Instant tool · free
Redirect mapping tool
Every URL your site publishes, pulled from its own sitemaps, grouped by section, and handed back as a two-column CSV you can fill in. The part of a redirect map that eats a week is assembling the old inventory and working out how much of it there is. That part is automatic.
Reads the sitemaps the site already publishes. No crawl, one polite pass.
What it does, and what it will not do
It reads the sitemaps the site already publishes, follows a sitemap index to its children, and groups what it finds by first path segment so you can see the shape of the move before you plan it. One polite pass, no crawl.
It does not guess where anything should point. Nothing can, before the new site exists. A tool that invented destinations would hand you a map that looks finished, and a redirect map somebody trusted and shipped without checking is worse than not having one at all.
If a site publishes no sitemap there is no inventory to read. That is a finding in itself, and usually the first thing to fix.
Why the inventory is the hard part
Most redirect work goes wrong on scale rather than on individual rules. Teams map the sections they remember and discover the rest after launch, when the traffic has already gone. Seeing that a quarter of the site sits under one path nobody mentioned in the kickoff changes the plan while changing it is still cheap.