • Start Scanning OST files, repair OST file and load their inner folders/data items.
  • Preview Outlook items from OST file and choose the necessary folders.
  • Select a conversion format- Export to PST or Save all mailboxes in a single PST.
  • Apply additional required settings and hit the Convert button to Convert OST to PST.

Know complete process >> How to Convert OST to PST free?

Free OST to PST Converter software

Yes, users can convert one OST file as well as multiple OST files in a single process without any issue.

No, the software never makes any modifications to the source OST files while exporting data to PST files. Yes, and all the exported data will be saved in new PST files in the original format.


Yes, every Outlook item user can export from OST files to PST. Easily convert OST with emails, contacts, calendars and any other Outlook mailbox elements.

It depends on the size and number of OST files you are converting. While converting a single file of a smaller size will take less time, on other hand converting multiple large files at once may take more time.

Note: - Offers folder selection and mail filtering functions that users can easily implement to speed up the conversion process.

Yes, specifically a preview panel is offered that works to show all the data that is available in the OST file. Users can open OST files and see all data in this preview panel before executing the OST conversion process.

Yes, convert encrypted and password-protected OST files with no issues.

Yes, the software exports all the selected mailbox folders from OST files and preserves the folders in the new PST file keeping their correct order.

This demo version is only available for users to test the functionality and features of the software before purchasing. It will enable users to convert OST to PST for free up to 25 items from each folder without any charges.

Client Most Valuable Review's

(Rated 5 Star)
A year ago, I tried this software for OST to PST conversion. It has given the best results in converting OST files to PST format. Moreover, I have also tested it to convert OST to many other formats. All conversion tasks have been completed with no issues. Great utility.
[ Dawn Taylor ]  [ Australia ]
(Rated 5 Star)
I downloaded this free OST conversion software and used it to recover Outlook profile data from some orphan OST files. This tool did the work in a very short time. I got all my imported Outlook profile items in a working PST file. My advice to everyone is to use this software for successful results in OST conversion and recovery.
[ Danielle Green ]  [ Belgium ]
(Rated 5 Star)
I have been a user of Outlook for the last 5 years, but since last month I have been unable to access Outlook on my machine. Using this tool, I am opening OST files and reading data from them. This OST to PST converter has helped me a lot. Thanks, eSoftTools.
[ Don Plante ]  [ Canada ]