Screen Issue

I want my game to fit in standard screens with hd resolution, 1280x720. The graphics are pixelated so I defined a smaller resolution of 427x280 with the same aspect ratio 16:9 and I'm using the proper screen settings but the problem is that I'm getting black bars on fullscreen.

I noticed that to get a perfect scaling without any bars I should divide 1280x720 by multiples of 2 but it'll give me 640x360 or 320x180 which are too big and too small respectively, (for the project) and will affect the size of the characters.

So how can I get rid of the bars whatever the resolution I choose keeping the correct aspect ratio?

Use scale inner, and design your game so that nothing important gets cut off with a narrow aspect ratio

Or use scale outer, and design your game so that your backgrounds and layouts allow for a wider viewing area.

Scale outer is generally more common. You can use a custom background/texture which would show up instead of black bars, if you absolutely need to have a fixed aspect ratio for your game.

construct.net/en/tutorials/supporting-multiple-screen-17