10 Free Chrome Extensions You Need for SEO

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On this page

Browser extensions do one job well: they show you what a page contains while you are looking at it. These ten are free to install from the Chrome Web Store, and their core features work without a paid plan. Where a feature needs an account or a subscription, the item says so. The details for each come from its Chrome Web Store listing as of September 28, 2026, including when it was last updated, how many users it has and, where the listing names one, the developer. Extensions change owners, prices and features, so check the listing before you rely on one.

One rule applies to all of them. An extension sees the page your browser loaded, with your cookies, your location and your browser’s JavaScript engine. It does not see what Google fetched. When the question is how Google sees a page, the answer is in Search Console’s URL Inspection tool, not in a toolbar.

On-page checks

1. Detailed SEO Extension

Detailed SEO Extension shows a page’s title tag, meta description, meta robots tag and more in one click, without opening the source. Its listing names AHREFS PTE. LTD. as the developer. Last updated June 2, 2026; 600,000 users.

2. META SEO inspector

META SEO inspector shows titles and descriptions with their lengths, canonicals, meta robots, the heading hierarchy, image alt data, Open Graph and Twitter tags, and full JSON-LD. It has a dockable side panel and a newly added broken link checker. The listing describes it as completely free, with no account registration. Last updated September 23, 2026; 200,000 users.

3. SEOquake

SEOquake is published by Semrush Inc. It offers:

  • a page-level audit that checks robots directives, hreflang, XML sitemap availability, image alt text and structured data;
  • a keyword density report;
  • link analysis with HTTP status codes;
  • a SERP overlay under Google results.

The listing says the core reports work without an account. A free Semrush account adds more metrics. Last updated September 28, 2026; 1,000,000 users.

4. MozBar

MozBar is an on-page and link toolbar with three access levels, according to its listing:

  • Guest: on-page elements, general attributes and internal link details, free.
  • Free Community account: adds Moz’s Domain Authority and Page Authority.
  • Moz Pro subscribers: Spam Score, Page Optimization and keyword queries.

Published by Moz. Last updated September 20, 2026; 900,000 users.

Redirects, rendering and page behavior

5. Redirect Path

Redirect Path flags 301, 302, 404 and 500 status codes as you browse, along with client-side redirects made with meta refresh or JavaScript. It also shows other HTTP headers, such as server and caching headers, and the server IP address. The listing says processing happens on your computer. Published by Ayima UK Ltd. Last updated May 14, 2026; 300,000 users.

6. View Rendered Source

View Rendered Source shows three views of a page:

  • the raw source the server sent;
  • the rendered DOM after JavaScript ran;
  • a line-by-line difference between them.

It also has a mobile user-agent option. It shows what a JavaScript framework adds or changes. Published by Peg Leg Ltd. Last updated June 6, 2023, the oldest update on this list; 30,000 users.

7. Web Developer

Web Developer adds a toolbar of web developer tools. Its help page mentions features such as Disable JavaScript. Turning JavaScript off and reloading shows what a page offers without scripts, a useful first check before deeper rendering tests. Last updated June 29, 2024; 1,000,000 users.

8. Lighthouse

Lighthouse is Google’s open-source audit tool. It runs a set of tests against a page and reports on performance, quality and correctness, with the failing tests as a to-do list. Published by Google Ireland, Ltd. Last updated June 25, 2026; 1,000,000 users.

Check My Links scans every link on the page and highlights valid, broken and redirected ones. You can exclude sections such as the header and footer and download a report. The listing says it may show product tips after a few days, which a separate key can hide. Its listing now names SelectorsHub Tech Private Limited as the developer. Last updated September 25, 2026; 90,000 users.

10. Wappalyzer

Wappalyzer shows what a website is built with: the CMS, frameworks, ecommerce platform, JavaScript libraries, analytics and marketing tools. It is useful when you audit a site you don’t run, or check what a competitor’s template depends on. Published by Wappalyzer Pty Ltd. Last updated August 26, 2026; 3,000,000 users.

What’s no longer on lists like this

Two tools that appear on older lists have changed:

  • Web Vitals. Google has ended support for its Web Vitals extension. Its GitHub repository was archived by the owner on February 3, 2025, and the project describes the extension as end of life, with its best features brought into the Performance panel in Chrome DevTools.
  • SEO Minion. Its current listing says it is available only to customers of Keywords Everywhere’s Silver or higher plan. It is no longer a free tool.

Read authority scores for what they are

Several of these extensions show a single number for a domain: Moz’s Domain Authority and Page Authority, and Semrush’s Authority Score. Each is a vendor’s own estimate. None is a Google metric. Use them to compare sites within the same tool, and don’t compare a Moz number with a Semrush number, because the two are measured differently.

Extension or source of truth

Use an extension for speed, and go to the authoritative source when the answer matters:

Question Quick check Where the answer lives
Is the page indexable, and which canonical did Google choose? Detailed SEO, META SEO inspector URL Inspection in Search Console
Does Google see the content JavaScript adds? View Rendered Source, Web Developer URL Inspection live test, View tested page
Which redirect does a URL return? Redirect Path The server response itself, tested from outside your browser
How fast is the page for real users? Lighthouse (a lab test on your machine) Field data, such as the Core Web Vitals report in Search Console

Keep the toolbar lean

Every extension asks for permissions, and certain ones can read and change data on the sites you visit. The Web Developer help page, for example, notes that features such as Disable JavaScript need extra permissions. Before installing, read the permissions each one requests. Remove extensions you no longer use, because each one stays installed in the browser you do client work in.

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