Convert OST to PST Online — Free & Fast | AnyConv

OST to PST Converter

Quickly convert multiple ost files to pst — free & online.

Drag & drop your files here or click to upload

How to convert OST to PST online

Follow these simple steps to convert ost files to pst using AnyConv. It works on all devices — Windows, Mac, Linux, iPhone, Android.

Upload your OST file

Drag & drop your file into the upload area. You can also click to select it manually. Max file size: 100 MB.

Start converting

Hit the “Convert” button to turn your OST into PST. The process usually takes just a few seconds.

Download your PST

Once ready, download your converted file instantly. The download link is private and only works on your device.

What is a OST file?

OST (Offline Storage Table) is a file format used by Microsoft Outlook to store mailbox data locally when using an Exchange, Office 365, or Outlook.com account. It allows users to work offline and sync changes once reconnected.

OST files include emails, contacts, calendar events, and other mailbox items. They are created automatically and typically don't require manual access, but can be converted to PST for backup or migration.

How to open OST files

OST files are used internally by Microsoft Outlook and are not designed for direct access. They are created automatically when configuring Exchange or Office 365 accounts.

To extract or view data from an OST file, use Outlook with the original account or convert it to PST using AnyConv or a specialized recovery tool.

Key facts about OST

  • Full name: Offline Storage Table
  • Extension: .ost
  • MIME type: application/vnd.ms-outlook
  • Developed by: Microsoft
  • Initial release: 1997

Useful links and resources

What is a PST file?

PST (Personal Storage Table) is a file format used by Microsoft Outlook to store email messages, calendar events, contacts, and other personal information. It’s commonly used for email archiving and backup.

PST files can grow large and are stored locally, making them ideal for offline access or transferring Outlook data between systems.

How to open PST files

PST files can be opened using Microsoft Outlook. They can be imported or archived to access emails, calendars, and contacts offline.

Convert PST to EML, MBOX, or CSV using AnyConv or dedicated email export tools.

Key facts about PST

  • Full name: Personal Storage Table
  • Extension: .pst
  • MIME type: application/vnd.ms-outlook
  • Developed by: Microsoft
  • Initial release: 1997

Useful links and resources

Convert from OST

Need to change your OST files to a different format? Below are all the available tools to help you turn OST into the format you need.

Convert to PST

Want to get a file in PST format? Choose the original format you’re starting with — AnyConv can quickly convert dozens of file types into PST.

❓ Frequently Asked Questions

Answers to common questions about converting OST to PST
  • Do I need to register to convert OST files?
    Not at all! You can convert OST to PST without signing up or installing anything.
  • Is it safe to convert OST to PST on AnyConv?
    Absolutely. All OST and PST files are securely handled and automatically deleted after 1 hour. Nobody can access your data.
  • Will the quality change after converting OST to PST?
    We do our best to preserve the original quality during OST to PST conversion. The result is accurate and clean.
  • How long does it take to convert OST to PST?
    Most conversions from OST to PST take just a few seconds — even for larger files.
  • Can I upload more than one OST file?
    Yes, batch conversion is supported. You can convert multiple OST files to PST at once — fast and easy.
  • What browsers support OST to PST conversion?
    All modern browsers! Chrome, Firefox, Safari, Edge — AnyConv runs online and supports converting OST to PST on any platform.