Revision history in Google Docs

Google Docs, Sheets, and Slides have a revision history pane that allows you to view at a glance all changes made to a document by each collaborator.

Open your Google Drive account and open any document.

Click File and select See revision history.

On the right side you will see the revision history. Click on one of the previous editing.

Changes made in this editing is colored green. So you can quickly see what has been changed.

If you want to renew any version of the document, just click on Restore this revision.