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Free On-Page SEO Checker

Paste your page's HTML source code below and instantly check for common on-page SEO issues — title tag, meta description, headings, image alt text, and more.

What This Tool Checks

This free on-page SEO checker audits nine fundamentals that affect how Google understands and displays your page: title tag length, meta description length, H1 heading structure, image alt text coverage, mobile viewport configuration, canonical tag presence, Open Graph tags, structured data, and content length — plus a live preview of how your page will actually look in Google search results.

You'll also see a live preview of exactly how your page will look in Google's search results — the blue title link, green URL, and gray description snippet — so you can judge the actual impact, not just a character count.

Unlike paid audit suites, it runs entirely in your browser — no signup, no account, no data leaving your device. Paste your HTML, get a score in seconds.

The 9 On-Page Ranking Factors

1. Title Tag
30-60 characters, unique and descriptive
2. Meta Description
70-160 characters, compelling summary
3. H1 Heading
Exactly one per page, describes content
4. Image Alt Text
Every image described for SEO & accessibility
5. Mobile Viewport
Correct rendering on mobile devices
6. Canonical Tag
Prevents duplicate-content confusion
7. Open Graph Tags
Clean previews when shared on social media
8. Structured Data
Schema.org markup for rich results
9. Content Length
Flags thin, hard-to-rank pages

How It Works

1
Right-click your webpage, select "View Page Source," then select all and copy the HTML.
2
Paste it into the box above and click "Check My Page."
3
Get an instant score with specific issues explained in plain language — nothing leaves your browser.

Frequently Asked Questions

What is an on-page SEO checker?

An on-page SEO checker is a tool that analyzes the elements directly on a webpage — title tags, meta description, headings, image alt text, and technical tags — that influence how search engines understand and rank that page.

Is this SEO checker really free?

Yes. The tool runs entirely in your browser with no signup, no email required, and no limit on how many pages you can check.

What on-page ranking factors does this tool check?

It checks title tag length, meta description length, H1 heading structure, image alt text coverage, mobile viewport configuration, canonical tag presence, and Open Graph tags — seven of the most fundamental on-page SEO factors.

How is this different from paid SEO audit tools like Semrush or Ahrefs?

Paid tools like Semrush and Ahrefs check hundreds of ranking factors across an entire site, including backlinks and keyword tracking, usually for a monthly fee. This free checker focuses specifically on nine core on-page fundamentals for a single page — plus a live Google search preview — with instant results and no account required.

What's a good on-page SEO score?

A score of 80% or higher generally means the core on-page fundamentals are in place. Below 50% usually indicates missing essentials like a title tag, meta description, or H1 heading that should be fixed first.

Add This Checker To Your Own Site

Run a blog, agency, or community site? Embed this tool directly for your visitors — free, no attribution required beyond the link back.

Real Audits I've Run

A furniture retailer's site had a "Bernhardt" brand link that actually loaded a completely different brand's products — a broken link nobody had caught.
The largest laundry chain in its country had a homepage "stats" section frozen at literally "00 Branches" — despite operating 30+ real locations.
A 100+ year old law firm's website displayed the placeholder contact "info@yourdomain.com" at the very top of every page — the site's real contact info was buried in the footer.

Related Tools & Reading

Built by Ehsan Ashraf, an independent SEO and digital marketing specialist with 7+ years of experience running technical SEO audits for clients worldwide.

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