To optimize your website for search engines, you need a variety of tools to monitor performance and discover opportunities. Fortunately, many of those tools are free.
Here is a list of free search-engine-optimization tools. There are tools for keyword analysis, link checking and building, site testing, competitive review, and more. All of these tools are free, though some offer additional premium features.
Free SEO Tools
Varvy SEO Tool. The most basic step of SEO is to follow the Google guidelines. This tool checks if your site follows the guidelines and offers fixes.
Browseo. Browseo is a tool for browsing pages through the eyes of a search engine. View your web page without the distractions caused by style. It also highlights the parts of a page that are relevant for SEO and provides a spreadsheet download of your session.
Google Keyword Planner. Google Keyword Planner is an essential tool to discover search query volume estimates. Get historical statistics, see how a list of keywords might perform, and create new keyword lists by merging several lists of keywords together.
Übersuggest. Übersuggest is a research tool to quickly find new keywords not available in the Google Keyword Planner. Copy and paste your keywords in a spreadsheet or download them as a CSV file.
Search Latte. Search Latte is a tool to build international Google searches. Enter your keyword, then enter any combination of top-level domain, country, and language.
SEO Spider. The Screaming Frog SEO Spider allows you to quickly crawl, analyze, and audit a site from an onsite SEO perspective. View, analyze, and filter the crawl data as it’s gathered and updated continuously.
SEOCentro. SEOCentro provides a variety of SEO tools to monitor your site’s performance, including SEO analyzer, meta tag analyzer, rank checker, keyword analyzer, and social media shares.
Check My Links. Check My Links is a Chrome extension that quickly finds all the links on a web page, and checks each one for you. It highlights which ones are valid and which ones are broken.
GTmetrix. Determine the speed of your site with a tool that actually loads it. Get load time, page size, total requests, playback, and more. Monitor your pages, set alerts, and get actionable recommendations. Monitor up to three URLs with a free basic account. Pro plans start at $14.95 per month.
Map Broker XML Sitemap Validator. Here is a free tool that verifies if you have a valid sitemap and checks if the links in your sitemap work.
Open SEO Stats. This is a Chrome extension to access the Google PageRank, Alexa Rank, Compete Rank, and Quantcast Rank of the current web page, in addition to getting info on backlinks, indexed pages, cached pages, socials, Whois, Geo IP location, and more.
Link Prospecting Query Builder. Enter a keyword, and select the link type you want to prospect. The tool will render a search list for your favorite link-prospecting tool.
Google Analytics Referrer Spam Killer. This is a free tool to keep your Google Analytics data and statistics as clean as possible by filtering out spammy referrer domains.
Google Mobile-Friendly Test. This test analyzes a URL and reports if the page has a mobile-friendly design. Make sure your site is not penalized because it’s not mobile friendly.
Zadro Web SEO Auditor. This tool provides a variety of helpful facts and metrics, including Google page speed and PageRank, page authority and domain authority from Moz, your top ten keywords by SEMrush, social links, and more.
SEO Book Tools. SEO Book offers a variety of free SEO tools as web apps and browser extensions — including keyword suggestions, meta tag generator, link suggestions tool, spider test tool, and typo generator.
Seoptimer. Seoptimer is a daily use tool to get a quick look at over 20 SEO factors on your website.
SEOquake. SEOquake is for Firefox, Chrome, and Opera browsers. Get a site’s information on a wide range of parameters such as PageRank, Google index, Alexa ranking, keyword density, and more. Get the values of the parameters under each search result of Google, Yahoo, Bing, Yandex, and Baidu.
SEO Chat Suggestion Keyword Finder. Here is a keyword generator that provides multiple levels of suggestions related to your original keyword.
SEMrush. SEMrush’s free tools provide insights into a site’s performance, including organic and paid search, backlinks, top organic keywords, organic competitors, and competitive positioning. The Basic plan is free. The Pro plan is $69.95 per month.
Moz Open Site Explorer. This free tool from Moz allows you to gauge a site’s influence. See inbound links to the page, subdomain, or root domain you’ve entered, and then analyze the linking pages.
Google PageSpeed Insights. PageSpeed Insights analyzes the content of a web page, then generates suggestions to make that page faster.
LinkMiner. This Chrome extension checks web pages for broken links and pulls metrics on those links. Get link and social data on any URL on a page, display link data next to each link, and export link data.
Google Disavow Tool. If you believe your site’s ranking is being harmed by low-quality links you don’t control, ask Google to ignore them when assessing your site.
Yoast SEO WordPress Plugin. Yoast SEO is a plugin for WordPress.org users. It incorporates everything from a snippet editor and real-time page analysis that helps you optimize your page content, meta descriptions, sitemaps, and more. Basic is free. Premium is $69.
Panguin Tool. Here is a tool to monitor your rankings when Google changes its search algorithms.