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<!DOCTYPE html> <html class="client-nojs" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>CAPTCHA help - Wikimedia Commons</title> <script>(function(){var className="client-js";var cookie=document.cookie.match(/(?:^|; )commonswikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":true,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy","wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"c9399560-2c0d-4474-a246-d6b999d23283","wgCanonicalNamespace":"Special","wgCanonicalSpecialPageName":"Captcha","wgNamespaceNumber":-1,"wgPageName":"Special:Captcha","wgTitle":"Captcha","wgCurRevisionId":0,"wgRevisionId":0,"wgArticleId":0,"wgIsArticle":false,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":[], "wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"Special:Captcha","wgRelevantArticleId":0,"wgIsProbablyEditable":false,"wgRelevantPageIsProbablyEditable":false,"wgNoticeProject":"commons","wgCiteReferencePreviewsActive":true,"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":false,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":true,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":0,"wgCentralAuthMobileDomain":false,"upwizPropertyTitles":{"P180":"Main subjects visible in this work"},"upwizPropertyPlaceholders":{"P180":"e.g., Angolan giraffe"},"upwizPropertyCopyLabels":{"P180":"Main subjects"},"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"personal","wgULSisCompactLinksEnabled":true,"wgVector2022LanguageInHeader":false,"wgULSisLanguageSelectorEmpty":true, "wbmiDefaultProperties":["P180"],"wbmiPropertyTitles":{"P180":"Items portrayed in this file"},"wbmiPropertyTypes":{"P180":"wikibase-item"},"wbmiRepoApiUrl":"/w/api.php","wbmiHelpUrls":{"P180":"https://commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Depicts"},"wbmiExternalEntitySearchBaseUri":"https://www.wikidata.org/w/api.php","wbmiSupportedDataTypes":["wikibase-item","string","quantity","time","monolingualtext","external-id","globe-coordinate","url"]};RLSTATE={"ext.gadget.Long-Image-Names-in-Categories":"ready","ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","skins.vector.styles.legacy":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","codex-search-styles":"ready","ext.uls.pt":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["site","mediawiki.page.ready","skins.vector.legacy.js","ext.centralNotice.geoIP","ext.gadget.Slideshow","ext.gadget.ZoomViewer", "ext.gadget.CollapsibleTemplates","ext.gadget.fastcci","ext.gadget.Stockphoto","ext.gadget.WatchlistNotice","ext.gadget.AjaxQuickDelete","ext.gadget.WikiMiniAtlas","ext.gadget.LanguageSelect","ext.gadget.PictureOfTheYearEnhancements","ext.urlShortener.toolbar","ext.centralauth.centralautologin","ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.wikimediaEvents.wikibase","ext.navigationTiming","ext.uls.compactlinks","ext.uls.interface"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=codex-search-styles%7Cext.uls.pt%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cskins.vector.styles.legacy&only=styles&skin=vector"> <script async="" src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.gadget.Long-Image-Names-in-Categories&only=styles&skin=vector"> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector"> <meta name="generator" content="MediaWiki 1.44.0-wmf.4"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="noindex,nofollow,max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="CAPTCHA help - Wikimedia Commons"> <meta property="og:type" content="website"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//commons.m.wikimedia.org/wiki/Special:Captcha"> <link rel="apple-touch-icon" href="/static/apple-touch/commons.png"> <link rel="icon" href="/static/favicon/commons.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikimedia Commons"> <link rel="EditURI" type="application/rsd+xml" href="//commons.wikimedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://commons.wikimedia.org/wiki/Special:Captcha"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/"> <link rel="alternate" type="application/atom+xml" title="Wikimedia Commons Atom feed" href="/w/index.php?title=Special:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin-vector-legacy mediawiki ltr sitedir-ltr mw-hide-empty-elt ns--1 ns-special mw-special-Captcha page-Special_Captcha rootpage-Special_Captcha skin-vector action-view"><div id="mw-page-base" class="noprint"></div> <div id="mw-head-base" class="noprint"></div> <div id="content" class="mw-body" role="main"> <a id="top"></a> <div id="siteNotice"></div> <div class="mw-indicators"> </div> <h1 id="firstHeading" class="firstHeading mw-first-heading">CAPTCHA help</h1> <div id="bodyContent" class="vector-body"> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="contentSub2"></div> <div id="jump-to-nav"></div> <a class="mw-jump-link" href="#mw-head">Jump to navigation</a> <a class="mw-jump-link" href="#searchInput">Jump to search</a> <div id="mw-content-text" class="mw-body-content"><p><small> <a href="/wiki/MediaWiki:Captchahelp-text/cs" title="MediaWiki:Captchahelp-text/cs">Česky</a> | <a href="/wiki/MediaWiki:Captchahelp-text/de" title="MediaWiki:Captchahelp-text/de">Deutsch</a> | <a href="/wiki/MediaWiki:Captchahelp-text" title="MediaWiki:Captchahelp-text">English</a> | <a href="/wiki/MediaWiki:Captchahelp-text/es" title="MediaWiki:Captchahelp-text/es">Español</a> | <a href="/wiki/MediaWiki:Captchahelp-text/fr" title="MediaWiki:Captchahelp-text/fr">Français</a> | <a href="/wiki/MediaWiki:Captchahelp-text/gl" title="MediaWiki:Captchahelp-text/gl">Galego</a> | <a href="/wiki/MediaWiki:Captchahelp-text/it" title="MediaWiki:Captchahelp-text/it">Italiano</a> | <a href="/wiki/MediaWiki:Captchahelp-text/hu" title="MediaWiki:Captchahelp-text/hu">Magyar</a> | <a href="/wiki/MediaWiki:Captchahelp-text/ja" title="MediaWiki:Captchahelp-text/ja">日本語</a> | <a href="/wiki/MediaWiki:Captchahelp-text/nl" title="MediaWiki:Captchahelp-text/nl">Nederlands</a> | <a href="/wiki/MediaWiki:Captchahelp-text/nds" title="MediaWiki:Captchahelp-text/nds">Plattdüütsch</a> | <a href="/wiki/MediaWiki:Captchahelp-text/oc" title="MediaWiki:Captchahelp-text/oc">Occitan</a> | <a href="/wiki/MediaWiki:Captchahelp-text/sl" title="MediaWiki:Captchahelp-text/sl">Slovensko</a> | <a href="/wiki/MediaWiki:Captchahelp-text/zh" title="MediaWiki:Captchahelp-text/zh">简体中文</a> | <a href="/wiki/MediaWiki:Captchahelp-text/zh-hk" title="MediaWiki:Captchahelp-text/zh-hk">正體中文</a> | <small class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/w/index.php?title=MediaWiki:Captchahelp-text/Lang&action=edit">+/−</a></small> </small> </p><p>Web sites that accept postings from the public, like this wiki, are often abused by spammers who use automated tools to post their links to many sites. While these spam links can be removed, they are a significant nuisance. </p><p>Sometimes, especially when adding new web links to a page, the wiki may show you an image of colored or distorted text and ask you to type the words shown. Since this is a task that's hard to automate, it will allow most real humans to make their posts while stopping most spammers and other robotic attackers. Another test is to ask you to type in the answer to a simple arithmetic problem. <b>You must have <a rel="nofollow" class="external text" href="http://www.google.com/cookies.html">cookies enabled</a> in your browser, otherwise your answers to these tests will not be accepted.</b> </p><p>Unfortunately this may inconvenience users with limited vision or using text-based or speech-based browsers. At the moment we do not have an audio alternative available. Please contact the site administrators for assistance if this is unexpectedly preventing you from making legitimate posts at the <b><a href="/wiki/Commons:Help_desk" title="Commons:Help desk">Commons:Help desk</a></b>. 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