Check the files at your site’s root before they bite WELLKNOWN
The files at a site’s root are edited once and forgotten, and each has a mistake that stays invisible until it costs something. Paste one and see what it actually says, and what is wrong with it.
The file
What it says, and what is wrong
How it works
Why these three
robots.txt, sitemap.xml and security.txt are hand-edited, deployed once and never looked at again, until a bad rule hides the site from Google, a sitemap of dead links wastes crawl budget, or a researcher finds an expired security.txt and gives up. WELLKNOWN reads each back plainly and flags the specific fault. It checks the text you paste and never crawls your site; to build a correct SPF/DMARC/DKIM record set or a security.txt from scratch, see DMARC.
Doing this often? OBSCURA Umbra edits the site's files where they are and previews the pages, with search and replace across the folder. On its own, US$4 a month; with everything else, US$9 a month or US$79 a year. 7 days free.