Suitable Image Pixel Size for Blogging

It is a common sense that any picture taken from iPhone and Android phone needs to be re-sized before it is good to post on a blog.

But, there is no standardized way to shrink an image. In Photoshop, I used to use the "Resize image" command to shrink an image. I maintained the aspect ratio and I shrank the image to certain percentage by "trial-and-error" or "guessing".

I just found a magic number on a website: 690 pixels. I do not understand why 690 pixels, but it works very good at least for my blog page: (https://jimmy2046.github.io/photo01.html)

For example, in Linux Pinta image editor, if the original size of one side of an image is 1800 pixels.

• I click the Image -> Resize Image menu
• In Resize Image window, click the by Absolute Size button
• Make sure the "Maintain aspect ratio" option is checked on
• (For me), on the longer side, I type 690 pixels. Notice that another size will also be shrunk automatically
• Click OK button. Now the image is good for online HTML blog posting

Reference:
10 Tips on Best Image Size for Your Blog
http://www.1dogwoof.com/10-tips-best-image-size-blog/