An SEO toolbar is a browser extension that surfaces SEO data (on-page tags, redirects, backlinks, authority scores) without leaving the page or search result you're already on. There are four serious options in 2026, and they're not interchangeable. This guide covers what each does, which features need a paid account, and which to install for your use case.
4 toolbars comparedChrome, Firefox, Safari, EdgeFree & paid features
Quick answer
Install the Ahrefs SEO Toolbar first. It has the most useful free features of any SEO toolbar in 2026. On-page audit, redirect tracer, broken link checker, link highlighter, HTTP headers reader, user-agent switcher, all without an account.
Add SEOquake alongside it if you specifically want metric overlays on every Google search result without paying for anything. Skip MozBar in 2026, most of its features now need a Moz Pro subscription, and the extension is barely updated. Semrush SEO Toolbar is for existing Semrush subscribers only.
An SEO toolbar is a browser extension built specifically for the inspection work SEOs do dozens of times a day, checking title and description tags, looking at redirect chains, spotting nofollow and sponsored links, reading hreflang annotations, and pulling backlink or authority metrics for a domain without opening a separate SEO platform. It sits in your browser's extension area as a small icon. Click it on any webpage and a panel opens with a structured report; on Google search results, the metrics appear inline under each listing.
The major SEO toolbars share most of their core features, on-page audit, link inspection, redirect tracing. But each has its own specialty. Ahrefs Toolbar is the most polished for free inspection. SEOquake is the only free option for SERP overlays without signing in. MozBar pioneered the format in 2010 but in 2026 has fallen behind. Semrush's toolbar exists primarily to extend an existing Semrush subscription into the browser.
Not the same as Google Toolbar. Google never published an official SEO toolbar. The legacy "Google Toolbar" for Internet Explorer (discontinued 2021) included a public PageRank indicator until Google killed PageRank export in 2016. Modern SEO toolbars are all third-party.
Which SEO toolbar should you install
The right toolbar depends on what you do most often. Here are the four serious options ranked by how useful their free feature set is in 2026:
Ahrefs SEO ToolbarFreemium
Best overall · free features
On-page audit, redirect tracer, broken link checker, link highlighter, headers reader, UA switcher, Google country/language changer, all free, no account. DR/UR/backlink metrics need a paid Ahrefs plan.
Made by Semrush, but completely free with no account required. Shows Authority Score, backlinks, traffic, and rank for every result on every Google SERP. Also has on-page audit and CSV export.
Not a full SEO toolbar, single-purpose extension that injects search volume, CPC, and related keywords directly into Google search results. Free, no account. Use alongside Ahrefs or SEOquake.
Pulls Authority Score, backlinks, traffic estimates, and keyword data from a Semrush subscription. Free tier shows almost nothing. This toolbar only makes sense as a companion to an existing Semrush plan ($139/mo+).
Pioneer of the SEO toolbar category but barely updated in 2026. Free version shows highlights on links; DA, PA, and Spam Score all require a paid Moz Pro account ($99/mo+). Use it only if you specifically need Moz's metrics.
The table below covers every feature people typically need from an SEO toolbar in 2026, plus what each one charges for. If you're picking just one, the column with the most green cells is the safer default.
Most coverage online assumes Chrome. In 2026 every major SEO toolbar except Keyword Surfer also runs on Firefox, all four big toolbars work on Edge natively, and Ahrefs is the only one with a real Safari version. Detailed install instructions and what to expect on each browser:
Chrome: Every toolbar in this guide. Install from the Chrome Web Store and pin via the puzzle icon. See all SEO extensions for Chrome.
Firefox: Ahrefs, SEOquake, MozBar, and Semrush (beta), full feature parity with the Chrome versions. Detailed picks in our Firefox SEO toolbar guide.
Safari: Ahrefs SEO Toolbar (via Mac App Store) is the only first-class option. Workarounds for the others in our Safari SEO extensions guide.
Edge: Chromium-based, so every Chrome Web Store SEO toolbar installs directly. See SEO extensions for Edge.
Brave, Opera, Vivaldi: All three are Chromium and install Chrome extensions natively. Brave Shields can block parts of the toolbar. Whitelist the toolbar's domain in shields if the side panel shows no data.
Internet Explorer: Retired in 2022. No modern SEO toolbar supports it. Use Edge instead, same Microsoft account, same favourites.
How to install an SEO toolbar
The install flow is roughly the same for any SEO toolbar on Chromium browsers, two clicks plus a permissions confirmation. Safari and Firefox have small variations. Generic steps for Chrome:
Open the Chrome Web Store and search for the toolbar by name (e.g. "Ahrefs SEO Toolbar"). Always install from the official store, never from .crx files or third-party sites.
Verify the publisher. The publisher name and verified-trader badge under the extension's title must match the company: Ahrefs Pte. Ltd. for Ahrefs, Semrush Inc. for SEOquake and Semrush Toolbar, Moz Inc. for MozBar.
Click Add to Chrome and confirm the permissions dialog. SEO toolbars require read-access to the pages you visit. Necessary for the on-page audit features.
Pin to your toolbar. Click the puzzle icon in Chrome's top-right area, then click the pin next to the new extension. The icon will stay in your toolbar for one-click access.
Test it. Visit any webpage and click the toolbar icon. The on-page report should appear immediately, no account needed for the free features.
Don't install more than two SEO toolbars at once. Each toolbar reads every page you visit, fires API calls, and competes for the same UI space on Google search results. Two toolbars maximum, one for on-page work (Ahrefs), one for SERP overlays (SEOquake). Any more and your browser will visibly slow down. See why Chrome extensions slow your browser.
What an SEO toolbar actually shows you
Every SEO toolbar shows roughly the same eight categories of data. What differs is depth, freshness, and which are free. If you've never used one, here's what to expect when you click the icon on any webpage:
On-page report
Title, description, canonical URL, meta robots directives, full heading hierarchy (H1 through H6), Open Graph and Twitter Card tags, hreflang annotations, schema.org structured data summary, and a "language" detection. Click any element in the report to jump to it on the page. This is the part you'll use most.
Authority metrics
Ahrefs shows Domain Rating (DR) and URL Rating (UR), SEOquake shows Authority Score, MozBar shows Domain Authority (DA) and Page Authority (PA), Semrush shows Authority Score. These are not interchangeable, they're each tool's proprietary estimate of how authoritative a domain is on a 0–100 scale, based on each tool's own crawl of the web. Most metrics need a paid account from that tool.
Link inspection
Highlight every link on the page coloured by attribute: nofollow, sponsored, UGC, internal, external. Spot dofollow opportunities on a competitor's resource page in seconds. Ahrefs and MozBar both have this; SEOquake doesn't.
Redirect chain
Click a URL and see every hop in its redirect chain, 301, 302, 307 codes shown at each step, plus the final destination. Useful during migrations, when checking competitor cloaking, or for spotting redirect loops. Ahrefs is the only major toolbar with this for free.
Broken link checker
Scans every link on the current page and flags 4xx and 5xx responses. The dual use: find broken links on your own pages for an audit, or find broken links on relevant resource pages for outreach (suggest your URL as replacement).
HTTP headers
Full response headers without opening DevTools. Cache-control, content-type, security headers (HSTS, CSP), custom headers. Diagnosing CDN, caching, or migration issues becomes much faster.
User-agent switcher
Reload the current page as Googlebot, Bingbot, mobile Safari, or any custom user agent. Catches cloaking and identifies user-agent-specific rendering issues that would otherwise need a separate extension or DevTools network conditions.
SERP overlays
On any Google search result page, inject backlink count, authority score, organic traffic, top keyword, and other data directly under each listing. Ahrefs and Semrush do this with paid accounts; SEOquake does it free with no account.
An SEO toolbar is a browser extension that displays SEO information about the page or search results you're currently viewing. Core functions across all major SEO toolbars: on-page SEO audit (title, description, headings, canonical, robots tags), backlink and authority metrics on Google search results, redirect chain tracing, and broken link checking. The most-installed SEO toolbars in 2026 are Ahrefs SEO Toolbar, SEOquake by Semrush, MozBar, and Semrush SEO Toolbar.
For free on-page audits, redirect tracing, and broken link checking, the Ahrefs SEO Toolbar is the most polished free option in 2026, every inspection feature works without an account. For free SERP overlays with authority and traffic metrics, SEOquake is the only free option that shows data on every Google result without signing in. MozBar is the oldest free SEO toolbar but most of its metrics now require a paid Moz Pro account.
Yes. Ahrefs SEO Toolbar, SEOquake, and MozBar all have official Firefox versions on the Mozilla Add-ons directory with the same feature set as their Chrome versions. Keyword Surfer is Chrome-only. For full coverage of which extensions work on which Firefox, see our Firefox SEO toolbar guide.
Google has never published an official SEO toolbar. The old "Google Toolbar" for Internet Explorer (discontinued 2021) included a PageRank indicator until 2016 but was a general browser toolbar, not an SEO tool. For modern SEO data, install a third-party toolbar, Ahrefs, SEOquake, MozBar, or Semrush. And consult Google Search Console for the official data Google provides on your own site.
Toolbars from verified publishers (Ahrefs Pte. Ltd., Semrush Inc., Moz Inc.) installed from the official Chrome Web Store or Mozilla Add-ons directory are safe. All four major SEO toolbars request read-access to webpages, necessary for the on-page audit features. Never install SEO toolbars from third-party download sites or .crx files; that's how almost all malicious clone extensions are distributed.
Ahrefs SEO Toolbar is the best overall SEO toolbar for Chrome in 2026, most useful free features, polished side panel, active monthly updates. Install SEOquake alongside it if you also need free metrics on every Google search result. Both extensions are available in the Chrome Web Store from their verified publishers.