Try using Catalyst Control Center (ATI) or the program that NVIDIA comes with, there should be a setting there

http://funk.eu/hrc/

I highly recommend this. Especially on a laptop you don't wanna be changing your resolution to anything smaller for 24/7 use. Just make sure in you nvidia or other driver settings you have it set for the resolution to stretch.

I've also been wanting to do this but I can't find the setting to do it in the Catalyst Control Center or the NVIDIA Control Panel.

i don't understand why people keep using stretched or non native resolutions

Unfortunately I use intel integrated b/c I'm on a latop. That be said I found that using Intel HD gfx control panel you can stretch it. Thanks anyway
i.imgur.com/fpqgiop.png

I used it a first because of my monitor. Now i do just because I like the way it looks (especially with Flatline's FlatHUD©™) and the fat character models.

I googled it and apparently in the NVIDIA Control Panel the scaling option should be under the "Adjust desktop size and position" tab. However, mine doesn't have that option and I have no idea why http://i.imgur.com/HQ7UInR.png?1?3439

alright but you're fov is narrower, don't you care about it?

It isn't on laptops iirc, are you on a laptop?

have you tried "-full -h 768 -w 1024" in your launch options, that seems to stretch it on my monitor for both tf2+cs.

Im on a desktop...

Scaling through the graphics drivers causes a frame of input lag and should be avoided if at all possible.

Do you mean that my fix (http://i.imgur.com/HQ7UInR.png?1?3439) would cause lag as well?

Try updating drivers, I had that too with Catalyst Control Center and updating drivers got the option for me

There are 2 ways to stretch your image.

1. Using your graphics card driver

2. Using your monitor to stretch, however, only some monitors have this ability.

When stretching, there will always be more input lag than using native non-stretched images in-game, due to the fact that the image must be rescaled after it's already been processed by the GPU.

For some reason no one knows, when stretching with your GPU, it reduces fps (due to post process, it will consume some of the power that would be allocated to other stuff, aka your game) as well as adding more input lag compared to stretching with your monitor.

Reasons why you would stretch:
On the BenQ XL2411 series (g z t x) when using the resolution 1280x960 (4:3) it recognises the resolution as 1280x1024 and it will actually narrow the image down since 5:4 is narrower than 4:3. Stretching will "fix" that.

Wider models

Don't like black bars (bit racist though)