@marc -Collabello--Phase Locked- 's response is a very good suggestion.
If you need something on a larger scale, there's a tool on the Marketplace called Confluence Command Line Interface (CLI) offered by Bob Swift Atlassian apps. If you have many pages to change, I believe it's able to do this. It also has multiple options to report, modify data, and copy data for a number of purposes.
I don't work for them, but have used the tool on occasion for more than a year. It's been very helpful.
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