Jailbreak iOS 7 using iphone 4?

Is it possible that i could jailbreak my iphone 4 using a website on the safari app without using a comp?

There's is no such thing for ios 7. Only way to jailbreak ios 7-7.0.4 is from the a computer.

I don't think so and if there's it is most likely a hoax, the best and safest way is to go to http://evasi0n.com/ and download the jailbreak, i used it for my iPad mini and it works great, i would also recommend backing up your iPhone before unless something were to happen via iTunes. I have tried some of the jailbreaks via safari and all the ones i tried forced me to do surveys or give my email which turns out to be a hoax every time. I'm sorry that i could not find a jailbreak to get thorough safari but i hope you try the evasion jailbreak.

No, you need a computer to download the jailbreak tool to jailbreak your iPhone. It is not that simple or difficult, but you need a pc anyhow.

Here is a tutorial about how to do it.
http://www.syncios.com/blog/how-to-jailbreak-ios-7-using-evasi0n7-on-ipad-iphone-and-ipod-touch-5g/