So, is it just me or? Looks like everyone here is resizing images the wrong way? There is a dedicated function called resize where you enter the size you need and it will resize it properly. You decide whether to adjust format automatically (where it will calculate a fitting size) or to keep it as it is (which might end up squeezing the image though if you type in the wrong size). Using this functino the image never looked like in the screenshot above by OP or more ugly*. So far I never had issues with it. I always use this dedicated resize function.
* That's probably a thing of perspective and quality of the source image. Resizing a tiny image to a big resolution will make it very ugly ALWAYS and the same the other way around. Under normal circumstances however the images always look pretty much normal just with the desired smaller resolution.
(example based on Paint.NET but MS Paint has the same function with almost the same options)
I never used the transformation tool to change size of the images. That tool resizes "rather strangely" while the dedicated resize function uses proper
image resizing algorithms that your online image resizer is also using. The online services do exactly what the dedicated resize function does. The only place where this transformation resize works, kind of alright, is office if you have good source material.
So... MS Paint is enough to simply change the size of an image or of course you can do the very same in Photoshop. The resize function there is also available despite being a bit hidden in some of the many menus. I'm not a photo editor or a photogapher but I know enough to be able to resize an image without making it look like it has been squeezed through a drinking straw. GIMP is even worse... the function there is hidden even more.
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https://www.pugetsound.edu/about/offices...photoshop/
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https://helpx.adobe.com/sea/photoshop/ho...asics.html