How can check missing alt tags?

[bidaddy]

You can do it manually, go to your website page-> source code(ctrl+u) chk there is any changes in metatags like title, description and keywords..

Or else you can check in tools like
metachecker.net
smallseotools.com/meta-tags-analyzer/
seocentro.com
metalength.com

[steffidsouza46]

The SEO Spider is a desktop program you can install locally on PC, Mac or Linux which ... Discover exact duplicate URLs with an md5 algorithmic check, partially duplicated .... Images over 100kb, missing alt text, alt text over 100 characters.