Fully Responsive Free MP3 MP4 Converter API Iframe Code:

<iframe src="https://yt-mp3s.com/zB4I68XVPzQ" width="100%" scrolling="auto" style="border:none;">

The above code will generate following block:

YT 2 MP3 Api Block

MP3 Download Formats Block:

MP3 Download Formats Block

MP4 Download Multiple Formats Block:

MP4 Download Multiple Formats Block