It is easy to focus on how an image looks and forget about how large it actually is.
A photo from a modern phone can be far bigger than what a normal webpage needs. If you upload that original file without checking the dimensions, you may end up using more storage and bandwidth than necessary.
Start With the Display Size
Think about where the image will appear.
If the page only displays it at around 1200 pixels wide, there is little benefit in keeping a version that is several thousand pixels wider.
Reducing the dimensions first can make the file easier to handle without changing the way it looks to visitors.
Keep the Proportions Natural
The main thing to avoid is stretching.
Changing the width and height independently can make faces, products, and other objects look distorted. Keeping the original aspect ratio usually gives a much cleaner result.
For quick adjustments, the resize photo online tool from The Image Tool can help change image dimensions directly in the browser.
Check the Final Version
After resizing, look at the image at its actual display size. If it still looks sharp and balanced, there is no reason to keep an unnecessarily large version for that page.
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