The recommended width for a Blogger header image is 1000 pixels, though the image can be up to 1600 pixels wide. Blogger will automatically crop images that are larger than 1600 pixels. The height of the image can be any size up to 1600 pixels.
Here are some tips for adding a header image to Blogger:
- To add extra margins to the image, increase the whitespace around it.
- To use a transparent background, save the image as a PNG instead of JPEG.
- To improve your blog's SEO, include keywords in the image's alt text.