Screen.currentResolution and Screen.width / Screen.height not working in build.
It’s not working in unity as it might work. In editor everything works perfectly. For example I have a fullHD display and Screen.currentResolution IN EDITOR returns me 1920 * 1080 and Screen.width plus Screen.height return the editor game window resolution 511 * 909. But IN BUILD both of them returns incorrect resolution. For me it’s sometimes 1080 * 1080 that I can’t even define if screen horizontal or vertical. Sometimes it’s 1024 * 768, better but not 1920 * 1080.
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What version of Unity are you using? Have you filed a bug report?
I also just submitted a bug report for this. It works on Mac and Unity 4.7. But not for Windows and Unity 5.6.4f
When in a fullscreen window it reports the wrong value for Screen.currentResolution.width and height.
breaking code from Unity 4.7
Is there a workaround to get the screen resolution on windows for C sharp? What I want is when people go into fullscreen mode using alt+enter I used to do:
Screen.setResolution(Screen.currentResolution.width,Screen.currentResolution.height,true)
but now this doesn’t work. Without doing this it just in the wrong resolution with black bars at the sides or top and bottom.
I resolved this problem using C# to get full screen size
System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width
System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height
for desktop builds in windows it works perfectly
2019.1.0.f1. I haven’t filed a bug report, I didn’t think it was a bug in the engine but maybe it is.
I asked that 3 years ago 
File a bug report and we can make sure it goes to the right people who can tell you if it’s a bug or not. And fix it if it is 
Holy shit I’m a dumbass. I just asked a really similar question and had this open in a tab so I thought it was my question with a bunch of replies. 
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Having the same issue in Unity 2019.4.17f and was looking for an answer. My screen is 1440p and the editor detects that, but the build only sees 640x480. It’s a bug and has been fixed in recent Unity versions. Unity Issue Tracker - Resolutions returned by Screen.resolutions differ between Editor and Build
Edit 1: Workaround: Instead of Screen.Resolution, use Display.main. For example, Display.main.systemWidth instead of Screen.currentResolution.width.
Answer found here: Screen.currentResolution with Unity 5.2.1 - Stack Overflow
Edit 2: Turns out that the real issue is that Screen.currentResolution.refreshRate returns differently in-editor vs. in-build. In-editor, the refresh rate will be the exact refresh rate of your monitor, say 120Hz. But, in-build, the value will return 119Hz. Therefore, when I was comparing the resolution strings, they were only equal in the editor because of this. So, in-build, the script skipped over my resolution assignment code and defaulted to the dropdown’s first option (640x480). So, ensure you compensate for the difference of 1 somewhere in your code! That fixed it for me.