{"id":33886,"date":"2020-07-16T14:57:47","date_gmt":"2020-07-16T14:57:47","guid":{"rendered":"https:\/\/devobility.net\/blog\/new-seobility-feature-file-source-analysis\/"},"modified":"2026-01-15T15:51:51","modified_gmt":"2026-01-15T15:51:51","slug":"file-source-analysis","status":"publish","type":"post","link":"https:\/\/www.seobility.net\/en\/blog\/file-source-analysis\/","title":{"rendered":"New Seobility Feature: File Source Analysis"},"content":{"rendered":"<p>The correct use of file sources on your website is essential for properly displaying your content to users and to make sure that Google can index your website completely. Issues with these files will not only affect user experience and indexation in a negative way but can also result in longer page load times &#8211; an <strong>important Google ranking factor<\/strong>!<\/p>\n<p>This is why we added a new set of checks to Seobility which analyze all files used on your website. In other words, we will now not only analyze the HTML code of your web pages but also <strong>images as well as CSS and JavaScript files<\/strong>.<\/p>\n<p>In this article, we will have a closer look at the new Seobility feature and show you how it can help to optimize the display and load times of your website!<\/p>\n<h2>File Source Analysis &#8211; Overview<\/h2>\n<p><b>Note:<\/b> The File Source Analysis feature is not yet activated automatically. In order to use it, you will need to set a \u201c<em>Maximum number of file sources<\/em>\u201d in the Crawler settings of your Seobility project.<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2750 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/maximum-number-of-file-sources.png\" alt=\"set a maximum number of file sources in your crawler settings\" width=\"1027\" height=\"473\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/maximum-number-of-file-sources.png 1027w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/maximum-number-of-file-sources-768x354.png 768w\" sizes=\"(max-width: 1027px) 100vw, 1027px\" \/><\/p>\n<p>Once you started a new crawling, you will find the analysis here:<\/p>\n<p><i>Onpage &gt; Tech. &amp; Meta<\/i><\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2751 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/tech-and-meta.png\" alt=\"file source analysis under tech and meta\" width=\"1057\" height=\"786\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/tech-and-meta.png 1057w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/tech-and-meta-768x571.png 768w\" sizes=\"(max-width: 1057px) 100vw, 1057px\" \/><\/p>\n<p>(From August the feature will be activated automatically.)<\/p>\n<p>Let\u2019s start with a quick introduction of the factors we analyze. In the next section, you will learn how to use the new feature for optimizing your website.<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2752 contentimage\" style=\"float: none;\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/file-source-analysis-1.png\" alt=\"file source analysis - analyzed factors\" width=\"514\" height=\"343\" \/><\/p>\n<ul>\n<li><strong>Crawled file sources:<\/strong> This will give you an overview of all media and files that the Seobility crawler found on your website.<\/li>\n<li><strong>Non-retrievable file sources:<\/strong> Lists all files that could not be retrieved for various reasons.<\/li>\n<li><strong>File sources excluded by robots.txt:<\/strong> These are files that are blocked in your robots.txt file and thus can\u2019t be accessed by our crawler.<\/li>\n<li><strong>Non HTTPS content on HTTPS pages:<\/strong> Here you will find a list of all pages that are encrypted for transfer via HTTPs but link to unsafe files (non HTTPS content).<\/li>\n<li><strong>Issues with file sources:<\/strong> This analysis checks your files for several problems such as missing compression, long loading times, or redirects.<\/li>\n<li><strong>Too many files within a page:<\/strong> Lists all subpages that contain a high number of media and files.<\/li>\n<\/ul>\n<p>Now let\u2019s get to the interesting part: How can this new feature help with your SEO?<\/p>\n<h2>How to use the File Source Analysis feature for SEO<\/h2>\n<p>The new File Source Analysis can help you improve three important aspects of your website: the correct display to users and Google, website security, and <a href=\"https:\/\/www.seobility.net\/en\/blog\/page-speed-optimization\/\" target=\"_blank\">page speed optimization<\/a>.<\/p>\n<h3>Correct display of your website to users and Google<\/h3>\n<p><strong>In order to ensure a positive user experience<\/strong>, all of your content has to be displayable to website visitors without errors. Nobody likes surfing on a website with broken images or faulty layout due to errors in CSS files.<\/p>\n<p>For <strong>Googlebot<\/strong> it\u2019s also important that it can <strong>access all of your content<\/strong> for indexation. Therefore, the Seobility site audit now includes a report of all files that could not be accessed by our crawler. The reasons for that (e.g. status code 404) are listed as well:<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2753 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/Non-retrievable.png\" alt=\"non retrievable file sources\" width=\"1058\" height=\"524\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/Non-retrievable.png 1058w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/Non-retrievable-768x380.png 768w\" sizes=\"(max-width: 1058px) 100vw, 1058px\" \/><\/p>\n<p>In addition, the analysis \u201c<em>File sources excluded by robots.txt<\/em>\u201d will list all files that have been excluded from crawling in your <a href=\"https:\/\/www.seobility.net\/en\/wiki\/robots-txt\" target=\"_blank\" rel=\"noopener noreferrer\">robots.txt file<\/a>. If you haven\u2019t explicitly blocked these files for the Seobility crawler, they probably aren\u2019t accessible for Google either. Thus, this list should not contain any files that are necessary for the correct display of your website. Necessary files would be CSS files that define your website\u2019s layout on mobile devices. Google renders these files in order to check your <a href=\"https:\/\/www.seobility.net\/en\/wiki\/Mobile_Optimization\" target=\"_blank\" rel=\"noopener noreferrer\">mobile optimization<\/a> which is an important ranking factor!<\/p>\n<h3>Website security<\/h3>\n<p>The analysis \u201c<em>Non HTTPS content on HTTPS pages<\/em>\u201d already existed before our software update (under \u201cPage optimization and guidelines\u201d), but now became part of the new File Source Analysis. It lists all pages that are encrypted for transfer via HTTPS but contain unsafe files (non HTTPS content).<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2754 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/non-https-content.png\" alt=\"non https content on https pages\" width=\"1055\" height=\"456\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/non-https-content.png 1055w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/non-https-content-768x332.png 768w\" sizes=\"(max-width: 1055px) 100vw, 1055px\" \/><\/p>\n<p>This issue will lead to web browsers displaying a warning message even though your web page uses HTTPS. This can irritate users and make your website seem less trustworthy. In addition, <a href=\"https:\/\/webmasters.googleblog.com\/2014\/08\/https-as-ranking-signal.html\" target=\"_blank\" rel=\"noopener noreferrer\">HTTPS is an important ranking signal<\/a>, so you should definitely eliminate these issues. Our <a href=\"https:\/\/www.seobility.net\/en\/blog\/switch-from-http-to-https\/\" target=\"_blank\" rel=\"noopener noreferrer\">HTTP to HTTPS migration guide<\/a> explains how to switch your whole website, including all files, to HTTPS.<\/p>\n<h3>Pagespeed optimization<\/h3>\n<p><a href=\"https:\/\/www.seobility.net\/en\/wiki\/Page_Speed\" target=\"_blank\" rel=\"noopener noreferrer\">Page speed<\/a> (or page load time) is an important Google ranking factor! There are multiple issues that can slow your site down (checked in the reports \u201c<em>Issues with file sources<\/em>\u201d and \u201c<em>Too many files within a page<\/em>\u201d):<\/p>\n<h4>Large file size<\/h4>\n<p>If the files used on a web page are very big, it will take more time to fully load this page. Therefore, your image files shouldn\u2019t exceed a size of 2MB, for CSS and Javascript the maximum would be 0.5MB. In Seobility you can now check your website for files that are too big:<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2755 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/large-file-size.png\" alt=\"large file size issue\" width=\"1044\" height=\"173\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/large-file-size.png 1044w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/large-file-size-768x127.png 768w\" sizes=\"(max-width: 1044px) 100vw, 1044px\" \/><\/p>\n<p>In order to keep file size as small as possible, you should always save images in the right format. For example, JPEG is better suited for photos whereas PNG leads to small file sizes for screenshots and simple graphics. CSS files can be reduced by clearing them from unneeded style specifications. There are also minifier tools that help you reduce the code of CSS and JavaScript files.<\/p>\n<h4>Missing compression<\/h4>\n<p>If CSS and Javascript files are transferred without compression this will increase page load time. For this reason, you should always use compression such as gzip. In Seobility, we will list all files with missing compression:<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2756 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/missing-compression.png\" alt=\"missing compression issue\" width=\"1041\" height=\"218\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/missing-compression.png 1041w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/missing-compression-768x161.png 768w\" sizes=\"(max-width: 1041px) 100vw, 1041px\" \/><\/p>\n<h4>Redirects<\/h4>\n<p>File sources that redirect web browsers to another URL cause additional HTTP requests which in turn increase page load times. Therefore, you should always directly link to the ultimate file source.<\/p>\n<p>Here\u2019s an example: The file <i>example.com\/images\/image1.png<\/i> is used on a web page. When it is accessed by web browsers it redirects to <i>images.example.com\/image1.png<\/i>. Thus, an additional HTTP request has to be sent to the web server in order to retrieve the file. As this requires additional time, our tool now displays redirecting file sources as an error:<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2757 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/redirect.png\" alt=\"redirecting file sources\" width=\"1044\" height=\"229\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/redirect.png 1044w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/redirect-768x168.png 768w\" sizes=\"(max-width: 1044px) 100vw, 1044px\" \/><\/p>\n<h4>Too many files within a page<\/h4>\n<p>If a single web page uses a high number of file sources, this also increases the number of HTTP requests needed to load the full page. To improve page speed, you should merge all CSS and JavaScript files into one file each. In the analysis \u201c<em>Too many files within a page<\/em>\u201d, you can click on \u201c<em>Details<\/em>\u201d to get a list of all file sources found on a certain subpage:<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2758 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/too-many-files.png\" alt=\"too many files within a page\" width=\"1059\" height=\"486\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/too-many-files.png 1059w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/too-many-files-768x352.png 768w\" sizes=\"(max-width: 1059px) 100vw, 1059px\" \/><\/p>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-2759 contentimage\" src=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/file-sources.png\" alt=\"list of file sources\" width=\"1040\" height=\"331\" srcset=\"https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/file-sources.png 1040w, https:\/\/www.seobility.net\/wp-content\/uploads\/2020\/07\/file-sources-768x244.png 768w\" sizes=\"(max-width: 1040px) 100vw, 1040px\" \/><\/p>\n<h2>Any Questions?<\/h2>\n<p>We hope that our new feature will help you with the optimization of your website!<\/p>\n<p>Have you already had a look at the new File Source Analysis? We would love to hear your feedback in the comments!<\/p>\n<p>If you have any problems or questions about the new feature, you can always contact our support team: support@seobility.net.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"author\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Seobility\",\n    \"url\": \"https:\/\/www.seobility.net\/\"\n  }\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The correct use of file sources on your website is essential for properly displaying your content to users and to make sure that Google can index your website completely. Issues with these files will not only affect user experience and indexation in a negative way but can also result in longer page load times &#8211; [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":34650,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[21],"tags":[],"class_list":["post-33886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seobility-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>New Seobility Feature: File Source Analysis - Seobility Blog<\/title>\n<meta name=\"description\" content=\"Learn how the new File Source Analysis feature in Seobility can help you optimize important ranking factors such as page speed and website security.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.seobility.net\/en\/blog\/file-source-analysis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New Seobility Feature: File Source Analysis - 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