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OST to HTML converter

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

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By uploading your files or using our service you agree with our Terms of Service and Privacy Policy.

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

About Conversion app

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 HTML 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.

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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.

HTML

Hyper Text Markup Language

HTML is a standard markup language used to create and structure content on the web, enabling the display of text, images, links, and multimedia in web browsers. It can be edited using simple text editors like Notepad or specialized tools like Visual Studio Code, Adobe Dreamweaver, and online platforms such as CodePen. HTML files consist of elements defined by tags, which organize content into headings, paragraphs, lists, and more, while advanced features like forms, multimedia embedding, and integration with CSS and JavaScript enhance interactivity and design.

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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 HTML

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 HTML 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 HTML 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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