That's a pretty big jump, and pretty high. If I were you, I'd look at the site on a bunch of devices and make sure your ads aren't too close to other links or navigation. It sounds like you could be getting accidental clicks.

If you look at your stats (and maybe Analytics) you might be able to figure out which types of devices saw the increases. If it's all iPhones, for example, that may be what you want to look at.

You are fine. Unless you are a huge earner, the likelihood of being contacted by AdSense is very small. I know from doubling CTR overnight and 1+ years later have never been contacted. Same thing for the premium publisher site I manage as well.

I've quadrupled mine and not been contacted. Just watch out that you aren't attracting a ton of accidental clicks somehow, that's what (I have been told) caused my CPC to fall.

I would test extensively. I once had a huge jump in CTR caused by a minor changing I did not test properly making ads overlap content on one version of IE. Luckily, I spotted it fairly quickly.

I have a much higher CTR than that on many pages and have had for years. I asked a Google guy about it once, and he shrugged if off. As long as the clicks are legitimate, I wouldn't worry.

The thing that needs looking at (in my opinion) is not the CTR itself but the jump.

Evetything looks notmal, I tested on different browsers and it looks fine. No text overlap or ads close to the nav bar. Some articles suggest to make sites responsive and responsive adsense are better. But I still dont know and am not sure.

I noticed my adsense page CTR went from around 2% to 6-7%

Don't worry before you know it CTR will be back to 2%. Big g will take care of everything.

Thanks for all your feedback. After looking closer I found a few things that might have caused the increased CTR. It is back to normal now (so far).

I don't understand what is the point of having a responsive site. It makes pages so long. Are responsive sites really better? I have a travel guide site with lots of copy and since I don't sell anything but "adsense" I wonder if a responsive site a good idea or not and if would make any difference for adsense.

The point to having a responsive site is to make it easy for your users to consume your content on whatever device they are using to access it. It's for the users, not for AdSense. THE USERS.

I don't sell anything but "adsense" I wonder if a responsive site a good idea or not and if would make any difference for adsense.

My sites are not responsive, but I have little mobile traffic. I know that I will have to go that route eventually, but for now, my sites do quite well without being responsive. And the mobile traffic that I do have often meets or beats my desktop traffic's RPM.

netmeg, this is not what I meant. I agree THE USERS are the most important but as I said I don't sell anything and I have a great travel site with articles 1000+ words, so the only way to make money is through adsense. So all I was wondering is if responsive sites are better for adsense. My site looks fine on mobile just it is too small and true you have to tab on the screen to see the text larger but what is actually worse from a user perspective - to see the screen small and to have to tab on the area you want to read or to have to scroll many times to actually see what else is on the page?

My site looks fine on mobile just it is too small and true you have to tab on the screen to see the text larger

The point of responsive is that if people have to pinch and scroll, they are very likely to pinch and scroll the ads right off the screen. Hence, fewer clicks. At least that is how a Google person explained it to me.

Well how much of your traffic is mobile now? There's no one answer for every niche or every site. You have to think about user intent.

Many of my sites deal with events, and most of the traffic on these sites is mobile. People just want to know when and where the events are, and where to park, what else is going on, etc. I don't have much in the way of images, and my content is all short and easy to consume. So a responsive site makes sense for me, and in fact it's done very well with AdSense.

In your case, if you have really nice travel images, or posts with 1000+ words - a mobile device might not be the best way for users to consume your content. I have a large screen phone, and I would still find reading a post that long on my phone a little daunting.

If I were in your position, the first thing I would do is look at how much of my traffic is mobile, and what that mobile traffic is actually doing on my site - are they sticking around to see the content, or are they bouncing off immediately? Look at what your mobile users are actually doing, and you might have to adjust your content or your platform accordingly.