How to get DOOM 3 to run in custom resolution (1920 x 1080)

Earlier this year I dusted of my copy of DOOM 3, remembering the nice graphics, but when I installed it the game didn’t support my graphics mode (1920 x 1080) So I tracked down a way to edit the custom mode so it would work.


Doom not running in correct resolution


Find the “DoomConfig.cfg” file found usually in:  C:\Program Files (x86)\DOOM 3\base.

Open the file and edit the following entires:

  • r_mode
  • r_customHeight
  • r_customWidth
  • r_aspectratio

And modify them as follows:

  • r_mode -1 – means putting into custom mode
  • r_customHeight 1080 – means custom resolution height
  • r_customWidth 1920 – means custom resolution width
  • r_aspectratio 1 – this changes the aspect ratio 0 is for a 4:3 display, 1 a 16:9 display (widescreen) and 2 a 16:10 display

They should look like this in the config file:

Doom config file

The aspect ratio is found near the bottom of the file. Then you can enjoy graphics like this:

Lovely jubbly!

For further reading on tweaking DOOM 3 I recommend:

Please note: If you change anything in the graphics options in game, then the custom settings will be lost and you will have to re-edit the cfg file.

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2 comments on “How to get DOOM 3 to run in custom resolution (1920 x 1080)

  1. Chris Parsons on said:

    Hi, I’m trying to edit the config file in my program files using notepad, but when I try to save the file, I get an “access denied” window, and there’s nothing more I can do. Can you help me? I need to get this game in the proper resolution, it’s getting proper annoying.

    I’m running Windows 7 64bit, and as far as I know I am the administrator, why is access being denied?


    • Hi Chris, I also use Windows 7 64 bit, you could try turning off the UAC in control panel. Go to: control panel/user accounts/change user account control settings (UAC) and set to Never notify. Also make sure you don’t edit the file while doom is running.

      Let me know how you get on.


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