Groupdocs logo
  1. GroupDocs Products
  2. Conversion App
  3. Convert OST to ICO

OST to ICO converter

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

Powered by groupdocs.com and groupdocs.cloud.

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 ICO 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 video
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.

ICO

Microsoft Icon File

The ICO (Icon File) format is a widely used image file format primarily designed for storing computer icons in Microsoft Windows operating systems. It is supported by various graphic editing tools like Adobe Photoshop, GIMP, and online converters, as well as being natively compatible with Windows for displaying application and system icons. The format can store multiple images of varying sizes and color depths (up to 32-bit RGBA) within a single file, allowing for high-quality, scalable icons with transparency and anti-aliasing support.

Api cloud icon

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.

Learn more
How it works

How to convert OST to ICO

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 ICO 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 ICO 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.

© Aspose Pty Ltd 2001-2025. All Rights Reserved.
More apps

Upgrade to Premium

The application usage limit reached.
Upgrade for extended access, starting at $4/month.
Upgrade Learn more