URL contains underscores

Opportunity severity, in the URL tab

Why it matters

Google treats hyphens as word separators but not underscores.

How to fix it

Prefer hyphens in new URLs. Do not change existing URLs without redirects.

How Crawlune finds it

Crawlune flags URL contains underscores automatically on every crawl and lists the affected URLs under the URL tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 550 URLs with every check enabled.