Image optimization

Let WordPress fill in the dimensions itself.

If an image is missing width and height, the browser does not know how much room to keep free — the text below it slips down while loading. The kakapo reads the dimensions from the real file and adds them. On top of that comes an upper limit for very large uploads.

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Image optimization

width and height are added · dimensions taken from the actual file

ActiveSettings

What image optimization offers

width and height are added

Dimensions from the real file

For local images in content

Upper limit for large uploads

Here's how it works

Image in content without dimensions

The kakapo reads the file

The attributes sit in the markup

FAQ about image optimization

What is layout shift?

The jump when an image finishes loading and pushes the text below it away. If width and height are in the markup, the browser reserves the space from the start.

Are external images covered too?

No, local ones only. For files on other servers, the dimensions can't be read reliably.

What does the upload limit do?

If you upload a very large image, WordPress creates a smaller version of it and serves that one. You set the edge length at which this happens yourself.

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