SEO Checker
Enter a page address to get a score, a grade and a prioritised list of fixes, each with a plain explanation of what to do.
このコンテンツは英語です。
計算例
Checking a shop page
https://example.com/shop typed into the address box
(Illustrative) Title 58 characters, description missing, one H1, canonical link present, indexing allowed, and 2 images without alt text.
The page is read as a visitor first receives it, so content added later by script is not seen.
Page asking not to be indexed
https://example.com/offer typed into the address box, with a noindex tag
(Illustrative) High priority: a noindex instruction is set, so the page is asked not to appear in search results.
A noindex tag is often left on by mistake after a site launch, so check it first.
SEO Checker について
An SEO checker reads a web page the way a search engine first meets it and tells you what is helping and what is holding it back. This one looks at the title and description, the headings, the canonical link, whether the page is allowed to be indexed, the language and mobile settings, social sharing tags, image descriptions, links, the amount of text and any structured data. It also checks the address itself: whether it uses HTTPS, whether the old http version redirects, and whether the www and non-www versions compete.
The result is an overall score out of 100 with a grade, followed by findings sorted into high, medium and low priority. Every finding shows the actual evidence found on your page, such as the title text or the tag that is missing, and a plain sentence explaining what to do next. High priority items are the ones that can stop a page appearing in search at all, like a noindex instruction or a robots.txt rule that blocks it, so you can fix those first and leave the polish for later. The checks are the same ones a careful consultant would make by hand, collected into a single page.
SEO Checker の使い方
- Enter the full address of the page you want to check.
- Select Check page and wait a few seconds while the page and its related files are read.
- Read the score and grade, then start with the high priority findings.
- Make the changes on your site, then run the check again to confirm the score has improved.
主な使いみち
- Checking a new landing page before it goes live
- Reviewing key pages after a redesign or migration
- Finding why an important page is not appearing in search results
- Giving a client a clear list of fixes in priority order
- Spot checking competitor pages to see how they are set up
よくあるご質問
What does the SEO score mean?
The score starts at 100 and loses points for each problem, with high priority problems costing the most and low priority ones very little. It is a quick way to compare pages or see progress over time, but it is not a ranking prediction. A page with a perfect score can still rank poorly if its content is weak or the topic is very competitive.
Does the checker see content added by JavaScript?
No. It reads the page as a visitor first receives it, before any script has run. Most search engines can run scripts, but important content and tags that only appear after a script runs are slower to be picked up, so it is safest to include titles, headings, descriptions and main text in the page itself.
Why does it check the http address and the www version?
If both http and https, or both the www and non-www versions of your site, load as separate copies, search engines may split ranking between them. The check follows each alternative address and tells you whether it redirects to the main version, which is the setup you want, ideally with a permanent redirect.
How long should a title and description be?
Titles of about 30 to 60 characters usually display in full in search results, and descriptions of about 120 to 160 characters are a good target. These are guides rather than hard limits, because display depends on the width of the letters used, so use the lengths as a prompt to review wording rather than a strict rule.
Can I check pages that need a login?
No. Only public pages on the standard web ports can be checked, and the checker has no way to sign in. If a page is behind a login, search engines cannot see it either, so there is nothing to audit. Check the public pages that you want people to find instead.
How often should I run an SEO check?
Run it after any change to templates, navigation, hosting or addresses, and after launching important new pages. For a stable site, a check every few months on your top pages is enough to catch problems such as an accidental noindex, a broken canonical link or a missing title after an update.