The Marsen toolbox / SEO
Free SEO Audit
Find common page setup problems that can make your website harder to discover in search.
Start with your input
Run the SEO Audit
Inspect one public page for crawl declarations, metadata, headings, canonicals, images and JSON-LD.
What this tool checks
See what the result is based on.
This is a single-page technical check, not a whole-site crawl, rank tracker or rich-results certification.
Robots directives
Inspect crawl and indexing declarations, then confirm any restriction is intentional.
Title and description
Review the title and description for the requested page.
Canonical URL
Check the declared preferred URL; verify it represents the intended page.
Heading hierarchy
Inspect headings for a readable document structure.
Missing image alt attributes
Find images without alt attributes; decorative images can use empty alt text.
JSON-LD syntax and IDs
Check JSON syntax and entity IDs without claiming rich-result eligibility.
Methodology
How to use your result.
A trustworthy tool should show what it used, what it could not verify, and how each recommendation connects to the outcome.
- 01
Validate the input
Confirm the domain or values are usable before starting analysis.
- 02
Review what was found
Use only accessible sources and approved connections relevant to the check.
- 03
Check the details
Distinguish confirmed signals, likely explanations, and items requiring manual review.
- 04
Choose what to fix first
Order findings by impact, confidence, effort, risk, and ownership.
- 05
Measure the change
Check whether the change made the page or process better.
Use the result responsibly
What to keep in mind.
A tool can flag details worth checking. Use your knowledge of the business to decide which changes make sense.
Useful for
- Finding a structured starting point
- Surfacing evidence to verify
- Prioritizing a focused review
- Creating a shared action list
Still requires judgement
- Commercial and strategic decisions
- Legal, privacy, and provider constraints
- Implementation feasibility
- Whether a recommendation fits the business
Need to check something else?
Related free tools.
These tools can help you look at another part of the same problem.
Is the SEO Audit live and free?
Yes. The runner is live and does not require an account or a sales call.
How does the SEO Audit work?
Inspect one public page for crawl declarations, metadata, headings, canonicals, images and JSON-LD.
What are its limits?
This is a single-page technical check, not a whole-site crawl, rank tracker or rich-results certification.
Are results saved?
Reports are not saved in a database. Public website checks send the supplied URL to Marsen’s server; hosting providers may retain operational logs. Answer samples, schema input and ROI values stay in the browser.
Does a passed check guarantee rankings or conversions?
No. It confirms an observed condition in this specific input. Review the evidence, context and limitations before making changes.
What if the website cannot be fetched?
The tool shows an error for blocked, private, oversized, unsupported or timed-out responses. It does not fill in a score when evidence is unavailable.
Can Marsen help with the next step?
Yes. Use the result to scope a focused implementation around your customer, work or search workflow.
You have a result. Now what?
Let’s turn it into a useful improvement.
Help me with the next stepBring us your result. We’ll help you decide what to fix first and make the changes.