Fast Site Check — Browser Extension
Run a complete SEO audit on any webpage with one click — right from your browser toolbar.
Instant SEO Audits From Your Browser
The Fast Site Check browser extension puts professional-grade SEO auditing at your fingertips. No need to copy-paste URLs — just click the extension icon while browsing any website and get a full SEO health report instantly.
Whether you're reviewing a competitor's site, checking your own pages after a redesign, or doing a quick SEO sanity check before publishing, this extension saves you time and keeps SEO top-of-mind.
Why Use the Extension Instead of Opening the Website First?
The web version is best when you want to paste a sitemap, compare many URLs, or export a larger report. The browser extension is for the moment when you are already looking at a page and want to know whether it is safe to publish, refresh, or send to a client.
That smaller workflow matters. A lot of SEO mistakes happen during ordinary page edits: someone changes an H1, removes a meta description, publishes a page without image alt text, or forgets to check whether a redirect still works. The extension shortens that feedback loop. You can audit the active tab before the page becomes another problem in Search Console.
It is especially useful for content editors, developers, freelancers, agency reviewers, and site owners who do not want to copy URLs between tabs all day. Open the page, click the extension, read the result, fix the page, and check it again.
What the Extension Does
One-Click Audit
Click the toolbar icon on any page and instantly run a comprehensive SEO audit — no URLs to type.
Meta Tag Analysis
Check title tags, meta descriptions, Open Graph tags, and Twitter cards in seconds.
SEO Score
Every page gets a 0–100 SEO score based on industry best practices, with actionable recommendations.
Broken Link Detection
Find broken internal and external links that hurt user experience and search rankings.
Page Speed Check
Identify performance issues that slow down your site and hurt Core Web Vitals.
Right-Click Audit
Right-click on any page and select "Audit this page with Fast Site Check" from the context menu.
Best Times to Run a One-Click Page Audit
Before Publishing
Run a quick check before a new blog post, service page, landing page, or product page goes live. This catches missing titles, weak descriptions, empty alt text, and obvious crawl problems while the page is still easy to fix.
After Design Changes
Template edits can accidentally change headings, hide content, remove metadata, or introduce layout issues. Use the extension after a redesign or component update to confirm the visible page still has the signals search engines need.
During Competitor Reviews
When you are studying a competing page, the extension helps you inspect structure quickly: title, description, heading hierarchy, links, image usage, and page health. It keeps competitive research practical instead of messy.
What to Do With the Extension Report
Start with issues that can block crawling or indexing: non-200 status codes, broken canonicals, noindex tags, missing viewport tags, and redirect problems. These are the highest-risk items because they can stop a good page from being understood at all.
Next, fix the search result signals. A clear title tag and useful meta description help Google understand the page and help searchers decide whether to click. If the page already gets impressions but poor clicks, this is often the fastest improvement.
Finally, clean up quality signals: missing image alt text, weak heading structure, broken links, oversized pages, and slow responses. These fixes may look small one by one, but across a full site they create a cleaner crawl path and a better visitor experience.
Privacy and Data Handling
The extension is designed for quick checks of public pages. It does not need your CMS login, Search Console account, analytics account, or private site credentials. When you click to audit a page, it uses the current tab URL so Fast Site Check can review the public HTML and page signals.
That means it is not a replacement for private QA tools or server logs. It is a lightweight page-level SEO check for content that a normal visitor or search crawler can already request. For full-site reviews, use the main free SEO checker with sitemap crawling and export the results as CSV or JSON.
How to Install
Download
Download the extension ZIP file using the button below.
Extract
Unzip the downloaded file to a folder on your computer.
Load Extension
Open chrome://extensions, enable "Developer mode", and click "Load unpacked". Select the extracted folder.
Download Fast Site Check Extension
Free. No sign-up required. Works on Chrome, Edge, Brave, and all Chromium-based browsers.
⬇ Download Extension (ZIP)Frequently Asked Questions
Yes, the Fast Site Check extension is completely free. No ads, no premium features hidden behind a paywall.
Currently the extension is designed for Chromium-based browsers including Google Chrome, Microsoft Edge, Brave, and Opera. Firefox and Safari support is planned for a future release.
No. The extension only reads the URL of the current tab when you click the audit button. No browsing data, history, or personal information is collected or transmitted.
We are working on publishing the extension to the Chrome Web Store. In the meantime, you can install it manually using the steps above.