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Free sitemap.xml generator
Build a valid sitemap, and see what your robots.txt already declares.
A sitemap tells search engines which URLs you want considered. It does not make anything rank, but it does stop pages being missed — particularly on sites where some pages are only reachable through a search box or a filter.
This also reads your robots.txt and reports any sitemap already declared there, which is worth checking: plenty of sites have a sitemap and never tell anyone about it.
What this free version does not do
It builds the sitemap from the links on the one page you give it, and does not crawl your site. That is on purpose — a public tool that crawled on demand could be pointed at anyone, and we are not willing to be the thing that floods a stranger's server. Xeostack crawls your own site properly once it is connected.
Other free tools
These are one page each. Xeostack does the same work across your whole site, continuously.