RTF Viewer REST API, SDK & App for .NET | GroupDocs Viewer Cloud

GroupDocs.Viewer Cloud provides .NET developers with a robust suite of APIs to integrate advanced document viewing functionalities into their applications. Our free RTF Viewer REST API and SDK allow users to effortlessly view RTF images directly within their apps, eliminating the need for additional downloads or installations. Beyond RTF, our APIs support a wide range of formats, including Microsoft Office, AutoCAD, and more, ensuring versatility and broad compatibility for diverse application requirements.

In addition to our powerful APIs, GroupDocs.Viewer Cloud offers a free online RTF Viewer App that enables users to view and annotate RTF files directly from their browsers. This app requires no installation, making it perfect for quick document access and collaboration. Users can highlight text, add annotations, and share documents via email, streamlining workflows and enhancing productivity. Whether used independently or integrated into your application, our online app provides a flexible and efficient solution for document interaction.

Moreover, GroupDocs.Viewer Cloud supports multiple platforms beyond .NET. Python developers can take advantage of our comprehensive SDKs, complete with clear documentation and practical examples, to add RTF viewing capabilities to their projects seamlessly. The API Explorer feature allows developers to test and explore API functionalities directly in their browsers, offering an interactive way to understand and implement our solutions effectively.


  • View RTF Online via PHP or Free Online App
  • View RTF Online via cURL or Free Online App
  • View RTF Online via Node.js or Free Online App
  • View RTF Online via Python or Free Online App
  • View RTF Online via Android or Free Online App
  • View RTF Online via Java or Free Online App
  • View RTF Online via Ruby or Free Online App

.NET RTF Viewer REST APIs & SDK

View RTF and other Popular Formats for Free

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How to view RTF file online

  • Select the file by clicking the RTF App or simply drag & drop a RTF file.
  • Click the Open button to upload and view RTF file.
  • That is all! You can view your RTF document online.

Frequently Asked Questions

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

GroupDocs.Viewer Cloud Free Apps provide a convenient way to explore and test the document viewing capabilities before subscribing to a paid plan.

What features does GroupDocs.Viewer Cloud offer?

GroupDocs.Viewer Cloud provides various features, such as zooming, paging, searching within documents, text selection, and rendering options. You can render specific pages, generate document thumbnails, or even render documents as images.

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

GroupDocs offers technical support for Free Apps users to assist with any technical difficulties or inquiries related to the GroupDocs.Viewer Cloud platform.

Are there any limitations or usage restrictions with GroupDocs.Viewer Cloud?

GroupDocs.Viewer Cloud has certain usage limits depending on the subscription plan you choose. These limits may include the number of API requests, document size, or the number of concurrent connections. Its recommended to review the pricing and plans to understand the specific limitations.

I want to create my own app that can view RTF file online?

Check our Cloud SDKs at GitHub if you are looking for the source code to view RTF file format in the Cloud.

Is there a limit on the number of document views I can generate using GroupDocs.Viewer Cloud APIs?

GroupDocs.Viewer Cloud APIs offer flexible limits on the number of document views based on your subscription plan. Contact GroupDocs support for more details on view limits.

How can I integrate GroupDocs.Viewer Cloud into my application?

Integration is done through APIs provided by GroupDocs.Viewer Cloud. The service offers APIs for different programming languages and platforms, making it convenient for developers to incorporate document viewing capabilities into their applications or websites.

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

GroupDocs.Viewer Cloud Free Apps offer reliable performance and high-quality document viewing experience, ensuring smooth and seamless viewing of various file formats.

I do not want to upload my confidential RTF files anywhere? What are my options?

GroupDocs.Viewer Cloud is also available as Docker image which can be used to self-host the service. Or you may build your own services using GroupDocs.Viewer High-code APIs which currently drive both RTF Free Viewer App and REST APIs.

Can GroupDocs.Viewer Cloud Free Apps be used for commercial purposes?

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

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

GroupDocs.Viewer Cloud Free Apps may have restrictions on the number of document views, file types supported, or advanced functionalities compared to paid plans.

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

GroupDocs.Viewer Cloud APIs support a wide range of file formats including PDF, Word, Excel, and more.

Are there SDKs available for GroupDocs.Viewer Cloud APIs?

Yes, GroupDocs provides SDKs for various programming languages to simplify the integration and utilization of Viewer Cloud APIs in your applications.

How secure is the document viewing process in GroupDocs.Viewer Cloud?

GroupDocs.Viewer Cloud ensures a secure document viewing process with data encryption, secure protocols, and adherence to data protection standards.

What document formats does GroupDocs.Viewer Cloud support?

GroupDocs.Viewer Cloud supports a wide range of document formats, including PDF, Microsoft Word (DOC, DOCX), Excel (XLS, XLSX), PowerPoint (PPT, PPTX), images (JPEG, PNG, GIF, TIFF), and more.

Can I try RTF online viewer for free?

GroupDocs.Viewer Cloud App is completely free. You can view as many RTF and other files as you may like. If you are a developer and want to add this feature in your own app, you can try GroupDocs.Viewer Low-Code APIs without any limitations.

How can I access GroupDocs.Viewer Cloud Free Apps?

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

Rich Text Format File (RTF) Viewer REST API

View RTF with its attachments

View RTF and hundreds of other formats from CAD, Word, PowerPoint, Excel, Email & eBook

Rotate, reorder & watermark RTF pages

Get RTF document information like page & attachment count as well as properties

RTF REST APIs are secured and require authentication

View RTF as HTML5

View RTF as PDF

View RTF as Images like BMP, PNG, JPEG & TIFF

Text selection

Users can select, copy, and paste text directly from documents, making it easy to extract and use information from the content.

Wide range of document format support

GroupDocs.Viewer Cloud APIs and FREE Apps support a variety of document formats including PDF, Microsoft Office (Word, Excel, PowerPoint), AutoCAD, image files (PNG, JPEG), and more.

Free online RTF viewer supports over 186 file formats

The cloud-based viewer API for RTF has the ability to display different document formats quickly, with just a few lines of code. Using the SDK for .NET you can find out about the various document formats supported by the SDK.

Flexible Rendering of RTF Documents

GroupDocs.Viewer is a powerful document viewer REST API that allows you to display over 186 document formats in your applications. It allows rendering of RTF for the whole document, page by page or custom range of pages.

Integration capabilities

Developers can easily integrate the Viewer Cloud APIs into their applications to enable users to view documents directly within the application interface without the need to download them.

Minify RTF Output Content

One of the most exciting features of our Cloud-based viewer API for RTF is its ability to minify the output content. Minification removes comments, extra white-spaces, and other unneeded characters without breaking the content structure. As a result, the page becomes smaller in size and loads faster.

Printing support

Users can print documents directly from the viewer, enabling them to easily generate physical copies of the document content if needed.

GroupDocs.Viewer Cloud REST 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.

Free Alternative to Desktop & Mobile RTF Viewer Apps

GroupDocs.Viewer Cloud app does not need any installation or setup to view RTF. You can quickly start using the Viewer App in your browser to view any number of files per day absolutely free of charge.

Show or hide document headers and footers

GroupDocs.Viewer Cloud APIs supports rendering of headers and footers.

Extract document text while rendering in image mode

Our API allows extract text from documents

Zooming functionality

The Viewer Cloud APIs provide zooming capabilities, allowing users to zoom in and out of document pages to view content in more detail or from a broader perspective.

Render RTF files to remote FTP or Cloud storage

Use third-party cloud storage to save your RTF rendered files.

  • Amazon S3
  • Azure Storage
  • Google Cloud Storage
  • Google Drive
  • Dropbox
  • Box
  • FTP

Programmatically get list of supported file types.

Use our REST API to get list of 186 supported document types.

Page navigation

The APIs offer intuitive page navigation features that allow users to navigate through document pages easily and efficiently.

Free Apps support show or hide document comments

API Allows to view and comments embedded inside supported documents types.

Free Apps availability

Users can access and utilize FREE Apps for document viewing and annotation online, providing a convenient and cost-effective solution for accessing and interacting with document content.

Online document viewing

Users can view documents online without the hassle of downloading them first, providing a convenient and efficient way to access and interact with document content.

Self-host RTF Cloud Viewer Free App

The GroupDocs.Viewer Cloud Container Image enables users to self-host GroupDocs.Viewer Cloud for RTF using Docker.

Support and Learning Resources

Learning Resources

Product Support

Start Free Trial
Download GitHub Repository

View RTF using SDKs in other popular languages

View RTF Online via PHP or Free Online App GroupDocs.Viewer
Cloud SDK for PHP

View RTF Online via cURL or Free Online App GroupDocs.Viewer
Cloud for cURL

View RTF Online via Node.js or Free Online App GroupDocs.Viewer
Cloud SDK for Node.js

View RTF Online via Python or Free Online App GroupDocs.Viewer
Cloud SDK for Python

View RTF Online via Android or Free Online App GroupDocs.Viewer
Cloud SDK for Android

View RTF Online via Java or Free Online App GroupDocs.Viewer
Cloud SDK for Java

View RTF Online via Ruby or Free Online App GroupDocs.Viewer
Cloud SDK for Ruby

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