You can now try to upload a PDF file to your WordPress website

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Many guides will tell you to add this code directly into your theme's functions.php file , but we don't recommend doing this because a small mistake can break your WordPress website and cause a variety of WordPress errors .

Instead, we recommend using the free WPCode plugin . It is the best code snippets plugin that allows you to add custom code in WordPress without breaking your WordPress website.

Note: There is also a premium WPCode plugin . While you don't need it for this tutorial, it gives you access to a cloud-based snippets library, conditional logic, and more. Check out our full WPCode review for more details .

First, you need to install and activate the free WPCode list of tongliao cell phone number plugin. For more details, see our guide on how to install a WordPress plugin .

Next, you need to go to “Code Snippets” + Add Snippet . Here you can hover over “Add your own code (new snippet)” and click “Use Snippet”.

Activate and save snippet in WPCodeThis code simply gives WordPress an empty array for the size of the PDF thumbnails and prevents WordPress from generating a preview of the thumbnails.

using the media uploader. You will notice that WordPress does not generate a thumbnail preview for your PDF file.

No thumbnail preview
We hope this guide helped you learn how to disable PDF preview in WordPress. You may also be interested in our list of the best code snippets for WordPress and our guide on how to easily add custom code in WordPress .