How can I check for inactive URLs or 404 errors ?

Hello there! You probably know that if your site have a lot of inactive URLs, in other words such that point to a 404 error, that means that Google will push them down in the ranking compared to a site that doesn't have.

So here comes my question: how can I check (with an online app or a software) which are the inactive URL-s and links that point to nowhere?

I remember that before I was using a software program called Screaming Frog SEO spider, but the free version allows cawing only 500...

How can I check for inactive URLs or 404 errors ?

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