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If two monitors are not aligned on the top or bottom edge, is there a way to find out the value of the offset on either one of the edges? I want to do it without purely visual inspection using a screen ruler like jruler because I need it to be exact (+/- 0 pixels). I'm looking for an Win7 and up solution (those can be separate solutions as well, mainly I'm focused on Win7).

I have no problem with 3rd party applications, if it's not possible to do without, but I prefer "portable"ones (no installation needed).

To make sure what "offset" I'm referring to here's a screenshot in which the bottom and top offset of two monitors is marked (note: this is a Win10 screenshot).

visualize offset in monitor alignment

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2 Answers 2

Reset to default
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This has been answered here:

What registry key or windows file determines where monitors are placed in a multi monitor environment?

Relevant registry keys for Window 7 and up are to be found here:

HKLM\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration\

Look for Position.cx and Position.cy in each of the subfolders.

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  • Each monitor is in there multiple times, how do I find the right regkey?
    – Albin
    Commented Mar 17, 2020 at 8:10
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How about opening any conventional (rectangular window) application and moving it so that it straddles both monitors? If you care about top-of-window alignment, then move the app to the top of the screen.

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  • Thanks for you're suggestion. I'm not sure what you mean? How does this tell me the length of the offset?
    – Albin
    Commented Oct 28, 2018 at 16:43
  • @Albin: Either measure the onscreen offset (like with a tape measure/ruler), or reposition the monitor(s) until it is aligned and then measure how far it moved. (Maybe I don't understand the question.)
    – wallyk
    Commented Oct 28, 2018 at 18:53
  • yeah, I'm already using jruler (see question), although it's possible to get an estimated measurement (+/- 2pixels) if find it rather cumbersome (because of shadows etc.), if you have a more "exact" method that's easy to apply please let me know. I guess I could switch to "classic" view, maybe that works better, but I rather have a solution which leaves the Windows settings intact. A screenshot would be good, so I know what you mean.
    – Albin
    Commented Oct 28, 2018 at 21:27

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