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Hello,

When adding an image using an HTML img tag, the file size may vary from the following properties: width and height values/styles applied to the image (a pixel is around 3/4 of a point so they may be recalculated to get a proportional image, other size types such as % are handled) and dpi of the image (https://www.phpdocx.com/documentation/cookbook/standardize-image-size); when width or height (or both) aren't set they are calculated automatically from the image dimensions. Setting the correct previous values will output the exact image sizes you need; we usually recommend setting both width and height values and using standard dpi values to get exact image sizes (https://www.phpdocx.com/documentation/cookbook/standardize-image-size).

In a DOCX document, an image size can change when the content is added into specific contents that have sizes too, such as tables or textboxes.

Please also note that using a Premium license, you can also use phpdocx_image available in HTML Extended, that includes more options when adding images from HTML to get exact outputs easier.

Regards.