Free Website SEO Analyzer — Instant On-Page Audit
Enter any URL to get an instant on-page SEO audit. Checks title tags, meta description, heading structure, image alt text, canonical, Open Graph tags, and more. Free, no signup.
Enter any public URL. Analysis runs in real-time — no login needed.
On-Page SEO: What Actually Moves the Needle
On-page SEO refers to everything you can control directly on a webpage to help search engines understand and rank it. Unlike off-page signals like backlinks — which depend on other sites — on-page factors are entirely within your control. Getting these right is the baseline requirement before any other SEO strategy makes sense. A technically broken page will underperform regardless of how many backlinks it earns.
Title Tags: The Single Most Important On-Page Signal
Your title tag appears as the blue clickable headline in Google search results. It should be 50–60 characters long (Google truncates longer titles), contain your primary keyword near the front, and accurately describe the page content. Each page on your site needs a unique title. Generic titles like “Home” or “Page 1” are wasted opportunities. A good formula: Primary Keyword — Secondary Keyword | Brand Name.
Meta Descriptions: Click-Through Rate Optimization
Meta descriptions don't directly influence rankings, but they appear as the snippet below the title in search results and heavily influence whether someone clicks your link. Keep them 150–160 characters, write them as a mini advertisement for the page, include the primary keyword naturally, and end with a subtle call to action. Missing meta descriptions let Google choose arbitrary text from your page — which is often suboptimal.
Heading Structure: H1 Through H6
- One H1 per page: The H1 is your page's main topic. Having multiple H1s confuses search engines about what the page is primarily about.
- H2s as section headers: Use H2s for major sections. Include secondary keywords naturally — don't keyword-stuff.
- Don't skip levels: Going from H1 directly to H3 (skipping H2) breaks semantic document structure and is flagged as an accessibility issue too.
Image Optimization: Alt Text and File Names
Every image needs an alt attribute that describes the image content. Search engines use alt text to understand images since they can't see them visually. Alt text also serves accessibility purposes for screen reader users. Descriptive alt text (not stuffed with keywords) helps your images appear in Google Image Search and contributes to the page's overall topic relevance. Decorative images can use empty alt="" to signal they can be ignored by screen readers.
Frequently Asked Questions
What does this SEO analyzer check?
This tool audits the most critical on-page SEO elements: title tag (length, presence), meta description (length, presence), H1 count and content, H2 structure, images with and without alt text, canonical tag, robots meta directive, Open Graph tags (og:title, og:description, og:image), lang attribute, and viewport meta tag. Each check is scored and color-coded so you can quickly identify issues.
How is the SEO score calculated?
The score is calculated by checking each SEO element against best-practice thresholds. Title between 50–60 characters scores full points; too short or too long loses points. Meta description between 150–160 characters is ideal. Exactly one H1 tag, all images with alt text, a self-referencing canonical, OG tags present, and a lang attribute each contribute to the final score out of 100.
Why can't you fetch some URLs?
Some websites block server-side requests using firewall rules, Cloudflare protection, or bot detection. If a URL cannot be fetched, the tool will display an error. Try checking the URL in a browser first to confirm it's publicly accessible. Pages behind login walls, staging environments with IP restrictions, or sites with strict User-Agent filters may not be checkable.
What is a canonical tag and why does it matter?
A canonical tag (<link rel='canonical'>) tells search engines which URL is the 'official' version of a page. This prevents duplicate content issues when the same content is accessible via multiple URLs (e.g. with/without trailing slash, with/without query parameters). A missing canonical tag can lead to ranking dilution if search engines index multiple versions of the same page.
Does a perfect SEO score guarantee first page rankings?
No. On-page SEO is one of many ranking factors. This tool checks technical on-page signals — which are necessary but not sufficient for high rankings. Off-page factors (backlinks, domain authority), page speed, Core Web Vitals, content quality, topical relevance, and search intent alignment all matter significantly. A perfect on-page score removes technical barriers, but great rankings also require quality content and authority.