Google Docs has a revision history pane that allows you to view at a glance all changes made to a doc by each collaborator. To access revision history in Google documents, drawings, and spreadsheets, follow these steps:
These steps are applicable to Google spreadsheets, documents, and drawings. Learn more about revision history in presentations.
1. Select File > See revision history.
3. Click a time stamp in the right column to see what changes were made at a given time or use the arrow keys to scan through many revisions quickly. For example, James, whose edits show in orange text, deleted and added text while bmichael, whose show in green text, removed a paragraph and added a comment.
5. If you’d like to revert to the version you’re currently viewing, click Restore this revision.
6. Note: Restoring your document to a previous version does not eliminate any versions of your document. Rather this version moves to the top of your revision history, maintaining all previous versions of your document, including the current version.
8. If you’d like to return to the the current version of your document to continue editing, click the X in the upper right of the ‘Document History’ pane.
For all Google Docs types, revisions are grouped into short time periods to make it easier to see the full history of changes. If you want to see more fine-grained revisions, click the Show more detailed revisions button in the lower right of your document.
Google spreadsheets sometimes trims down your revisions over time to save storage. If you’re working in Google spreadsheets, and your document is either large or you created it a long time ago, your revisions may be pruned. Visit the Revision Pruning help article to learn more about this process.