you can download youtube videos with out any downloader or any software.

Its simple

• just select the video you like.
• In addres box type "SS" after www.
• It will redirect to another page and you can download in any format.

for example

• If you want to download Krish 3 trailor.
• Goto search box in youtube type krrish 3.
• you will get results.
• Now click on the video you want to download.
• now see the URL of the page that will appear in address box above.
• you see this address https://www.youtube.com/watch?v=MCCVVgtI5xU.
• remove "https".
• now add "SS".
• Like this www.ssyoutube.com/watch?v=MCCVVgtI5xU.
• succes here your download in any format.
• Its free and safe.