The Only 30 Free SEO Tools You Need

The Only 30 Free SEO Tools You Need

Si Quan Ong
Content marketer @ Ahrefs. I've been in digital marketing for the past 6 years and have spoken at some of the industry’s largest conferences in Asia (TIECon and Digital Marketing Skill Share.) I also summarise books on my personal blog.
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    Looking for a list of free, useful SEO tools? Then look no further.

    You don’t need every free SEO tool under the sun. You just need enough of them to cover your use cases.

    After a few years in SEO and content marketing, I’ve found these free SEO tools are all you need.

    Monitor your website’s SEO health, see who’s linking to your website, and learn what your website is ranking for on Google 

    Except of AWT's page

    Before you hire an interior designer to beautify your house, the foundation of your house needs to be rock-solid. The same goes for your website. Before you go about optimizing your website, you need to make sure its technical health is strong.

    Run a comprehensive crawl of your website with Ahrefs Webmaster Tools (AWT) to check for over 100 common SEO issues.

    You’ll also be able to see who’s linking to your website and learn what keywords you’re currently ranking for.

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    This tool doesn’t just tell you what problems your site has. It’ll also tell you why a particular thing is a problem and how you can fix it.

    Page showing the issue and how to fix it

    See the top 100 keyword ideas for any seed keyword, as well as related search data

    ahrefs free keyword generator

    Our free keyword research tool shows you the top 100 keyword ideas for any keyword or phrase, plus the top 50 related questions. It also shows you important keyword data, such as search volume and keyword difficulty.

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    Besides Google, you can see keywords for other important search engines like YouTube, Bing, and Amazon. Just select the search engine you want data for:

    Google’s keyword research tool

    Google's GKP: table showing list of keywords with corresponding data

    Designed for keyword research for Google Ads, Google Keyword Planner (GKP) is an invaluable tool in an SEO’s toolbox. This is mainly because the tool is from Google itself, and many SEOs believe its data is the most accurate.

    But in our experiment, we found that GKP almost always overestimates “true” search volume and is only roughly accurate 45.22% of the time.

    Another limitation is that GKP doesn’t show absolute search volumes—only a range (as you can see in the screenshot above). Nevertheless, it’s still a useful tool if you want to cover all your bases when it comes to keyword research.

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    Most keyword research tools show you ideas based on the seed keyword you entered. For example, if you search for “coffee,” you’ll get ideas like “coffee bean,” “coffee near me,” “coffee shops,” “keurig coffee maker,” etc.

    GKP, on the other hand, can show you relevant keywords based on semantics. For example, you can see that GKP suggests keywords like “cappuccino,” “espresso,” “barista,” and “french press” even though they don’t contain the word “coffee.”

    List of keywords and corresponding average monthly searches

    Recommended reading: How to Use Google Keyword Planner (Actionable Guide)

    Find People Also Ask questions

    AlsoAsked tool

    For almost every query you search for on Google, you’ll see a SERP feature known as People Also Ask (PAA).

    PPA box with list of questions

    AlsoAsked scrapes them and shows you the PAA questions related to the topic you’ve entered. Use these to find subtopics and questions that may be worth answering in your article.

    For example, if you are writing an article about “how to clean a coffee maker using vinegar,” you may want to answer these questions:

    Hierarchy of questions connected by flowlines

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    When you click on a PAA question in Google, more PAA questions pop up:

    More questions in PAA box

    AlsoAsked allows you to go deeper into this research (but you’ll have to sign up for a paid plan):

    Drop-down showing options "Standard search depth" and "Deep search"

    Recommended reading: How to Rank in ‘People Also Ask’ Boxes and If You Should

    Do keyword research on Reddit

    Keyworddit research tool

    Keyword research is about finding the topics your audience is looking for. So what better way than to find the topics people are discussing on one of the internet’s largest “forums,” aka Reddit?

    Enter the name of a subreddit your audience is participating in. Keyworddit will then extract keywords from that community.

    For example, here’s a list of keywords it grabbed from the r/bodyweightfitness subreddit:

    List of keywords with corresponding data

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    Keyworddit also shows you the context where the keyword appeared:

    Gif showing that clicking on "Context" shows where the keyword appeared

    See search trends from all around the world

    google trends

    Google Trends shows the popularity of a topic over time.

    Use it to catch and capitalize on trending topics, as well as avoid creating content about those with waning interest.

    one piece google trends in united kingdom

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    Google Trends also shows you related topics and queries that are rising in popularity:

    related topics and queries in google trends

    Cover these topics before other sites do.

    Recommended reading: How to Use Google Trends for Keyword Research: 7 Effective Ways

    WordPress SEO plugin for on-page and technical SEO

    Excerpt of RankMath's page

    Imagine if you had to add your title tags, meta descriptions, OG tags, and other meta tags by yourself using code for every post you publish. You’d flip out, wouldn’t you?

    But if you’re using WordPress, you don’t have to do that. RankMath helps you add all of those easily:

    RankMath showing added title, permalink, etc

    Besides that, RankMath also helps with:

    And more.

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    RankMath has a comprehensive schema markup library that you can add to your posts:

    List of schema types

    See how your page will look like on the SERPs

    Google's SERP snippet optimization tool

    Enter your proposed title, meta description, and URL. This tool will then show you what your webpage will potentially look like in the search results.

    Preview of how webpage looks like on the SERP

    You can already do this if you’re using a WordPress plugin like RankMath. But it’s useful if you’re not using WordPress.

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    Check the Rich Snippet and Date radio buttons to see what they look like on the SERPs:

    Preview of how webpage looks like on the SERPs with ratings

    Create structured data markup in the JSON-LD format

    Schema markup generator for JSON-LD format

    Schema markup helps search engines better understand your content. It also powers rich snippets, which often have higher click-through rates than “regular” search results.

    Merkle’s Schema Markup Generator helps you create the right schema code. Select the type of schema markup you want to generate, e.g., local business, FAQ, product, etc., fill in the form, then copy and paste the generated markup onto your site.

    You can do this if you’re already using a WordPress plugin like RankMath. But if you aren’t, this is a good tool to use.

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    This is not a specific feature of the tool. But once you’ve generated your schema markup, you can check its validity using’s Markup Validator.

    Recommended reading: What Is Structured Data? And Why Should You Implement It?

    Multi-feature browser extension that provides SEO data about the pages and websites you visit

    ahrefs toolbar

    With Ahrefs’ SEO Toolbar, you can see the valuable SEO data of any webpage you visit. These include the following:

    • Page’s title
    • Meta description
    • Dates when page was published and modified
    • Word count
    • Headings
    • Hreflang tags
    • Canonicals
    • OG tags

    And more.

    Besides that, the tool also:

    • Checks for broken links.
    • Traces redirect chains (full path).
    • Highlights nofollow links.

    And much more.

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    If you have an Ahrefs subscription, you can see our metrics within the SERPs themselves:

    see ahrefs metrics within serps

    See the top 100 backlinks to any website or webpage

    Ahrefs free backlink checker

    One of the most common activities in link building is to pursue your competitors’ links. By that, we mean looking at your competitors’ links and figuring out how they’ve been acquiring theirs. Then you can potentially mirror their tactics.

    To do that, you’ll need to see who’s linking to them in the first place. What you can do is enter the URL of the page you’re competing with into our free backlink checker.

    You’ll see the top 100 backlinks pointing to that page:

    Free backlink checker results

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    This tool also shows you the five most linked pages, most common anchor texts, the total number of backlinks and referring domains, and our proprietary Domain Rating (DR) scores.

    These are all important information that can help you formulate your link building strategy.

    Recommended reading: 7 Actionable Ways to Loot Your Competitors’ Backlinks 

    Find email addresses tool

    Most link building tactics involve reaching out and persuading someone to link to your page. For that to happen, you’ll need their email address. allows you to find anyone’s professional email address. Just enter the domain of the email address you’re looking for, and the tool will show you the list of email addresses it’s found:

    Search term "" entered; below, list of email addresses

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    If you’re doing link building at scale, you can use’s bulk email finder to find and verify email addresses in one shot.

    Learn how to do this in this video:

    Recommended reading: 6 Ways To Find Anyone’s Email Address (Tried & Tested) 

    Free service that connects news sources with journalists looking for expertise

    Excerpt of Haro's page

    Here’s how this works:

    1. Journalists have questions and need experts to answer them.
    2. HARO sends emails with those questions to their subscribers.
    3. Anyone can respond and potentially become a source for the journalists’ publications.

    It doesn’t matter whether you’re starting out or have an established site; this is a great way to build authoritative links.

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    This is not a HARO feature. But signing up for HARO means you’ll begin receiving many emails from HARO a day. You’ll want to narrow down all the emails you receive from HARO to only those that are relevant to your work.

    To do this, you’ll need to create a Gmail filter. Here’s how:

    1. Hit the caret on the right side of the search bar
    2. Paste [email protected] (or another feed) into the “from” field
    3. Add your keywords (using the OR separator) to the “Includes the words” field and use quotation marks to consider multiple words as one keyword
    Options to customize Gmail filter

    Recommended reading: 9 Great Public Relations Tactics With Campaign Examples

    Free tool from Google that helps you monitor and troubleshoot your website’s appearance on the SERPs

    GSC overview page for Ahrefs' blog

    Use Google Search Console to find and fix technical errors on your website, submit sitemaps, see structured data issues, check your Core Web Vitals, and more.

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    The URL Inspection tool provides information about Google’s indexed version of a specific page. Enter any URL and see if there are issues with it:

    URL Inspection tool showing all's OK for a specific page on Ahrefs' blog

    If you’re advanced enough, you can even use the URL Inspection API to bulk-check your data.

    Recommended reading: How to Use Google Search Console to Improve SEO (Beginner’s Guide) 

    Free global CDN

    Except of Cloudflare's page

    A content delivery network (CDN) is a globally distributed server network that makes it quicker for users to access your website. It caches static content across its servers so that it can get content to load faster by serving it from a location near the visitor.

    Use Cloudflare to speed up your website and protect it from malicious attacks.

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    Cloudflare automatically provides a free SSL certificate for your website. This is important because HTTPS protects your site and is a Google ranking factor.

    Analyze the loading speed of your webpages

    Excerpt of GTmetrix's page

    Page speed has been a Google ranking factor since 2010. So if your site is extremely slow, this may be a reason why it’s not ranking as well as it can be.

    Use GTmetrix to check your page speed and see how the page is performing:

    Results of page speed test showing GTmetrix grade and CWV data

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    GTmetrix also shows you the top issues affecting your site, plus recommendations on how to improve them:

    Top issue and recommendation to solve said issue

    Recommended reading: How to Improve Page Speed From Start to Finish (Advanced Guide)

    Optimize your images

    Except of ShortPixel's page; on right, "before compression" and "after compression" versions of a picture of a bird

    Large images (in terms of file sizes) can take a longer time to load and, therefore, impact your page speed. Google even has extensive documentation on how to optimize your images for the web:

    For best results, experiment with various quality settings for your images, and don’t be afraid to dial down the quality—the visual results are often very good and the filesize savings can be quite large.

    You can use ShortPixel to compress, optimize, and resize your images.

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    ShortPixel automatically optimizes your media library:

    Message stating all pictures have been optimized

    Recommended reading: Image SEO: 12 Actionable Tips (For More Organic Traffic) 

    Create a properly formatted robots.txt file

    Excerpt of Robots.txt Generator's page

    A robots.txt file tells search engines where they can and can’t go on your site. Primarily, it lists all the content you want to lock away from search engines like Google.

    If you don’t yet have a robots.txt file on your website, use this tool to quickly create one.

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    If you’re an advanced user, choose “Customize” to create individual rules for various bots, subdirectories, etc.:

    Page to create individual rules

    Recommended reading: Robots.txt and SEO: Everything You Need to Know 

    Generate hreflang tags to specify the language and geographical targeting of a webpage

    Page showing hreflang tag generator

    Hreflang is an HTML attribute used to specify the language and geographical targeting of a webpage.

    If you have multiple versions of the same page in different languages, you can use the hreflang tag to tell search engines like Google about these variations. This helps them to serve the correct version to their users.

    Use this tool to generate the correct hreflang tags for your website. Just add your desired URLs, select your target country and language, then click “Generate.”

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    You can bulk-upload URLs (max: 50) onto the tool. Just click “Choose file” and upload your CSV file.

    Recommended reading: Hreflang: The Easy Guide for Beginners 

    See how the browser renders a page

    Page showing three columns: raw HTML, rendered HTML, and what the differences are

    This shows how the browser has rendered a page’s original HTML into the DOM, including modifications made by JavaScript.

    It’s a great tool for those who need to audit or troubleshoot JavaScript issues.

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    View Rendered Source shows the differences between the raw version of your code and what is rendered.

    Page showing three columns: raw HTML, rendered HTML, and what the differences are

    Recommended reading: JavaScript SEO: What You Need to Know 

    See the top 10 ranking pages for any keyword

    Ahrefs free SERP checker

    Google personalizes search results based on factors such as your location, language, and search history. As such, search results may differ widely, depending on the location you search from.

    Use our free SERP checker to see real-time search results so that you can get the most accurate SERPs in the location you want to rank for.

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    For the first three search results, you’ll also see important SEO metrics like the number of referring domains, number of backlinks, estimated search traffic, etc.

    This is helpful for assessing the top-ranking pages and understanding why these pages are ranking where they are.

    SERP Overview from Ahrefs free SERP checker

    See search results from any location

    BrightLocal's local SERP checker tool

    If you’re doing local SEO, you’ll want to see even more granular search results—right down to the city, town, or even ZIP level. You can use BrightLocal’s Local SERP Checker for that.

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    Depending on the country, you can even specify the language:

    Drop-down to choose language

    Google’s analytics tool

    "Home" page of Google's analytics tool

    Google Analytics is quite likely the most used analytics tool out there. It’s no wonder—not only is it free, but it’s also powerful. It gives you a whole range of data for your website, which you can parse and dissect to improve almost every aspect of your marketing.

    So rather than pinpoint a particular feature I like (which seems almost impossible), read the article recommended below to see how you can use Google Analytics to improve your SEO performance.


    Note that Google is replacing the current version of Google Analytics with Google Analytics 4 (GA4). From July 1, 2023, onward, Universal Analytics (the current version) will no longer process data, and data will only flow into GA4.

    If you already have Google Analytics, make sure you set up GA4.

    Recommended reading: How to Use Google Analytics to Improve SEO Performance 

    Create interactive dashboards and reports

    Interactive dashboards: on left, a line graph; on right, a map

    Whether you’re an in-house SEO or an SEO agency, you’re probably creating SEO reports for your clients, managers, and bosses. Google Data Studio helps make such reporting easier.

    Since it integrates with Google’s suite of tools, it is relatively easy to merge data from places like Google Search Console, Google Analytics, etc.

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    You can even add data from SEO tools like Ahrefs.

    Recommended reading: Steal Our SEO Report Template (Inspired by SEO Experts) 

    Run a content audit of your website

    Page showing results of content audit. On left, performance score with explanation below; on right, pie chart showing no. of pages that are performing well, not performing well, etc

    Not every piece of content you publish will be successful. That’s OK. You can always revisit it, figure out what went wrong, and take action to improve its performance.

    But to do that, you’ll need to find the underperforming pages. That’s when you do a content audit.

    Our SEO WordPress plugin automates the content audit process and kicks back recommendations to you.

    List of pages and corresponding data that shows who the author is, categories, recommendations, etc

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    Click the suggestions, and we’ll give you a recommendation on what to do next:

    List of recommended actions with explanation below each action

    Recommended reading: How to Do a Content Audit in 2022 

    Manage how your local business appears on Google Search and Maps

    Except of GBP's page

    According to BrightLocal’s survey, 36% of SEOs think a Google Business Profile is the most important ranking factor for the map pack. And 6% believe that it’s important for the “regular” organic results.

    Bar graph showing percentage of SEOs who think GBP is most important ranking factor for "map pack" and "regular" results, respectively

    So if you’re running a local business, make sure you have your Google Business Profile set up.

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    BrightLocal’s 2021 study shows that 17% of SEOs deem reviews the most important ranking factor for “map pack” rankings.

    Use your Google Business Profile to create and share review links so that you can get more reviews for your local business.

    Recommended reading: How to Optimize Your Google My Business Listing in 30 Minutes 

    See how pages looked like in the past

    Except of Wayback Machine's page

    The Wayback Machine takes historical screenshots of pages and stores them in its database. You can then enter any URL to see those webpages’ previous versions (even currently broken ones).

    This is useful for a variety of tasks. For example, if you’re doing broken link building, it is helpful to see what was originally on the dead page so that you can replicate it.

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    If your competitors are constantly making changes or updating their pages (and, in the process, outranking you), you can also enter their URL into the Wayback Machine to see what sections or subtopics they’ve added.

    Recommended reading: 5 Ways to Use the Wayback Machine for SEO

    Monitor mentions of your name or business online

    Text field to enter term to create an alert about

    Use this tool to set up mentions of your name or business. Depending on the frequency you choose, Google Alerts will then send you an email with all the pages that have mentioned the term you’re tracking.

    Page to set up alerts

    You can also use it to monitor your competitors.

    Highlighted feature

    Use Google Alerts to monitor unlinked mentions. Unlinked mentions are mentions of your brand, products, or services that don’t link to you. Those are wasted opportunities.

    Set up multiple Google Alerts for all your brand-related terms. For example, we can track:

    You can consider setting up Google Alerts for common misspellings too! One of our examples is “aherfs.”

    When you receive the email from Google Alerts, check out the pages, view the source code (right-click > view page source), and search for using CTRL/CMD+F. If there are no results, that means there are no links back to you.

    Consider reaching out to the writer or webmaster and see if they can add a link back to your site.

    Recommended reading: How to Set Up Google Alerts (And Use It to Grow Your Business) 

    World’s most used search engine

    Google's page to key in search term

    Even with so many free SEO tools available, you can’t forget about Google—arguably the most powerful SEO tool.

    You can use Google to do a variety of SEO tasks. For example, you can use Google to figure out what the search intent is so that you can align your page with it.

    Let’s say you want to rank for the keyword “best french press.” If we search for the term on Google, we’ll see that searchers want to learn, not buy. Specifically, they want to see comparisons of all the best and most up-to-date French presses:

    Google SERP for "best French press"

    If you run a coffee blog and want to rank for this keyword, it’s likely you’ll have to follow suit.

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    You can use Google search operators to find guest post opportunities, internal linking opportunities, link prospects, and more.

    Learn about some powerful ways to use Google for SEO in our extensive guide to Google search operators.

    Converse with an AI chatbot about almost anything in the world


    I’m sure I don’t need to explain ChatGPT. Everybody, from students to professors, from marketers to programmers, are using ChatGPT in their work and daily lives.

    You can prompt ChatGPT to do almost anything: answer questions, create content, pretend to be someone else, start a business, fix your code, and more.

    Highlighted feature

    Using ChatGPT well (at least in its current form) requires you to use the right prompts.

    Learn the best prompts to use in our guide to ChatGPT for SEO.

    Learn more

    Still looking for more SEO tools? Check out some of these articles:

    Article Performance
    Data from Ahrefs
    • 20.79K
      Organic traffic
    • 661
      Linking websites

    The number of websites linking to this post.

    This post's estimated monthly organic search traffic.