Page SEO checker (on-page)
Open the page in your browser, press Ctrl+U (view source), copy everything and paste it here.
How to useWhat your page is missing in SEO
Heading structure
Available in: 
Page SEO checker (on-page): what it is for
Paste a page's source code (Ctrl+U) and see in seconds what your on-page SEO is missing, with a score from 0 to 100 and what to fix in each item.
The analysis checks the length of the title and meta description, whether there is a single H1 and whether headings H1 to H6 follow the order, images without alt or without width and height, lang, viewport, canonical, a forgotten noindex, Open Graph for the preview image when sharing links, structured data (with a warning for invalid JSON), links without text and the amount of text. The heading structure is shown as a tree. It even works with pages that are not published yet.
How to use
- Copy the page's source code.
- Paste it into the tool.
- Fix the errors and warnings in order.
When to use it
- Reviewing a page before publishing.
- Auditing a client's site.
- Learning the basics of on-page SEO.
Frequently asked questions
Why paste the code instead of the address?
Reading another site directly from the browser is blocked for security reasons (CORS).
What is the ideal length for the title and description?
Google cuts them by width, not by number of letters, but in general titles up to about 60 characters and descriptions up to about 155 show in full. More important than length is saying right at the start what the page offers.
Should a page have only one H1?
It is not a Google rule, but it is good practice: one H1 saying what the page is about, and subheadings in H2, H3 in order, without skipping levels. This helps screen readers and makes the structure clear to search engines.