1. Ahrefs Webmaster Tools

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

2. Keyword Generator

Keyword Generator shows you the top 100 keyword ideas for any keyword or phrase you enter.

3. Google Keyword Planner

Google Keyword Planner (GKP) is Google's keyword research tool for Google Ads. But you can use it for SEO, too.

4. AlsoAsked

People Also Ask is a SERP feature that shows popular questions related to your search query. AlsoAsked pulls these questions and shows you all PAA questions related to your topic.

5. Keyworddit

Keyworddit extracts keywords from Reddit communities, which is a great way to find topics your audience is interested in.

6. Google Trends

Google Trends shows the popularity of a topic over time. You can use it to find and capitalize on trending topics and avoid creating content about those with waning interest.

7. Keyword Difficulty Checker

Keyword Difficulty Checker shows how difficult it would be to rank for a particular keyword, as measured by Ahrefs' Keyword Difficulty (KD) score.

8. RankMath SEO

RankMath lets you add title tags, meta descriptions, OG tags, and other meta tags to your pages and posts without messing around with code.

9. Google SERP Snippet Optimization Tool

This SERP Snippet Optimization tool shows how your webpage will potentially look in Google search results. Just enter your proposed title, meta description, and URL.

10. Merkle's Schema Markup Generator

Merkle's Schema Generator generates local business, FAQ, product, and other types of schema markup for you. This helps search engines better understand your content.

11. Ahrefs' SEO Toolbar

Detect on-page SEO issues as you browse the web.

12. Free Backlink Checker

Find backlink opportunities to any website or page.

13. Hunter

Find email addresses for link outreach.

14. Google Search Console

Monitor and troubleshoot your website's search performance.

15. Cloudflare

Speed up your website with a free CDN.

16. Pagespeed Insights

Evaluate the performance of your webpage.

17. Shortpixel

Shortpixel compresses, optimizes, and resizes images on your site automatically. This is useful because large images (in terms of file sizes) can take a longer time to load and therefore impact your page speed.

18. Robots.txt Generator

Robot.txt generator creates a robots.txt file for you, which tells search engines where they can and can't go on your site. It's a best practice for every website.

19. Hreflang Tag Generator

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

20. XML Sitemaps Generator

A sitemap is an XML file listing all the important content on your website. Any page or file that you want to show up in search engines should be in your sitemap. This tool creates one for you.

21. SERP Checker

See the top 10 ranking pages for any keyword.

22. Brightlocal's Local SERP Checker

See search results from any location.

23. Google Analytics

Google Analytics is a free tool that gives you a whole range of data for your website.

24. Google Data Studio

Google Data Studio helps make reporting easier. It's a great tool for SEOs working in- house or in an agency that need to create reports for clients, managers, and bosses.

25. Title Generator

Generate search-optimized titles.

26. Meta Description Generator

Generate SEO-friendly meta descriptions.

27. Google Business Profile Manager

Manage how your local business appears on Google Search and Maps.

28. Wayback Machine

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).

29. Google Alerts

Google Alerts will send you an email when pages mention terms you're tracking. This is useful for monitoring brand and competitor mentions.

30. Copyscape

Copyscape makes checking for plagiarism easy: Enter your URL and see if the content has been copied from or used elsewhere.