100 Free SEO Tools to Improve Your Website

Search engine optimisation does not have to start with an expensive subscription. A wide range of free tools can help you research keywords, check technical issues, improve page speed, monitor links and understand how people find your website.

This guide brings together 100 useful SEO tools, including permanently free services, open-source software and tools with a free plan or limited free searches. Availability and free-use limits can change, so check each provider’s terms before relying on a tool for regular work.

Google tools

1. Google Search Console – See how your site performs in Google Search, check indexing and identify some technical issues.
2. Google Analytics 4 – Explore website traffic, engagement and conversions. It is free for most standard use.
3. Google Keyword Planner – Find keyword ideas and estimated search volumes through a Google Ads account. Some data is shown in ranges.
4. Google Trends – Compare interest in search terms over time, by location and across topics.
5. Google PageSpeed Insights – Check page performance on mobile and desktop, with suggestions for improvement.
6. Lighthouse – Run performance, accessibility and SEO-related checks in Chrome DevTools or through other integrations.
7. Google Rich Results Test – Test whether a page may be eligible for certain rich results in Google Search.
8. Google Tag Assistant – Check whether Google tags are installed and firing as expected.
9. Chrome DevTools – Inspect pages, network requests, mobile layouts and browser performance.
10. Google Alerts – Receive email notifications when Google finds new results for selected topics or brand names.

Bing and web standards tools

11. Bing Webmaster Tools – Monitor Bing search performance, indexing and website health.
12. Bing Keyword Research – Discover keyword ideas and historical search trends within Bing Webmaster Tools.
13. Bing Site Scan – Crawl a website for selected technical SEO issues through Bing Webmaster Tools.
14. Bing SEO Reports – Review SEO recommendations and issues detected on your site by Bing.
15. Microsoft Clarity – Use session recordings and heatmaps to understand how visitors interact with pages.
16. Bing URL Inspection – Check how Bing sees a particular URL, including its crawl and indexing status.
17. Bing Backlinks – Explore backlink information available for your site in Bing Webmaster Tools.
18. W3C Markup Validation Service – Check HTML markup for standards-related errors.
19. W3C CSS Validation Service – Find problems in your website’s CSS code.
20. Chrome UX Report (CrUX) – Explore real-world user experience data for eligible websites and pages.

Keyword research tools

21. Ahrefs Free Keyword Generator – Find keyword suggestions and see basic search metrics for selected terms.
22. Semrush Keyword Overview – View keyword metrics and related ideas with the free account’s usage limits.
23. Ubersuggest – Research keywords and review basic SEO data; free searches are limited.
24. WordStream Free Keyword Tool – Generate keyword ideas and estimated search data for selected industries and locations.
25. Keyword Tool – Find autocomplete-based suggestions from search platforms; some metrics require a paid plan.
26. Keyword Surfer – A browser extension that displays keyword estimates and related terms on Google results pages.
27. Keyword Sheeter – Generate large lists of autocomplete keyword ideas.
28. Soovle – Compare autocomplete suggestions from several search and content platforms.
29. SearchVolume.io – Check estimated search volumes for keyword lists, subject to its free-use limits.
30. SEOStack Keyword Tool – A browser extension for collecting autocomplete keyword suggestions.

Search intent and topic research tools

31. Google Search autocomplete – Use suggested searches to discover common ways people phrase a query.
32. YouTube autocomplete – Find video-related search suggestions and content ideas.
33. Amazon autocomplete – Explore product-focused phrases that shoppers search for on Amazon.
34. Bing autocomplete – Gather search suggestions directly from Bing.
35. AnswerThePublic – Find questions and related searches around a topic; free searches are limited.
36. AlsoAsked – Explore related questions and how they connect; the free plan has usage limits.
37. QuestionDB – Discover questions people ask about a topic, with limits on free use.
38. Exploding Topics – Spot emerging topics and trends; some data and features are restricted to paid plans.
39. Glimpse – Explore trend insights and search-term interest using its free options and browser extension.
40. Google related searches – Review the related queries shown on Google results pages to find adjacent topics and search needs.

On-page SEO tools and extensions

41. Yoast SEO – A WordPress plugin with free tools for titles, meta descriptions, XML sitemaps and basic on-page guidance.
42. Rank Math – A WordPress SEO plugin offering a free version with features such as schema settings and on-page checks.
43. All in One SEO (AIOSEO) – A WordPress plugin with a free version for core SEO settings and page optimisation.
44. SEOPress – A WordPress plugin whose free edition includes essential SEO settings and sitemap features.
45. Slim SEO – A lightweight WordPress plugin that automates several basic SEO tasks.
46. SEOquake – A browser extension for viewing SEO information on pages and search results.
47. Detailed SEO Extension – Quickly inspect page titles, headings, canonicals, robots directives and other on-page details.
48. Ahrefs SEO Toolbar – Check selected on-page and link information while browsing; some metrics require an Ahrefs account.
49. SEO Minion – A browser extension for tasks such as checking broken links and reviewing on-page elements.
50. Web Developer extension – A browser toolkit for inspecting page structure, images, forms and other technical details.

Website crawling and technical SEO tools

51. Screaming Frog SEO Spider – Crawl up to 500 URLs for free to find issues such as broken links, missing titles and redirect chains.
52. Xenu Link Sleuth – A free desktop crawler for finding broken links on websites.
53. Beam Us Up – A free desktop SEO crawler for reviewing site links and selected on-page issues.
54. SiteOne Crawler – An open-source crawler for exploring websites and identifying technical issues.
55. Netpeak Spider – A desktop crawler with a free version and limits on some features or usage.
56. Seobility SEO Checker – Run a limited free site audit and review selected on-page and technical issues.
57. Sitechecker Website SEO Checker – Check a page for basic SEO issues; more advanced features are paid.
58. SEO Site Checkup – Run a limited website health check and see suggestions for improvements.
59. TechnicalSEO.com Robots.txt Tester – Check how robots.txt rules affect access to URLs.
60. XML-Sitemaps.com – Generate an XML sitemap for smaller sites within the free version’s limits.

Structured data, speed and security tools

61. Schema Markup Validator – Validate structured data against Schema.org vocabulary.
62. Merkle Schema Markup Generator – Create common types of structured data, such as LocalBusiness and FAQ markup.
63. JSON-LD Playground – Test and inspect JSON-LD structured data.
64. Google Structured Data Markup Helper – Tag page content to help create structured data markup.
65. GTmetrix – Test page speed and review performance recommendations; free tests are limited.
66. WebPageTest – Run detailed website performance tests from different locations and browsers.
67. DebugBear Website Speed Test – Review page speed and performance metrics using its free testing options.
68. Yellow Lab Tools – Analyse front-end performance issues, including page weight and inefficient code.
69. Cloudflare Observatory – Review website performance and security-related information using Cloudflare’s available tools.
70. SSL Labs Server Test – Check the configuration and certificate of a website’s HTTPS server.

Backlink tools

71. Ahrefs Free Backlink Checker – View a sample of backlinks and referring domains for a website.
72. Moz Link Explorer – Check link data and key metrics with a free Moz account and limited queries.
73. Semrush Backlink Analytics – Review backlink information with limited access on the free plan.
74. Majestic Site Explorer – Inspect available backlink data; free access and metrics are limited.
75. Seobility Backlink Checker – Check a domain for backlink information using the free checker.
76. SEO Review Tools Backlink Checker – Get a limited overview of backlinks pointing to a domain or page.
77. SmallSEOTools Backlink Checker – Run a basic backlink check, subject to usage limits.
78. DupliChecker Backlink Checker – Check selected backlink information with its free online tool.
79. Prepostseo Backlink Checker – Review backlink data with a free checker and daily or query limits.
80. Search Console Links report – Review some of the links Google has found pointing to your site.

Local SEO tools

81. Google Business Profile – Manage how a business appears on Google Search and Maps.
82. Bing Places for Business – Add or manage a business listing for Bing Search and Maps.
83. Apple Business Connect – Manage business information shown across Apple services, including Maps.
84. PlePer Local SEO Tools – Access a collection of tools for researching Google Business Profiles and local listings.
85. GMB Everywhere – Use its browser extension to inspect selected Google Business Profile information; some features are limited.
86. BrightLocal Local Search Results Checker – Check local search results for selected locations, with free-use limits.
87. Whitespark Local Citation Finder – Explore citation opportunities; free access is limited.
88. Google Maps – Manually check local competitors, categories, reviews and how businesses appear in map results.
89. Local Falcon – Explore local rank tracking with limited free access or trial options, depending on current availability.
90. GeoRanker Local Rank Checker – Check local search visibility using its free or limited-use options.

Content quality and final-check tools

91. TechnicalSEO.com SERP Simulator – Preview how a title and meta description may appear in search results.
92. Mangools SERP Simulator – Preview search snippets and check whether titles or descriptions may be truncated.
93. Grammarly – Check spelling, grammar and clarity with its free writing assistant.
94. Hemingway Editor – Identify long or complicated sentences and improve readability.
95. LanguageTool – Check spelling and grammar, including UK English, with a free version.
96. Siteliner – Scan smaller websites for duplicate content, broken links and other issues within its free limits.
97. Dr. Link Check – Scan a website for broken links using its free online checker, subject to limits.
98. Check My Links – A browser extension that checks links on the page you are viewing.
99. Internet Archive Wayback Machine – View archived versions of pages to research changes to content and websites.
100. Copyscape Free Search – Check whether a page’s text appears elsewhere online; free checks are limited.

How to choose the right free SEO tools

Start with tools that answer a clear question. Google Search Console can show which queries bring visitors to your site, while a crawler can help uncover technical problems. Keyword tools are useful for building topic ideas, and speed testers can highlight pages that need performance work.

Free tools often limit the number of searches, pages, reports or saved projects. Some provide estimates rather than exact figures, so compare important findings across more than one source. Above all, use the results to guide useful improvements for visitors—not simply to chase a particular SEO score.