Shows the two files side by side with changed lines highlighted, and the specific value that changed picked out inside the line.
In YAML, indentation is meaning — two spaces versus four can change which block a setting belongs to. Leave Ignore whitespace switched off when comparing YAML, unlike most other formats, or you may hide a real difference.
Comparing a Kubernetes manifest before and after an edit, diffing a CI pipeline definition against a working one, checking why a Docker Compose file behaves differently on another machine, and reviewing an Ansible playbook change.
Yes. Config files are full of hostnames, ports and sometimes secrets. Nothing here is uploaded — the comparison runs entirely inside your browser.