Basic Website SEO Audit & Inspector
Audit on-page SEO essentials: inspect metadata, heading hierarchy, image alt text, internal/external links, and document structure without server tracking.
1. Supply HTML Source
How to obtain page source HTML:
- Open any web page in Chrome, Firefox, Safari, or Edge.
- Right-click anywhere and choose "View Page Source" (or press Ctrl + U / Cmd + Option + U).
- Select all (Ctrl + A) and copy (Ctrl + C).
- Paste it here, or save it as an
.htmlfile and upload it.
100% Private: Because analysis runs client-side in your browser, your code is never stored, sent to third parties, or logged.
Ready for On-Page SEO Audit
Paste HTML source on the left, upload an .html file, or click "Load Sample HTML" to run an instant demonstration.
Understanding On-Page Technical SEO Essentials
An on-page technical SEO audit verifies that individual web pages provide clear semantic signals, accessible navigation, and crawler-friendly directives. Search engines reward pages that are transparent, well-structured, and easy for both humans and bots to consume.
Metadata & Canonicalization
Title tags, descriptions, and canonical URLs define how your page appears in search snippets and prevent duplicate content penalties across different protocols or URL parameters.
Heading Hierarchy
Headings (H1–H6) create a structured table of contents. Sequential headings improve accessibility for screen readers and clarify topic sub-sections for search bots.
Image Alt Attributes
Alt text provides textual context for search engine image indexes and assistive technologies. Decorative images should explicitly specify alt="".
Link Anchor Text
Anchor text gives search bots descriptive context about destination pages. Generic or empty links reduce crawl effectiveness and hinder accessible user navigation.
Frequently Asked Questions
Why do I need to paste or upload HTML instead of just entering a URL?
Web browsers enforce Cross-Origin Resource Sharing (CORS) security restrictions, preventing client-side code from silently reading source code from external domains. Running analysis 100% in your browser guarantees total privacy, zero server logging, and eliminates the need for expensive proxy servers.
What does the checklist score mean and is it used by Google?
The checklist score is a tool-specific adherence metric calculated from our weighted technical SEO criteria. Google and other search engines do not use automated third-party checklist scores to rank pages.
Why is a missing alt attribute different from an empty alt="" attribute?
Under W3C and accessibility standards, an image missing an alt attribute completely is an accessibility defect (screen readers read the raw URL). An empty alt="" attribute explicitly signals that the image is purely decorative and should be skipped by screen readers. Both are distinct, valid states.
Does having multiple H1 headings cause a Google ranking penalty?
No. Google Search Central advocates have confirmed that HTML5 allows multiple H1 elements and Google does not penalize pages for having more than one H1. However, using a single clear H1 remains standard best practice for screen readers and clean content outlines.
What is a skipped heading level and why does it matter?
A skipped heading level occurs when heading tags jump out of order (such as H1 followed directly by H3, skipping H2). While not an algorithmic penalty, keeping headings in sequential order improves navigation for visually impaired users using screen readers.
What is the maximum HTML file size supported?
This tool supports HTML files up to 2.5 MB, which is more than sufficient for virtually any standard web page markup.