Free OST to XLS Conversion in .NET | Top REST APIs & Apps 2024

GroupDocs.Conversion Cloud is a reliable REST API designed specifically for .NET developers who need to convert Word documents (OST) to XLS effortlessly. With support for over 153 document and image formats, our API allows you to integrate powerful conversion capabilities into your applications without the need for additional software like Microsoft Office or Adobe Acrobat Reader. Whether you’re working on Windows, macOS, Linux, or any other platform, GroupDocs.Conversion Cloud ensures seamless and accurate document transformations anytime, anywhere.

Our API offers unparalleled flexibility, allowing you to customize your OST to XLS conversions to fit your specific requirements. You can choose to convert entire documents, select specific pages, or define custom page ranges. Additionally, you have control over the output quality and resolution, enabling you to produce high-quality XLS files tailored to your project’s standards. For added functionality, you can include watermarks or password-protect your XLS files to ensure document security and integrity.

Security is a top priority with GroupDocs.Conversion Cloud. Every conversion request is authenticated using a unique Client ID and Client Secret, ensuring that your data remains protected throughout the process. Our robust authentication mechanisms safeguard your documents, giving you peace of mind when handling sensitive information. You can trust that your OST to XLS conversions are handled securely and reliably, maintaining the confidentiality and integrity of your data.

Integrating GroupDocs.Conversion Cloud into your .NET applications is straightforward thanks to our comprehensive SDKs. Our .NET SDK provides clear and concise documentation, along with practical examples, making it easy for you to get started quickly. Whether you’re building a simple script or a complex application, our SDKs streamline the integration process, allowing you to add OST to XLS conversion functionality with minimal effort. Additionally, our API Explorer tool lets you test and experiment with the API directly in your browser, helping you understand its capabilities and how to implement them effectively.


  • Convert OST to XLS via Free App or Node.js
  • Convert OST to XLS via Free App or Android
  • Convert OST to XLS via Free App or PHP
  • Convert OST to XLS via Free App or Java
  • Convert OST to XLS via Free App or Python
  • Convert OST to XLS via Free App or Ruby
  • Convert OST to XLS via Free App or cURL

OST to XLS Conversion via .NET REST APIs

Free conversion Apps for Popular Formats

OST to DOC OST to DOCM OST to DOCX OST to DOT OST to DOTM OST to DOTX OST to RTF OST to ODT OST to OTT OST to TXT OST to MD OST to PDF OST to EPUB OST to XPS OST to TEX OST to PPT OST to PPS OST to PPTX OST to PPSX OST to ODP OST to OTP OST to POTX OST to POT OST to POTM OST to PPTM OST to PPSM OST to FODP OST to HTML OST to HTM OST to MHT OST to MHTML OST to XLS OST to XLSX OST to XLSM OST to XLSB OST to ODS OST to XLTX OST to XLT OST to XLTM OST to TSV OST to XLAM OST to CSV OST to FODS OST to DIF OST to SXC OST to TIFF OST to TIF OST to JPG OST to JPEG OST to PNG OST to GIF OST to BMP OST to ICO OST to PSD OST to WMF OST to EMF OST to DCM OST to DICOM OST to WEBP OST to SVG OST to JP2 OST to EMZ OST to WMZ OST to SVGZ OST to TGA OST to PSB OST to EML OST to EMLX OST to MSG

How to convert OST to XLS

  • Select the file by clicking the OST to XLS App or simply drag & drop a OST file.
  • Click the Convert button to upload OST and convert it to a XLS file.
  • Click on the Save button when it appears after successful OST to XLS format conversion.
  • That is all! You can use your converted XLS document as needed.

Frequently Asked Questions (FAQ)

How secure is the conversion process in GroupDocs.Conversion Cloud?

GroupDocs.Conversion Cloud ensures a secure conversion process by encrypting data in transit and at rest, and by following industry-standard security protocols.

What file formats are supported by GroupDocs.Conversion Cloud APIs?

GroupDocs.Conversion Cloud APIs support a wide range of file formats including Word, Excel, PDF, and more. Refer to the documentation for the full list of supported formats.

Is there a limit on the number of conversions I can perform using GroupDocs.Conversion Cloud APIs?

GroupDocs.Conversion Cloud APIs offer flexible conversion limits based on your subscription plan. Contact GroupDocs support for more information on conversion limits.

Are there any limitations to the features available in GroupDocs.Conversion Cloud Free Apps?

GroupDocs.Conversion Cloud Free Apps may have limitations on the number of conversions, file size, or output formats compared to the paid subscription plans.

Does GroupDocs provide support for technical issues related to GroupDocs.Conversion Cloud Free Apps?

GroupDocs offers technical support for Free Apps users to help resolve any issues or answer questions related to the GroupDocs.Conversion Cloud platform.

How reliable is the performance of GroupDocs.Conversion Cloud Free Apps?

GroupDocs.Conversion Cloud Free Apps offer reliable performance and high-quality output for your conversion needs, ensuring a seamless experience.

May I use GroupDocs.Conversion Cloud Free Apps for commercial purposes?

GroupDocs.Conversion Cloud Free Apps are primarily for evaluation and testing purposes. For commercial use, consider upgrading to a paid subscription plan for full features and support.

How can I access GroupDocs.Conversion Cloud Free Apps?

GroupDocs.Conversion Cloud Free Apps can be accessed directly from the GroupDocs website or through the GroupDocs web or mobile applications.

How can I integrate GroupDocs.Conversion Cloud APIs into my application?

Integrate GroupDocs.Conversion Cloud APIs seamlessly with your application by following the API documentation and integration guides provided on the GroupDocs website.

What are the benefits of using GroupDocs.Conversion Cloud Free Apps?

GroupDocs.Conversion Cloud Free Apps offer a convenient way to test and experience the conversion capabilities before committing to a subscription plan.

Are there any SDKs available for GroupDocs.Conversion Cloud APIs?

Yes, GroupDocs provides SDKs for various programming languages to help you easily integrate and use the Conversion Cloud APIs in your applications.

What OST to XLS Conversion API can do?

OST conversion API explorer based on swagger collection

Watermark OST pages

OST conversion APIs are secured and require authentication

Convert OST to XLS page by page or custom range of pages

Convert OST across all common formats

Password protect XLS output document

OCR Support

Benefit from Optical Character Recognition (OCR) to convert scanned documents into editable formats.

Batch Conversion

Convert multiple documents simultaneously for improved productivity.

Security and Authentication

The GroupDocs.Conversion Cloud API is secured and requires authentication. You need to register at GroupDocs Cloud and get the app access key ID (appSID) and app secret access key. Authenticated requests require a signature and AppSID query parameters or OAuth 2.0 authorization header.

Document Watermarking

Add watermarks to converted documents for branding or security purposes.

API Integration

Easily integrate conversion capabilities into your applications using APIs.

Scalable Performance

Efficiently convert large volumes of documents with high performance and reliability.

Document Metadata Preservation

Retain important metadata during the conversion process for better document management.

Configurable Conversion Options

Customize conversion settings such as conversion quality, page range, and more.

User-Friendly Interface

Intuitive interface for seamless navigation and operation.

API Explorer

The easiest way to try out GroupDocs.Conversion Cloud API right away in your browser is by using GroupDocs Cloud Web API explorer, which is a collection of Swagger documentation for the GroupDocs Cloud APIs.It allows you to effortlessly interact and try out every single operation our APIs exposes.

High-Quality Output

Maintain the quality of the converted documents with accurate formatting and layout.

Scheduled Conversions

Schedule conversions at a convenient time to optimize resource utilization.

Free online conversion Apps for OST

Convert unlimited documents and images using our Free online conversion Apps

Document Preview

Preview documents before conversion to ensure desired output.

Secure Conversion Process

Securely convert documents without exposing sensitive data to third parties.

Free Apps to Get Started and convert OST to XLS in No Time

With GroupDocs.Conversion Cloud API, you can start converting your files right away as there is no need to install anything. The API is clearly documented and comes with SDKs and live examples for all major languages. Our GroupDocs.Conversion SDKs along with working examples hosted at Github helps our users to get started in no time.

File Format Conversion

Convert documents between various file formats such as Word, Excel, PDF, and more.

Customizable Output Formats

Choose from a variety of output formats to meet specific needs.

Compliance and Security

Ensure compliance with data security regulations and industry standards.

Version Control

Maintain version control of documents through efficient conversion processes.

Comprehensive Documentation

Access detailed documentation and support resources for easy implementation.

Cloud-Based Solution

Access the conversion services from anywhere with internet connectivity.

Collaborative Workflows

Facilitate collaboration by converting documents for sharing and editing.

Free Apps to Convert OST to Multitude of Document Formats beside XLS

GroupDocs.Conversion REST API has the capability to perform document conversions on a number of document formats. It converts accurately making sure that the details are preserved while converting the document.

Support and Learning Resources

Convert OST to XLS using SDKs in other popular languages

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