How To Make Youtube Embeded Videos Responsive

So you have hit the issue where you have a responsive website and everything looks great, but then you notice that embeded videos do not correctly fit within your responsive design. Fear not this can be quickly fixed by adding a div around all of your embeded videos and a little bit of css to go along with it. If you are using something like TinyMCE to do this, then it might seem like a lot of work to have to manually add a div to all of the embed videos that you add. Well fear not it’s possible to do this automatically!

Start by going to the plugins folder of your TinyMCE install directory. I am using TinyMCE 4 so the plugin file contents may differ if you are using an older version. Either way the concept will remain the same. Search through the file and look for he following string. “Paste your embed code below”. This may differ for each version, the best way to test is to use TinyMCE and see what message pops up when you are adding the embed code. Using minified code makes this quite hard to find, but it’s possible.

You will see an onclick method just past this. This is the function that you need to modify. Inside of this function you will see the following code


Replace this line of code with the following.

a.insertContent("<div class='videoiframe'>"+g(this.toJSON())+"</div>")

If you save the file and test this you will see that the iframe is now being added with the div wrapped around of it. (you might need to have the tools that allow you to view the source code to check this). From now on any embeded iframe from youtube or any other video website, will have a div wrapped around it. This allows you to add some custom css that will make the video responsive.

Open up your css file and add the following code.

.videoiframe {
float: none;
clear: both;
width: 100%;
position: relative;
padding-bottom: 56.25%;
padding-top: 25px;
height: 0;
.videoiframe iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;

Save this and check your website again, any videos that have the “videoiframe” div wrapped around it will be responsive. This of course wont effect existing videos that were added before you made this change to TinyMCE, but at least now you can go back and edit the posts to add the div to all of the embeded videos and they will now be responsive without having to do any work modifying the source code.

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