Chrome extension

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Source code
The source code for the  Chrome extension is available in the S4 GitHub repository.



The Chrome extension for S4 provides an easy way for testing the S4 text analytics services directly from the browser. After installing the extension, the user should configure it by specifying his private API key/secret pair and the choosing the specific S4 text analytics service to be used for the web page annotation.

The source code for the add-on is available from the S4 GitHub repository.


The add-on can be installed from the Chrome Web Store.


  • The browser extension works with recent versions (v.30 +) of the Chrome web browser
  • the user needs to authenticate with his private S4 API key/secret pair, which can be generated via the S4 Management Console at

Installing from the Chrome Web Store

The extension is available from Chrome Web Store at

Follow the standard installation steps for Chrome extensions:


Before the S4 extension can be used, the user has to perform the required configuration, namely to specify the credentials (API key/secret) to be used for accessing the S4 services.

API key/secret pairs can be be generated via the S4 Management Console at

Upon activating the S4 extension for the first time (by clicking on the "S4" icon in the toolbar), the following configuration dialog will appear:

The user should provide a valid API key/secret pair and choose the default S4 text analytics service to be used for web page annotation. The API key/secret pair as well as the S4 text analytics service can be changed at any time by activating the S4 extension again:

Using the Add-on

Any time the browser has loaded a web page the user can select some text snippet on the page and activate the context menu (right click). "Annotate Selection with S4" should appear on the context menu:

After the text snippet is sent to S4 for processing the following pop-up will show the results from the text annotation process: 

An example for using the Firefox add-on for S4 on a bio-medical document looks like: 

The description of the annotation results of the different text analytics services is available as follows:

Uninstalling the extension

The S4 extension can be uninstalled at any time from the "Extension" tab of Chrome.

Next Steps

The S4 extension for Chrome provides an easy way for developers and language engineers to test the S4 text analytics results directly from the Chrome browser. If you haven't done so already - register and start using S4 right away!

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