Smaller image size really helps to improve blog articles and to reduce image storage.
Google PageSpeed Insights recommends Losslessly image compression to improve user experience.
In this blog, I will use lossless image optimizer OptiPNG which I used to optimize PNG images used in my blog.
- Official Website: OptiPNG: Advanced PNG Optimizer
S1.1. Download Admin Scripts YLNotes_ImageOptimizerPNG_OptiPNG
Note: Admin Script includes OptiPNG v0.7.5
S1.2. Unzip to the root of the drive
S1.3. Batch file YLNotes_ImageOptimizerPNG_OptiPNG.cmd is set with default settings and if you wish to add more parameters, edit the batch file and update Section  OptiPNG – OPTIPNG_PARAMS
S2.1. Put PNG images to be optimized into PNG_IMAGE folder
Note: For WordPress, to optimize all PNG images, copy uploads folder (wp-root\wp-content\uploads)
S2.3. Upload your optimized PNG image to your blog.