Download YouTube videos as MP3 files by using online resources such as ClipConverter.cc, YouTube-MP3.org and MP3Fiber.com, as of June 2015. These resources convert the videos into MP3 files.
At YouTube-MP3.org, paste the video URL into the field provided, and then click on the Convert Video button. If the conversion process is successful, a message confirming successful conversion of the video to MP3 format along with a download link displays on the screen. Click on the download link to download the MP3 file.
At ClipConverter.cc, paste the URL of the YouTube video you wish to convert into the field provided, and then click on Continue. From the available audio formats, such as MP3, AAC and M4A, choose the MP3 option, and then click the Start button for conversion to begin. After the conversion, which may take several minutes, click on the Download button to download the MP3 file.
At MP3Fiber.com, paste the URL of the YouTube video into the provided field, choose the MP3 quality you desire, and then click on Download to download the MP3 file.
In addition, you can convert an already downloaded YouTube video into an MP3 file by using an offline application such as the YTD Video Downloader.