This is a brief introduction for those who don't know the next information:

The new Windows 10's flat window style uses a different window-border mechanism than previous Windows versions, which affects in a horrible way the window aspect, and its usage, in the meanning of window-resizing and window-positioning.

Windows 10 by default has a 1 px. visible border, notice the word "visible", because the reality is that the border width is greater, simply is just an invisible border, that is, the border image resource that Windows 10 uses it only fills 1 px. of the real width of the window border bounds, no matter how big is the border width, you always will only see 1 px. border, and here you can imagine by yourself the problem that can cause.

In Windows 10, as in previous Windows versions, you can perform some registry changes to increase the window borders width, this is an example of what I mean, for Windows 8:

enter image description here

enter image description here

However, as for the (bad-design) "rules" of Windows 10, if the user tries to reproduce the same registry trick in this O.S, nothing will change in the window aspect, you'll end up with a geater border, yes, but remember that only 1 px. of that border will be visible, so you'll end up having a damn 1 px. visible border with a big and annonying invisible resize handle.

This poor, bad, unfriendlly, and horrible design decission of Microsoft is a fact, as is also a fact that exists much users who loves this 1 px. border aspect, their oppinion is respetable, however, honestlly those users only fix their oppinion on the O.S. aspect, they don't notice the wrong behavior that 1 px. border can cause to they, whch will break the end-user productivity and comfortableness, even just with simple things like trying to move a Window, or trying to difference which window is over to other, because the border of all windows are invisible.

This issue has been discussed over "all" the Internet forums related to Windows 10 personalization, here is a simple but never-ending discussion topic on a Microsoft Community thread for your interest:

( As you can see, the topic has been created 2 years ago, has +14.000 views, +100 replies, +270 recommends, but ZERO answers and ZERO fixes or responsabilities from Microsoft team, yes, is very disgusting. )


The pressence of that damn and uncustomizable? 1 px. border, there is where all the problems and worst nightmares begins with Windows 10.

I always loved to use a program named Sizer in previous Windows versions, which is an application that lets you positionate any window to customizable preestablished positions for any visible window in just one click, however this kind of time-saver window organization applications can't work as expected in Windows 10 because the damn invisible border, because the size of the invisible borders will be sum when calculating the position for the window, and this is translated into an annonying empty space on the desktop between the positioned windows and the desktop margins...

For those who are familiar with Sizer, this is an image to let you understand what I mean, the blank space between positions (which are the size of the damn invisible border of Windows 10): enter image description here

So, for me and my reasons, having a 1 visible px. border is a very big problem that I'm facing every day using Windows 10, I'm really ...desperately jaded.

I won't rollback to a previous Windows version because I gain more by using Windows 10 O.S and its performance advantages, however the 1 px. border is the most horrible disadvantage of this O.S, I would like to feel happy by having a real window border like in previous Windows versions, this means a border image that fills the entire border width (like the images of the comparison I published above in the question introduction), I don't want to have a 8 px. border in which only 1 px. is visible, that is crazy, I don't know in what the hell were thinking the devs. who designed Windows 10, if you will give the name "Windows" to your own O.S, then try to design and implement a real "window" appearance and beahavior, then avoid implementing invisible window resize handles for the mother of God!!.


At this point, knowing that In Windows 10 the real border width is 8 px, but only 1 px. is shown, and the rest of the border is just... invisible,

I would like to ask for a possible solution to turn visible the border in Windows 10, I mean to have a real window border like in previous Windows versions, with a border image resource that fills the entire border width, NOT an invisible border.

I'm aware this question probablly needs advanced knowledges, further investigation and personal testing, because Google's result pages will not show anyone how to solve this issue, all the people talk and discuss about this 1 px. border issue, but no body seems to know a solution, and worst than that, Microsoft seems is not listenning to anyone and to the reasonable design of a "window".

I must say that I have an application named Windows Style Builder (for Windows 10 version), which is able to open a .msstyle theme file to edit any image resource contained in the theme, that program was the only hope I found to try find and make greater the border image resource to fill the entire real border width, however I tried to make bigger all the border image resources used in Aero theme, but Windows 10 remains showing a 1 px. border, seems no matter how much big is the border image resource used to show the border by the theme, seems the displayed border width is not controlled by the theme itself (I don't really know), so my nightmare is to think that seems a person with reversal engineering knowledges to create a kind of home-made patch to apply to who knows which executable or windows resource could be required to solve this annonying issue of Windows 10, I really hope this thing could be solved in a more friendlly way.

I don't know what more to investigate and to try by myself.


The only requisite I claim for, is that a possible solution should not imply using a 3rd party theme like for example Aerolite, this is because I'm already using a 3rd party darker windows theme, so If I change to other (light) theme then I will end-up having a new problem.

For that reason, please take really into account that my question is "How to turn visible the invisible window's borders of Windows 10", is not "which 3rd party theme I can install to see window borders in Windows 10?".

Please also try don't focus the question to Sizer alternatives, those alternatives are welcome and appreciated from my side, of course, really, however the real problem is the invisible borders of Windows 10, which not only will affect Sizer, is a problem that will affect to overall usage of the O.S.


These paragraphs below are just to argument why Stardock's WindowBlinds can't be described as a solution in any manner. You can ignore all these words below.

Obviouslly Stardock's WindowBlinds will be a good personalization program for other kind of purposses, or for those who feel good using it, but not just for making visible the window borders in Windows 10, for these reasons:

( Please note that my intention is not to defame Stardock's products or dev. team, I had bought Fences years ago and Its a very professional application that I think everyone must have for desktop icons organization, I really can't live without Fences, so I appreciate Stardock's work. )

  • The program uses a kind of special technology that seems is not featured in common Windows themes, because it doesn't apply a theme file neither it doesn't involve a .msstyles file that contains the theme resources and settings as we know.

  • My affirmation above is argumented because after a file and registry monitoring I didn't discovered how they "add" borders to the windows, the program didn't made anything relevant with Windows themes related registry keys or windows theme files/directories, so I suspect this program must use API hooking techniques on some UX Theme Win32 APIs to change the resources at execution time, then an advanced monitoring of the calls to WinAPI functions is required to confirm my suspection.

  • It is an application that implies applying a custom WindowBlinds theme to "add" borders to the windows, and that consumes much resources, much.

  • The program changes the taskbar style and the winstart menu, which affect its behavior, seems the end-user cannot decide to disable those features (I'm not sure), so the usage of WindowBlinds limits you to be unable to use programs like StartIsBack++ to get a decent winstart menu (I tested it, and it breaks StartIsBack++), on the other hand, probablly [Stardock's Windowblinds] should support their Stardock's Start10 product, just to mention it for those who feel interested, but in my oppinion it has nothing better than StartIsBack++.

  • WindowBlinds really does not turn visible the window borders, what it seems to do is reduce the original window rectangle to print fake borders, which produces a higher non-client rectangle or "invisible window borders rectangle" more annonying than the Windows 10 default, which totally impossibilites (even more) the usage of programs like Sizer and etc. to manage the window positions, because this is the real, modified window rectangle after a WindowBlinds theme is applied:

enter image description here

  • We can continue saying that it adds a (unwanted) shadow over the window, even when you disabled all the effect options in the Control Panel settings, this is because as I mentioned at the beginning this program seems is not using common Windows themes, so the control panel options that affects to Window themes will not affect to WindowBlinds themes, instead I suspect this program uses API hooking techniques to "create" the theme environment (and fake borders). WindowsBlinds has its owns effect configurations.

  • As a last disadvantage, WindowBlinds is a paid product, and it is a "complete" personalization application, I mean that one person should not think to pay for and to install a full suite of personalization just to try to do a single change in a Windows theme.

  • Sizer doesn't fully support Windows 10. However, you can still use Sizer by hovering on one of the window corners and whenever the pointer change to Two-directions arrows, just right-click, and the Sizer menu will popup, enabling you to resize the window from the saved presets. One other thing, if you see any hangs on the windows, just change the Compatibility to Windows 7 and run Sizer as an administration, thus could solve your problem temporarily until the next release of Sizer.
    – iSR5
    Jul 18, 2016 at 15:15
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    ask this in the Windows Style Builder community. They create a lot of themes, so they can help you. I and 99.99% of the users here never did this and creating bounties over and over again won't help here. Jul 20, 2016 at 15:24
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    @magicandre1981, harrymc, thanks for comment but as I explained in the question I'm using a custom darker theme for my eyes, is not possible to change to aerolite theme. However could be good to know that a custom theme for Windows 10 like Aerolite has visible borders, that is a proof that the window borders can be turn visible for any other 3rd party theme for Windows 10, the question is: how to? Jul 25, 2016 at 21:34
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    Holy f'ing shiznit that's a lot of detail!! Wonder what genius programmer is going to come up with a workable solution to this problem. If there's anyone that could do this, I bet it'd be one of these guys here on SuperUser and/or other SE communities... I look forward to upvoting such a workable solution to this issue since so many people are affected by it, and MS cannot seem to give a solution from what you say. I'll await the working answer and praise the hero who finds this solution. Jul 28, 2016 at 1:49
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    IMHO the best solution would have been to publicly stone the one who had the idea of one-pixel window borders, and publicly stone the ones who implemented it. ;-) Only a monopolist can enforce such stupidity!
    – U. Windl
    Mar 17, 2020 at 13:11

5 Answers 5


I have a conjecture: All custom themes are based on editing built-in aero.msstyles or aerolite.msstyles, located at %windir%\Resources\Themes\aero. aero comes with fixed 1px border, while aerolite has 1-8px border, configurable through registry or WSB (9px or above remains invisible). So far there is no public documentation on how to build msstyles from scratch. As such whether your theme has configurable visible border depends on which default msstyles was based on.

You are advised to seek professional assistance at Virtual Customs.

  • 2
    I give up. I've experimented on multiple msstyles files with WSB to no avail. End up screen flashing several times already. This is not something a novice can solve.
    – guest
    Aug 2, 2016 at 19:31
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    Thanks for editing your answer adding more details. I will try asking on Virtual Customs, however I think they don't know how to do this, because Mr Grim's themes for Windows 10 are borderless (better said: a "fixed" 1 px border), the theme that I'm actually using is a dark theme made by him. Aug 3, 2016 at 18:46
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    A quick look at Mr Grim's themes, there are a few with borders similar to aerolite, like Poison, Equinox and H2O.
    – guest
    Aug 3, 2016 at 19:59
  • Woah! my fault, at first sight seems true what you are saying!!! I will analyze those themes during today and if I'm able to find the "key" in WSB I'll accept your answer, thanks a lot for the orientation. Aug 4, 2016 at 5:32
  • I tested the borders and is much better than using WindosBlinds with their fake borders, the Mr. Grim themes borders are "real", so I have no problems when moving/positioning a window because the borders are "normal", and Sizer app works fine again with the themes you've mentioned. I think it should be as you said, a theme based on the aerolite.msstyles is the key, so now for me is just a matter of editting that file with WBS, to export/import values from the Mr. Grim's theme based on aero.msstyles to a new theme from scractch based on aerolite.msstyles,thanks a lot Aug 4, 2016 at 10:34

This may not be exactly what you are looking for, but it might assist you. If you go to System or right click "this computer" and go to properties, then on the left click "advanced system settings", click the button "settings" in the "performance" group box under the "advanced" tab, and then set the machine to "Adjust for best performance". After you do that click OK and let the settings kick in. Then try dragging a window around and you will see the "invisible" border box you are looking for that exists in prior versions of windows. Perhaps you can leverage that?

  • Thanks for answer. Just need to disable the "Show window content while moving the window" (I'm not sure is that is the name in English) there is no need to disable all the graphic features, however as you know that will not make visible the borders, it will draw a rectangle over the window while moving, which in any case could be the same what I'm looking for, but really thanks anyways. Jul 25, 2016 at 21:38

Stardock's WindowBlinds ($9.99, 30-day trial available) claims to be able to do this.

Here is an example from their demo for Windows 10 :


  • thanks for answer, do you know whether to do that it implies applying a custom Stardock theme?, that would be a very inconvenient for me as I explained in the question I'm using a darker 3rd party theme, however, you gave good info, I'm actually installing a Windows 10 Virtual Machine to proceed to test the WindowBlinds demo with basic reversal enineering registry and file techniques to see if I can discover "the secret" about how they did that. Jul 27, 2016 at 20:43
  • Unfortunately using WindowBlinds is the worst possible solution, it can't be described as solution, I detail the arguments in the update that I did to my question. Thanks again for answer!. Jul 27, 2016 at 23:34
  • All of Stardock's products are based on Windows tricks and might use undocumented features, which is only logical since most people (including me) have no idea how they manage to do all that. BTW - I believe Classic Shell is more advanced than StartIsBack++, and might not be affected by WindowBlinds. And which are the resources that WindowBlinds uses so heavily ?
    – harrymc
    Jul 28, 2016 at 7:40
  • I'm still interested in knowing which are the resources that WindowBlinds uses so heavily.
    – harrymc
    Jul 30, 2016 at 9:03
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    Thanks for your answer, and I will try to see what WindowBlinds does. But as far as I know, Windows development is now chaotic, in the sense that more and more is done in software, rather than via registry parameters. This is the case for border-width, where the old registry settings no longer work in Windows 10 although they worked fine just until 8.1. To circumvent Windows software, WindowBlinds has now no choice but to hook into Windows. But I will check that out.
    – harrymc
    Jul 31, 2016 at 6:43

Have you tried Divvy? They have a windows version and I believe I use it in the same way you use Sizer. I just tested to see if I get a gap between windows using Divvy by putting a bright blue mspaint behind two chrome windows sized using Divvy and I couldn't see through the windows to the background.

I know it's a paid product and not necessarily the fix you're looking for but seems to be able to do what you want Sizer to do. Perhaps it internally corrects for the transparency you're mentioning in Win 10.

Divvy Link (Windows)

  • Thanks for answer, but this application has much more problems than Sizer. The main problem is that It doesn't support custom positions and sizes, in other words is not customizable, you need to put a window on predefined and very little rectangles, the second problem is that don't works as Sizer, you need to open the program and select one of the very little rectangles every time, and last problem is it doesn't take into account the taskbar space, when you try to put a window in a corner using Divvy, the window will end-up covered by the Windows taskbar, at least on Windows 10 Jul 28, 2016 at 1:03

Copy - paste from Reddit because links die...

On the default theme, you can change the border padding, although the change will be invisible (you'll still be able to resize the window with the now-thicker border though). To do so, you just need to open the Registry Editor, and navigate to HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics From here, just edit the value called PaddedBorderWidth. The formula is -15*border width, so if you wanted a 4px thick border, you can set -60. Just sign out and back in or restart and you'll be able to utilise the changes.

Alternatively, you can enable the Aero Lite theme, which is very similar to the Windows 8 theme. It already has the thicker borders by default but they can be customised the same way as above, however you'll actually see the changes. To enable the theme, navigate to C:\Windows\Resources\Themes\aero\ and run aerolite.msstyles (aero.msstyles is the default theme if you want to switch back).

f this is too much effort, you can use WinAero Tweaker, which has a GUI to alter all these settings and loads more stuff, and reset buttons in case you break something. However, as a general warning, there are some bugs with altering window border thickness and scaling, so I'd only recommend attempting this if you have your scaling set to 100%.

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