Vandalism is editing deliberately intended to obstruct the project's purpose of building a free encyclopedia. Examples include adding irrelevant obscenities or jokes, illegitimately blanking pages, and inserting obvious nonsense. Not all bad edits are vandalism. If an edit is misguided but plausibly made in good faith, you can try undoing it once, but you should use the dispute resolution process if it is restored. Most vandalism is obvious, so don't be afraid to fix it.
Go to the page's edit history. On desktop displays, this can be found at the top right of the page, next to the search bar.On mobile devices, this is represented by the icon at the top of the page.
Adjust the circular radio buttons at the left and click on Compare selected revisions until you identify the edit(s) that introduced the vandalism.
Click the (undo) link at the top right, in the "revision as of" lineGo back to the edit history and click undo.
Scroll to the edit summary box and add "reverting vandalism" or something similar to the automatic summary.
Click Show preview to make sure your edit removes the vandalism as intended.
Click Publish changes, and pat yourself on the back!
If you are unable to revert the vandalism because of subsequent edits, you can fix it manually. Here's how:
Manual reverting:
Click on the page's edit tab. On desktop displays, this can be found at the top right of the page, next to the search bar.On mobile devices, this is represented by the icon at the top of the page.
Find the vandalism and correct it.
Scroll to the edit summary box and add "reverting vandalism" or something similar to the automatic summary.
Click Show preview to make sure your edit removes the vandalism as intended.
Click Publish changes, and pat yourself on the back!
It is better to fix vandalism yourself, but if you're not comfortable editing an article directly, it's alright to just let others know about it:
If the page is high-traffic:
Go to the page's associated talk page. On desktop displays, this can be found at the top left of the page. by clicking on the tab just below the title.
Click on Add topic.Click on Add topic.
Enter a heading and concisely describe the vandalism you noticed.
Warn the vandal: It is good practice (although not strictly necessary) to give the vandal a warning on their personal talk page after you revert them.
Report chronic vandalism to administrators: If the vandal persists after receiving a level-4 warning on their talk page (which tells them that they may be blocked the next time they vandalize), you should report them to the administrator intervention against vandalism noticeboard.
Find more vandalism to fix: If this was satisfying, you can help identify and revert vandalism with the WikiLoop DoubleCheck tool, which presents a feed of edits flagged by an algorithm.
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