If you jailbreak your iPhone or iPad then you can do it easily. If not, you can follow the below steps to download videos to your iPhone and iPad for free. Step 1: Open the YouTube app and find the video that you want to download Step 2: Play the video and tap on the "Share" button. Step 3: Tap on "Copy" from the share menu. Step 4: Now, install the free "Documents by Readdle" app on your iPhone Step 5: Open Documents by Readdle app then tap the web browser icon in the lower right corner of the application. Then enter any online YouTube video converter of your choice and press "Go" Step 6: Paste YouTube video URL you want to download into the search box and press the "Submit" button. Step 7: Select the video / MP3 format you want to download and press the "Download" button.