Validate Image Dimensions in Laravel

Take the following example of uploading an avatar:

$request->validate([
    'avatar' => ['required', 'image', 'dimensions:min_width=100,min_height=200']
]);

That's it. Just tweak min_width and min_height. Of course, you also have max_ available:

$request->validate([
    'avatar' => ['required', 'image', 'dimensions:min_width=100,min_height=200,max_width=300,max_height=500']
]);

If you prefer class-based rules, this generally makes it easier when validating images:

$request->validate([
    'avatar' => [
        'required',
        File::image()
            ->min(1024) // file size
            ->max(12 * 1024) // file size
            ->dimensions(
                Rule::dimensions()->maxWidth(300)->maxHeight(500) //etc
            ),
    ],
]);

With the Rule::dimensions() methods you chain on, they're pretty guessable, but head to the docs for everything available.