I want to know about it is possible, i make changes in Google adsense ads code ( In size of Ads) hight and width as per my website design. For Example i am select ads Format 728X90 and generate code and paste in website but then i want to Change ads original size from 728X90 to 468X90. this possible and its working, google give permission to change ads format.
You really should search the AdSense help section and find your answer. I wouldn't even trust any advice on this forum but get the information straight from the horse's mouth. https://support.google.com/adsense/answer/1354736?hl=en
Regardless of peoples opinions of this forum, it is not worth doing anything your not sure about that could cause you to lose your account. When in doubt just don't do it. Following this advice has kept my account in good standings for years.