Reduced image quality on a website

Photoshop can help you to resize image to correct dimensions which depends on theme and your preference. You must learn that by hard, I do not know easy way to explain. Perhaps you have option to upload multiple dimensions of your image for different screen dimensions or that job is set to be done automatically? If you can upload multiple dimensions of the same image then Photoshop can help you to properly scale plus to optimize images when exporting them.

The width of the image is 827px.

You made the Screenshot with a width of your browser of about 1900 px.

Since the image is resized to full browser-width it looks blurry.

It looks fine, when you rescale your browser-window to a lower width.

If the original image is big enough, you could rescale the image in Photoshop to the width of the biggest monitor you wish to provide (for example 1920px) and re-upload the image to wordpress.

But consider that the kBs and loading-time of your image will increase (about four times), so I would cut the image in the height to save some kBs, the upper and lower parts are never visible.

Take care to disable wordpress to rescale the image during the import (there should be a setting, I dont´t remember where to find in current wordpress versions)

Hi @paulblair ; what wordpress theme are you using ? Maybe that can be fixed in the theme settings .

Resolution is meanless on the web. Display use their resolution. All that matters is the number and quality of the pixels you have for an image. To me it sounds  like you resizing your images to small or are using a poor choice of interpolation method.