Download Youtube video without any tool or website.

Steps to do:-

1. Go to the Youtube website and click the video you want to download.
2. At the top menu of browser go to View-Page source and click
or
You can directly press Cltr+U ( which will show the page source)
3. Open the page source and search "watch_fullscreen"
4. Copy the Url from "watch_fullscreen" till the end of line "&title"

for ex:-

watch_fullscreen?fs=1&q=elton%2520john%2520sacrifice%2520&BASE_YT_URL=
http%3A%2F%2Fin.youtube.com%2F&vq=None&sourceid=ys&video_id=KZvL2N0bXhE
&sw=0.05&l=287&sk=99kkGOCe4qbSVux023T0ZEgwi47thn2JC&fmt_map=&t=OEgsToPDs
kITmu47JG4VbV_mz-nj3T_z&hl=en&plid=AARVpRh9iPCWNuyyAAAAoAAoYAA&title

5. Open the new browser and type:-"www.youtube.com/get_video?"
6. Paste the copied Url to above address.......
7. Enjoy...
for ex:-www.youtube.com/get_video?
watch_fullscreen?fs=1&q=elton%2520john%2520sacrifice%2520&BASE_YT_URL=
http%3A%2F%2Fin.youtube.com%2F&vq=None&sourceid=ys&video_id=KZvL2N0bXhE
&sw=0.05&l=287&sk=99kkGOCe4qbSVux023T0ZEgwi47thn2JC&fmt_map=&t=OEgsToPDs
kITmu47JG4VbV_mz-nj3T_z&hl=en&plid=AARVpRh9iPCWNuyyAAAAoAAoYAA&title