When you create a post and upload an image. It is little difficult to adjust manually same width for each image in all posts if you already published lot of posts. One solution for this is predefined max image width in post body. Different bloggers have different blog template and layout width. Because of that post body width is different but it is not less than 500px by default. So that we can choose the image with near about 200px-250px or width that suite you blog design. Hereunder is the pictorial example of this:

max-image-size-for-smart-media-publishing

Steps to get same image ‘Max Image Width’ in Post Body of Blogger:

1. Blogger Dashboard › Template › Edit HTML
2. After that find this code ]]></b:skin> in the template
3. Add the following code just above this

.post-body img{max-width:250px;height:auto;clear:both}

4. Now Save template › Done

You can change highlighted value in red colour as per your blog width.

Need More Help? Just do comments.