Does this work on a plain Apache or Nginx server?

No - _redirects is specific to Netlify and Cloudflare Pages. Use the .htaccess or Nginx Redirect Generator on this site for those servers.

Does this tool send my input anywhere?

No - the file is generated entirely in your browser.

Generate a _redirects file from a list of old and new URLs, for Netlify or Cloudflare Pages.

From

Permanent (301)

/old-page  /new-page  301

Files never leave your device - everything is generated entirely in your browser.

1
Add one or more redirects

An old path and its new destination.
2
Choose permanent or temporary

301 (permanent) or 302 (temporary).
3
Save it as _redirects

At the root of your Netlify or Cloudflare Pages project.

Does this work on a plain Apache or Nginx server?: No - _redirects is specific to Netlify and Cloudflare Pages. Use the .htaccess or Nginx Redirect Generator on this site for those servers.
Does this tool send my input anywhere?: No - the file is generated entirely in your browser.