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Uma diff (ou dif, abreviação de diferença) exibe as mudanças entre duas revisões de uma página. Difs são um dos componentes principais de navegação e moderação de conteúdo nas wikis alimentadas pelo MediaWiki.

As plataformas do ecossistema wiki possuem diversas versões da funcionalidade dif, a depender de qual dispositivo e instalação do MediaWiki estiver sendo utilizada.

The main reason to use a diff is to review a specific change to a page made by yourself or someone else. There are many possible reasons to do this:

• To help find instances of vandalism
• To determine when a section, sentence, or word was added or removed
• To determine which editor made a given change
• As a starting point to further actions as the diff contains editar, desfazer, and other actions as well as links to the editor's user and talk pages.

The most common way to view a diff is through the "Revision history". This is accessible via the "Ver histórico" tab. From there, you can use "ant" to view diffs of single revisions, or use the radio buttons and the "Comparar as versões selecionadas" button to view diffs across multiple revisions.

• Special:RecentChanges
• Special:Watchlist
• Special:Contributions
• Special:Relatedchanges

Another way to view a diff is with the Special:Diff page. To use this, you must know the IDs of the revisions you want to compare. Revision IDs can be retrieved by looking at the diff=123 portion of a diff URL, where 123 is the diff ID. Additionally, you can use the value of the oldid parameter to get the diff of that revision against the previous one.

O exemplo interativo a seguir exibe a parte superior de uma página de dif (as ligações usadas no exemplo são meramente ilustrativas). A revisão mais antiga é exibida à esquerda, enquanto que a revisão mais nova o é à direita.

Edição das 22:32, 3 agosto 2003 (editar) Tim Starling (discussão | contribs) (Edit summaries in diffs are great) ← Edição anterior		Edição das 00:10, 18 agosto 2003 (editar) (desfazer) (agradecer) Angela (discussão)    reverter 1 edição m (correction, + MediaWiki User's Guide)
Linha 8:		Linha 8:
	For sysops and those with the rollback flag, a revert button is shown allowing them to revert from the new version to the old one.		For sysops and those with the rollback flag, a revert button is shown allowing them to revert from the new version to the old one.
−	This is only shown when viewing the diff between the current version and the one immediately preceding it.	+	This is only shown when viewing the diff between the recent version of a page and the last version by an author other than the one of the most current version.
	This example shows the top of the diff page, with the links described above.		This example shows the top of the diff page, with the links described above.
Linha 25:		Linha 25:
	</table>		</table>
		+	[[MediaWiki User's Guide]]
		+

Identical text that has moved from one place to another is usually represented as added and removed text. On MediaWiki installations using Wikidiff2 , there may be an arrow icon more clearly indicating where the moved text went to.

Lines containing added text have a plus icon (+) before them. The added words and characters are highlighted and in bold.

Lines containing removed text have a minus icon (−) before them. The removed words and characters are highlighted and in bold.

Inserted and removed text is highlighted with the border color and in bold. Where whole paragraphs have been removed or inserted, no highlighting or bolding is applied and the other side is blank.

Para obter uma ligação de uma dif para ser usada fora de uma wiki, basta utilizar o URL completo, p. ex.:

• https://mediawiki.org/w/index.php?diff=1242287

Para obtê-la de forma a usá-la internamente em uma wiki, a ligação pode ser estruturada das seguintes maneiras:

• [[Special:Diff/1242287]] → Special:Diff/1242287 – Mostra a dif entre a revisão especificada e sua antecessora na mesma página.
• [[Special:Diff/1242287/prev]] → Special:Diff/1242287/prev – Shows the diff to the previous revision of the same page.
• [[Special:Diff/1242287/next]] → Special:Diff/1242287/next – Shows the diff to the next revision of the same page.
• [[Special:Diff/1242287/cur]] → Special:Diff/1242287/cur – Shows the diff to the current revision of the same page.
• [[Special:Diff/1242286/1242287]] → Special:Diff/1242286/1242287 – Shows the diff between the specified revisions of the same page which may also be reversed, e.g. [[Special:Diff/1242287/1242286]] → Special:Diff/1242287/1242286, though one should avoid this.

By default, the later revision of the page is displayed in full below the diff — this can be turned off via a preference ("Não mostrar o conteúdo da página ao comparar duas edições") or by setting diffonly=1 in the URL. Links to diffs without the page text can be created:

• {{canonicalurl:Special:Diff/1242287|diffonly=1}} → https://www.mediawiki.org/w/index.php?title=Special:Diff/1242287&diffonly=1

Since MediaWiki 1.35, an inline diff (also known as a unified diff) is available. As of 2022 this is only available with the wikidiff2 engine. Inline diffs can be accessed by passing the diff-type=inline parameter in the URL (example).

Content added Content deleted

Edição das 22:32, 3 agosto 2003 (editar) Tim Starling (discussão | contribs) (Edit summaries in diffs are great) ← Edição anterior		Edição das 00:10, 18 agosto 2003 (editar) (desfazer) (agradecer) Angela (discussão)    reverter 1 edição m (correction, + MediaWiki User's Guide)

For sysops and those with the rollback flag, a revert button is shown allowing them to revert from the new version to the old one.

This is only shown when viewing the diff between the current version and the one of a page and the last version by an author other than the one of the most current version.. This example shows the top of the diff page, with the links described above.

</table>

[[MediaWiki User's Guide]]

↲ newline

• Legends and tooltips that explain the blue and yellow highlights. (T324759)
• Annotation that represent when one or more lines are added or deleted. (T330247)

Não mostrar o conteúdo da página ao comparar duas edições

Toggle the display of the page text below the diff. This text is the later of the two revisions of the page.

Omitir diferenças após fazer uma reversão

Whether to show the diff of the rolled back revision after a rollback.

Some extensions also add their own preferences related to diffs. One such extension is Extensão:Deslizador de Revisões , which can be disabled in preferences using the "Não exibir o Deslizador de Revisões" preference in that section.

• Help:History — Navigating and understanding page history.
• Diferenças visuais — Diffs in the VisualEditor and VisualDiff extensions.