Is there any software, browser extension or anything (except WP plugin) to find all 404 error pages at once?
Yup, see this: https://chrome.google.com/webstore/detail/broken-link-checker/nibppfobembgfmejpjaaeocbogeonhch
You can also try this software mate - Screaming Frog (https://www.screamingfrog.co.uk/seo-spider/)
Thanks for this Chrome extension.
I think the free version of this tool has a restriction of 500 queries. I am actually looking for a free way to find that. Anyway, @Shivansh's extension seems to work well. Also, I have just got a website called http://www.brokenlinkcheck.com (Just sharing. In case someone doesn't want to use browser extension).
Thanks for sharing mate, will look into this.
Here are some awesome sites and tools:
I am using the same website to find broken links on my site.
Thanks for making a list. It would help me as well as many other people.
@Kevin_Johnson Hope you are getting good result.
Great thread. I installed the chrome extension and it works like a charm. Thanks.
To check my site broken links I use Broken Link check Plugin. It automatically tells you which links are broken and you can take the action accordingly through plugin itself!!