How to simulate a higher resolution screen? [closed]
[Edit: Check your browser's devtools first! As @SkylarIttner points out in the comments, tools for responsive design testing have been rolled out since in most browsers since the below solution was posted. They are likely the best/easiest option now.]
You could, correct me if I'm wrong, simply create an iframe with style="desired width & height" and src="your/test.site" as the only child of <body>. Should display the site as if the resolution was the specified width/height and result in scroll bars to examine it.
Not as convenient as using a third party, having to set it up yourself, but has the advantage of being able to test locally with no internet connection.
This solution is way faster than the ones proposed above:
http://www.infobyip.com/testwebsiteresolution.php
It's not as versatile as browsershots.org but it's much faster (a few seconds v. a 45 minute queue).
Some ideas:
Use browser zoom, 1024x768 50% zoom = 2048x1536 simulated resolution, I know Chrome resizes images and the like. Things become hard to read, but I'm assuming you're testing placement and such.
Also you can use some screenshot programs to take higher than normal resolution screenshots (fireshot on Firefox let me do this, but had memory issues with really high resolutions, and isn't free anymore).