A Guide to Uploading Custom File Types on WordPress: A Code Implementation

WordPress is a versatile platform that powers a significant portion of the internet. While it comes equipped to handle various file types, there are times when you may need to extend its capabilities to accommodate custom formats. In this blog post, we'll explore how to upload custom file types to WordPress using a simple code snippet.

Custom File Types in WordPress

By default, WordPress restricts the types of files that users can upload to the media library for security reasons. However, there are scenarios where you may need to upload specialized file formats, such as Adobe Illustrator files (ai), Adobe InDesign files (indd), or even embroidery files like ofm and dst.

The Code Implementation

To enable WordPress to accept these custom file types, you can use a code snippet. Place the following code in your theme's functions.php file or in a custom plugin:

//Upload Custom File Types
function my_custom_mime_types($mimes)
    $mimes['ai'] = 'application/postscript'; //Adobe Illustrator
    $mimes['indd'] = 'application/postscript'; // Adobe InDesign
    $mimes['ofm'] = 'application/postscript'; // Embroidery
    $mimes['dst'] = 'application/postscript'; // Embroidery
    return $mimes;
add_filter('upload_mimes', 'my_custom_mime_types');

This code uses the upload_mimes filter to add additional MIME types to the list of allowed file types. It associates the custom file extensions with the appropriate MIME types, ensuring that WordPress recognizes and accepts them.

Be Careful What File Types You Are Allowing

While extending WordPress to accept custom file types can be useful, it's crucial to exercise caution. Allowing additional file types can introduce security risks if not handled properly. Here are some precautions to take:

Only allow file types that are absolutely necessary for your website's functionality. Avoid enabling overly broad permissions, as this might expose your site to potential security vulnerabilities.


In this blog post, we've explored the process of uploading custom file types to WordPress using a simple code snippet. While this customization can enhance the flexibility of your site, it's essential to approach it with caution. By being mindful of the file types you permit and understanding the potential security implications, you can strike a balance between functionality and safeguarding your WordPress website.

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