It is easy to upload a photo exactly as it comes from a phone or camera, but those files are often much larger than a website actually needs.
A photo can be several thousand pixels wide even when it will only appear in a much smaller space.
Resizing first gives you more control over the final result.
It also helps prevent oversized files from taking up unnecessary storage or making uploads slower.
The main thing to watch is the aspect ratio. If you change the width and height without keeping the original proportions, the image can look stretched.
Using a simple online image resizer makes it easier to adjust the dimensions without changing the natural shape of the picture.
Once the image is resized, check it at the size where it will actually appear. If it still looks sharp, there is usually no reason to keep the larger version for that page.
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