On-Page
35 checks, ordered by severity.
No viewport meta tagviewport_meta_tag_missingTitle tag missing from the server-rendered HTMLmissing_title_tagMeta description missing from the server-rendered HTMLmissing_meta_descriptionPage regions not marked up with semantic HTML5key_regions_useSession ID exposed in the URLurl_session_id_parameterNo language declared on the html elementhtml_lang_xxDuplicate title tags across pagesevery_unique_titleDuplicate meta descriptions across pagesevery_unique_metaReferrer policy meta tag is empty or invalidmeta_name_referrerViewport meta tag missing a required directiveviewport_meta_tag_incompletePage has no H1 headingh1_heading_missingNo character encoding declaredcharset_declaration_missingCharacter encoding declared as something other than UTF-8charset_declaration_not_utf8URLs with uppercase letters, underscores or spacesstructure_clean_lowercaseFigure elements missing a figcaptionfigure_figcaption_wrapURL path containing repeated slashesurl_multiple_slashesMore than one title tag in the headmultiple_title_tagsMore than one meta description tagmultiple_meta_descriptionsInconsistent trailing slashes across URLstrailing_slash_consistencyRobots meta tag missing snippet and preview directivesmeta_name_robotsNo author meta tagmeta_name_authorNo content-language declarationmeta_http_equivHeading levels skipped in the document outlineheading_levels_skippedH1 heading is emptyempty_h1_headingSame H1 used on several pagesduplicate_h1_across_pagesURL longer than 115 charactersurl_over_115_charactersURL carrying more than three query parametersurl_excessive_parametersURL containing non-ASCII charactersurl_non_ascii_charactersTitle wider than the 561-pixel search resulttitle_pixel_widthMeta description wider than the 985-pixel snippetmeta_description_pixel_widthTitle tag identical to the H1title_matches_h1No Google Search Console verification tagmeta_name_googleMore than one H1 headingmultiple_h1_headingsTitle outside the recommended length (50–60 characters)title_lengthMeta description outside the recommended length (150–160 characters)meta_description_length