GroupDocs.Conversion Cloud for .NET and Free Apps have been developed to help you get started with Document Conversion REST API. It not only allows you to convert between Excel Open XML Spreadsheet Template (XLTX) & Excel Spreadsheet (XLS) file formats but over 153 types of documents from Microsoft Office, OpenDocument, Adobe, AutoCAD, PDF, image and many other popular categories.
GroupDocs.Conversion Cloud App is completely free. You can convert as many XLTX files to XLS as you may like. If you are a developer and want to integrate this feature in your own app, you can try GroupDocs.Conversion Low-Code APIs without any limitations.
Check our SDKs at GitHub if you are looking for the source code to convert XLTX file format to XLS in the Cloud.
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.
Convert unlimited documents and images using our Free online conversion Apps
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.
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.
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.