How it works, what you get, limits
What it does
Build robots.txt and sitemap.xml from the host and paths you type.
How to use
Enter host and one path per line, download both files, put them at your site root yourself.
What you get
Two text files. This does not submit them to search engines or check that URLs load.
Options and comparison
Host and paths.
Generator only.
Limits
No Search Console submit, no crawl of your URLs.
FAQ
Will you submit to Google?
No. Put the files at your own site root.
Disallow: / ?
That blocks crawling the whole site. Check the preview first.