Top 10 Free Keyword Research Tools for SEO Campaigns
A good SEO expert doesn't have to pay for keyword research tools. Here's a checklist of the top 10 keyword research tools that are free and perfect for SEO experts and your next SEO campaign.

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Google Keyword Planner - Enter your web address to find keywords and related keywords with estimated search volume. It's 1st because...it's Google. https://goo.gl/ooy2WQ
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Soovie - is a fast, free, and a great place to start researching ideas. Enter a keyword and this free keyword tool will automatically display keyword suggestions. http://www.soovle.com
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Uber Suggest is a fast and free keyword suggestion tool. Solid results. Get great ideas. A great place to start your research. https://ubersuggest.io
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LSI Keyword Generator - Latent Semantic Indexing for determining the relationship between terms and concepts in content. http://lsigraph.com
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SERPs is a solid, free, and quick keyword research tool. It uses Adwords data to suggest organic and paid keywords. https://serps.com/tools/keyword-research
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Google Correlate - Enter a keyword and find new keywords that Google considers very similar. https://www.google.com/trends/correlate
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Keyworddit uses Reddit to find keywords. http://www.keyworddit.com
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Spy Fu has been around a for while and still offers solid keyword research for free, along with a paid option as well. https://www.spyfu.com/keyword/overview
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Keyword Tool - Find keyword suggestions for Google, Youtube, eBay, Amazon and the App store. 750 suggestions are free. https://keywordtool.io
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Wordstream has decent keyword ideas. The free version let's you see Google search volume estimates. http://www.wordstream.com/free-keyword-tools
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Bonus: Try Starting Your Keyword Research Here
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Bloomberry - Enter a keyword and find the most popular questions asked by your buyers. Includes: forums, e-commerce sites, Quora, reddit and more. http://bloomberry.com
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Buzzsumo enter a keyword to find content getting the most links and shares. Start your keyword research here. Free trial, but worth paying. http://buzzsumo.com
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Google Trends visually shows you what and where keyword are trending. Another good place to get keyword ideas. https://trends.google.com/trends
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SEM Rush gives in-depth info about keywords including related, competitors, ad data, and difficulty. Free trial and paid versions. https://www.semrush.com/info/empty/phrase_overview