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OST to HTM converter

Convert OST to HTM online from any device with a free converter.

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We have already processed 8,914 files with total size of 18,799 Mbytes

About Conversion app

Easily convert your OST files online with no registration required. Convert your OST documents from Windows, Linux, or macOS. Simply drag and drop your file into the upload form, select the desired output format, and click the convert button. Once the conversion is complete, you can download your HTM file.

Depending on the OST file's size and format, conversion may take a few moments, but most files convert quickly. With advanced features, you can convert password-protected documents and have the results sent to your email.

Convert your OST documents anytime, anywhere, on any device—including mobile. Use this conversion app online 24/7—free for basic conversions.

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OST

Outlook Offline Storage File

An 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.

HTM

Hypertext Markup Language File

HTM is a file format used to create and structure content for web pages, defining elements like text, images, and links. It can be opened and edited using text editors like Notepad or specialized tools like Visual Studio Code, Adobe Dreamweaver, or web browsers for rendering. The format uses tags enclosed in angle brackets to define elements, supports CSS for styling, JavaScript for interactivity, and can include multimedia, making it the foundation of modern web development.

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APIs available

Convert popular document and image file formats in your app. The GroupDocs.Conversion APIs are available for .NET, Java, and many other platforms and languages.

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How it works

How to convert OST to HTM

Step 1
Click inside the file drop area to upload OST file or drag & drop OST file.
Step 2
Click on Convert button. Your OST files will be uploaded and converted to HTM result format.
Step 3
Download link of result files will be available instantly after conversion.
Step 4
You can also send a link to the HTM file to your email address.
FAQ

Questions & Answers

Other Supported Conversions

You can also convert OST into many other file formats. Please see the complete list below.

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