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Convert OST files online instantly, no sign-up required. You can convert your OST documents on any platform—Windows, Linux, or macOS. Upload your file, choose the output format, and press convert. When the process is done, your PDF file will be ready for download.
The OST file's size and structure affect conversion time, though most files are processed in seconds. Advanced features allow you to convert password-protected documents and receive conversion results via email.
No matter where you are, convert your OST documents seamlessly on any device, including smartphones. Available online anytime, this conversion app is completely free for basic scenarios.
Check our videoAn OST (Outlook Offline Data File) is a file format used by Microsoft Outlook to store a synchronized copy of mailbox data locally, enabling offline access to emails, calendars, contacts, and other items. It is primarily used by Microsoft Outlook and can be accessed or converted using tools like Kernel OST to PST Converter, Stellar Converter for OST, and SysTools OST Viewer. The OST file structure is based on the Messaging Application Programming Interface (MAPI) and supports advanced features like synchronization with Exchange Server, encryption, and data compression for efficient storage and security.
PDF is a widely used file format developed by Adobe to present documents consistently across different devices and platforms. It can be opened and edited using applications like Adobe Acrobat, Foxit Reader, or web-based tools, and supports text, images, and interactive elements. The format is structured as a combination of vector graphics, raster images, and text, with advanced features such as encryption, digital signatures, annotations, and form fields for enhanced functionality.
You can also convert OST into many other file formats. Please see the complete list below.