CHM Viewer - Read Compiled HTML Help on Android

A CHM file is a Microsoft Compiled HTML Help File: a whole manual - topic pages, table of contents and index - built into one compact file. Windows has shipped a reader for it since the late 1990s, which is precisely the problem on a phone. Android has no built-in CHM reader, so a manual or e-book sent to you will not open.

The free online GroupDocs.Viewer app answers that directly. Open it in an Android browser, upload the help file, and read the topics as ordinary pages, with page navigation, thumbnails and zoom. There is nothing to install.

Developers who need CHM support inside a mobile product can call GroupDocs.Viewer Cloud instead. Help files are rendered as JPG, PNG, PDF or HTML, page by page or as a whole, and the Java SDK with its sample code drops into a Gradle or Maven build. A legacy Windows archive then becomes content a modern app can present.

CHM is one of over 180 supported formats, so one integration also opens PDF, DOCX and other documentation. Real help files can be tested during a free trial or through the API Explorer.


  • View CHM Online via PHP
  • View CHM Online via Ruby
  • View CHM Online via cURL
  • View CHM Online via Node.js
  • View CHM Online via Python
  • View CHM Online via Java
  • View CHM Online via Go
  • View CHM Online via .NET

CHM Viewer - Read Compiled HTML Help on Android

View CHM and other Popular Formats for Free

DOCPPTXPLSMLEPUB7ZERBPSD1PPSPPSMPCLBATAIOTGVDXCMXJPEGSASSPROPERTIESRSTMBOXHHONESHVCFCF2FODGGZPSXLSXPSTMOBISCRIPTMPDFDWTDXFDOTPPSXVBPOTPOTMCSVFODSXPSTAR.XZTSVJ2CPNGOTTMPPFODPEMLXNSFVSDXPSBMHTBMPEMFMDVSSXVSDMODPDWGSVGZCDOCXHCSSICOSCMTIFFTGZTEXHAMLVSTXHTMLVSXODTOXPSDOCMLESSJ2KOSTXLTXLSCDRCXXGIFPOTXAS3JSODGDNGASMPHPCCBZ2JPGCPPCSWMZTAR.GZPYRARVDWVIMMAKEVSSWMFJAVAHTMMSGXZDGNXLSMNUMBERSVSTSTLODSASPSM1PLTJSONDJVURTFMPTJPFMHTMLTXZGROOVYVTXEPSTXTOTSIGSJPCXLSBEMLWEBPVSDHPGAPNGEMZSQLOTPLOGMPXMLYAMLTGASCALAIFCDOTXDIFFSXCPSDOBJVSSMCGMJPXRBDCMPPTMXLTMTARZIPXLAMSVGTIFXLTXJLSJPMGZIPMMPPTDWFJP2XML

How to view CHM file online

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

Frequently Asked Questions

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.

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.

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

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

How is CHM support added to an Android application?

Through the GroupDocs.Viewer Cloud Java SDK, declared in Gradle or Maven. Upload the help file, request a rendering, and the topics return as PDF, HTML, JPG or PNG pages your app can present.

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.

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.

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.

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.

Microsoft Compiled HTML Help File (CHM) Viewer REST API

Rotate, reorder & watermark CHM pages

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

Render CHM files using a single API call

View CHM as HTML5

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

View CHM as PDF

View CHM with its attachments

CHM REST APIs are secured and require authentication

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

Minify CHM Output Content

One of the most exciting features of our Cloud-based viewer API for CHM 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.

Show or hide document headers and footers

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

Free Alternative to Desktop & Mobile CHM Viewer Apps

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

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.

Free online CHM viewer supports over 186 file formats

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

Extract document text while rendering in image mode

Our API allows extract text from documents

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.

Flexible Rendering of CHM 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 CHM for the whole document, page by page or custom range of pages.

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.

Text selection

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

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.

Self-host CHM Cloud Viewer Free App

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

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.

Render CHM files to remote FTP or Cloud storage

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

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

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.

Printing support

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

Programmatically get list of supported file types.

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

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.

Support and Learning Resources

Learning Resources

Product Support

Start Free Trial
Download GitHub Repository

View CHM using SDKs in other popular languages

View CHM Online via PHP GroupDocs.Viewer
Cloud SDK for PHP

View CHM Online via Ruby GroupDocs.Viewer
Cloud SDK for Ruby

View CHM Online via cURL GroupDocs.Viewer
Cloud for cURL

View CHM Online via Node.js GroupDocs.Viewer
Cloud SDK for Node.js

View CHM Online via Python GroupDocs.Viewer
Cloud SDK for Python

View CHM Online via Java GroupDocs.Viewer
Cloud SDK for Java

View CHM Online via Go GroupDocs.Viewer
Cloud SDK for Go

View CHM Online via .NET GroupDocs.Viewer
Cloud SDK for .NET

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