Minification - js:
https://javascript-minifier.com
http://dean.edwards.name/packer/

Minification - css:
https://cssminifier.com/


compression - photos:
https://compressor.io/
http://sixrevisions.com/tools/8-excellent-tools-for-optimizing-your-images/


convert photo:
https://converter.11zon.com/en/image-to-webp/
(good to use)
https://image.online-convert.com/convert-to-webp
(one by one)
https://cloudconvert.com/
(limit of 10 images per day and need to sign up)




http://media4x.com/site-optimizer/

http://media4x.com/png-minimizer/



http://sixrevisions.com/tools/8-excellent-tools-for-optimizing-your-images/