How to Make Vimeo Video Fill Entire Container Instead of Fitting Within It Using JavaScript API?

I’m trying to embed a Vimeo video using an iframe inside a wrapper container. I want the video to completely fill the container div regardless of what aspect ratio I set for that container. Basically, I need something similar to CSS object-fit: cover behavior but for iframe elements.

Right now when I change my browser window to different sizes and aspect ratios, the Vimeo video just gets contained within the viewport instead of covering or filling the entire available space. This leaves empty areas around the video which is not what I want.

Is there any special parameter or setting in Vimeo’s JavaScript API that can force the video to cover the full viewport area instead of being contained? I’ve tried various embed parameters but can’t seem to get the fill behavior I’m looking for.

Here’s what worked for me: put the iframe in a relatively positioned container, then make the iframe bigger than the container and center it. Set your wrapper to position: relative and overflow: hidden. Make the iframe position: absolute with top: 50%, left: 50%, and transform: translate(-50%, -50%). For sizing, figure out which axis needs to be bigger to fill the container completely. If your container’s wider than the video’s aspect ratio, set iframe width to 120% and height to auto. Otherwise flip it. You’ll probably need to tweak these percentages for your specific ratios. The trick is making the iframe oversized so it crops instead of getting letterboxed.

Vimeo’s iframe embed doesn’t have a direct equivalent to CSS object-fit: cover through their API parameters. The iframe always maintains the video’s aspect ratio by default. However, you can achieve this effect with CSS manipulation of the iframe container. Create a wrapper div with overflow: hidden and scale the iframe beyond 100% width/height using CSS transforms. You’ll need to calculate the scale factor based on your container dimensions versus the video’s aspect ratio. The trick is dynamically adjusting the iframe’s transform scale with JavaScript when the window resizes. This crops the video content to fill your container completely, though some video content may be lost at the edges depending on the aspect ratio mismatch.