Ever wanted to download your favorite YouTube videos right onto your iDevice for buffer-free and even offline viewing? But are you still in the dark about what you need to carry it out, short of jailbreaking your iDevice? Wonder no more as an app called Hi Download Pro might just be the thing to do it.

Hi Download Pro, which has just been updated with several minor improvements, is an app that is capable of downloading Web videos.

As enumerated in the app’s description in the App Store, Hi Download Pro supports downloading videos from: YouTube, Vimeo, DailyMotion, Veoh, Tudou, DaumTV, Naver, 56, x17video, 4shared, aniboom, blinkx, blip, break, buzznet, engagemedia, godtube, liveleak, metacafe, sapo, vbox7, and more.

I don’t know most of the aforementioned channels. But I think it’s safe to assume that most of us are likely to concern ourselves with videos from the first three sites: YouTube, Vimeo, and DailyMotion.

I tried downloading a video from each of these three sites and succeeded in all three attempts.

Hi Download Pro

But how do you download a video with Hi Download Pro anyway? It’s actually quite simple.

First, you use the in-app browser to navigate to and play your desired video. Shortly after playing it, you will be prompted to download the video and specify a title for it. The download process is automatically initiated once you tap the download button.

You can continue watching the video while the download is in progress. Or you can just stop and wait for your download to finish, so that you can watch the video later on sans any buffering interruptions.

Designed for both iPhone and iPad, Hi Download Pro is available in the App Store for $3.99. A free version of the app, called Hi Download Plus, is also available, but it’s limited to 10 downloads only.

Download either version of the app now while you can. YouTube, for one, apparently prohibits downloading videos from its servers. So there’s a lurking possibility that the app might be pulled out or its functionality be limited soon enough.