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I know I can set the render border with Ctrl+B and dragging a box. But is there a way I can exactly specify the border dimensions?

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You can access the render border values via the outliner if you change its display mode to 'Datablocks':

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You can then navigate through the tree structure of the outliner to the border values via Scenes> Scene (may be different depending on the name of your actual scene)> Render Data:

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The border values can be set from 0-1, so unfortunately you can't set exact pixel coordinates without some maths. 0 is the left side of the camera and 1 is the right side of the camera for the 'x' values (or the bottom and top sides of the camera for the 'y' values).

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  • $\begingroup$ Perfect, that's exactly what I was looking for. I actually prefer this way as opposed to pixel coords. $\endgroup$
    – PGmath
    Jan 8, 2016 at 16:25
  • $\begingroup$ exactly what I needed in 2022. Same location, but now the Outliner is called Collections. Collections Panel > Scenes > Scene > Render Data > Render Data > Render Region. $\endgroup$ Jun 4, 2022 at 4:04
  • $\begingroup$ @hatinacat2000 I'm glad it still helps, but the Outliner has not been renamed. $\endgroup$ Jun 5, 2022 at 13:30
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For more control I've written an Add-on which allows to set the Render Border in Camera View:

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Install the Add-on via File > User Preferences > Add-ons. Once it's enabled, use Ctrl+B in the Camera View (Numpad 0), select the Camera and go to Properties > Data > Render Border.

Half size

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Shifting the box

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Repository: https://github.com/p2or/blender-renderborder

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    $\begingroup$ Helpful addon! It's still a bit clunky to set it up to render out a section of an image at a fixed size, but infinitely easier than doing it without the addon. $\endgroup$
    – MrFlamey
    Feb 3, 2017 at 2:56
  • $\begingroup$ This looks great! Before I start digging deep in the code: would it theoretically be possible to write an addon which lets you draw a custom shape for the render border? My use case is as follows: I have a nice shot but it contains also a great part of a white wall. So I'd like to set an L-shaped render border which leaves out the wall. $\endgroup$
    – Vincent
    Jan 13, 2021 at 13:16

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