Is there a website or bookmarklet which given a URL will output a screenshot of that page?
Ideally there should be options to resize the outputted image.
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You can try Aviary
It's very simple: copy paste the url of the site and Aviary will load it up in its online image editor (see below)
They also have a Firefox addon and a bookmarklet, in which case it will fill in your current website for you (but on the same tab, so watch out!)
I wanted something which could capture screenshots of a local server, so a web service like Browsershots wasn't what I wanted.
Therefore, using html2canvas I've made a bookmarklet which captures a screenshot locally, rendering elements with a canvas.
To use it, copy this as a bookmarklet:
Then, click on it and possibly allow the pop-up it creates (the pop-up contains the screenshot).
For example, on Chrome you have to click on the right-most part of the address bar like so:
Then clicking on the link corresponding to the screenshot's pop-up to open it.
I know it's not a web app or bookmarklet, but what I use for this purpose is a Firefox plugin called Screengrab. I don't know if that's an option for you, but you can give it a try (if you're using Firefox, of course; and I'm sure there will be other similar ones for other browsers)
Try this software,a good piece of coding .
Just press PrintScreen on the keyboard -- a tool appears,and select the region of the screen shot, the image comes around !!
Check out the browshot API: https://browshot.com/api/documentation
You can specify any size for the thumbnail.
If you are looking for a wordpress plugin that will automate the job for you than "Simple Website Screenshot" does a fantastic job. You can specify the thumbnail size etc.
We use it on our own website (http://productivewebapps.com) if you'd like to see an example of it in use! (Disclaimer: I am the owner of this site)