How do I Encode an Image in Base64 for Firefox/IE Add-ons?

Base64 Encoding an Image for Firefox/IE Add-on

When creating an open search add-on for Firefox or Internet Explorer, the image needs to be Base64 encoded. This article provides methods to encode an image using Base64.

Using an Online Tool

• Visit a website that provides Base64 encoding, such as [Base64 Encode/Decode](https://www.base64encode.org/).
• Upload the favicon image or copy and paste its URL.
• The encoded Base64 data will be displayed. Copy the output.

Using PHP

If you are familiar with PHP, you can perform Base64 encoding using the following steps:

<code class="php"><?php
    $im = file_get_contents('filename.gif');
    $imdata = base64_encode($im);      
?> </code>

Examples of Icon Element Usage

In OpenSearch plugins, the icon element is used to specify the image. Here is an example:

<img width="16" height="16" src="data:image/x-icon;base64,imageData">

Replace "imageData" with your Base64 encoded data.

Additional Resources

• [Mozilla's Guide to Creating OpenSearch Plugins](https://developer.mozilla.org/en-US/docs/Search/Creating_OpenSearch_plugins)

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