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SGSiteGraph

shogakukan.co.jp

小学館

Last scanned Jul 30, 2026, 2:00 PM · 10 views

81

Overall score

Great

Summary

小学館公式サイト総合トップページ。小学館の会社情報、新刊案内、小学館が運営しているウェブコンテンツ、サービス、その他事業の詳しい内容、採用情報など�… This website uses Nginx. SEO is fair (60/100) and accessibility is excellent (90/100). Security scores good (80/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.

小学館公式サイト総合トップページ。小学館の会社情報、新刊案内、小学館が運営しているウェブコンテンツ、サービス、その他事業の詳しい内容、採用情報などを掲載。コミック・雑誌・書籍の検索もできます。

Top issues to fix

8 issues found · 3 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • No H1 heading found

    SEO

    Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.

  • Meta description longer than 160 characters

    SEO

    Trim the meta description to under 160 characters to avoid truncation in search results.

  • Missing canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+2 more issues — details in the sections below.

60

SEO

6 issue(s) found

100

Performance

431 ms

80

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Score history

-3 overall since Jul 22, 2026

Overall
81
SEO
60
Security
80
Performance
100
Accessibility
90

Organization

Company details published in this site's own structured data.

小学館公式サイト総合トップページ。小学館の会社情報、新刊案内、小学館が運営しているウェブコンテンツ、サービス、その他事業の詳しい内容、採用情報などを掲載。コミック・雑誌・書籍の検索もできます。

Meta tags

Title
小学館
Description
小学館公式サイト総合トップページ。小学館の会社情報、新刊案内、小学館が運営しているウェブコンテンツ、サービス、その他事業の詳しい内容、採用情報などを掲載。コミック・雑誌・書籍の検索もできます。
Canonical
Language
ja
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest
https://www.shogakukan.co.jp/manifest.json

OpenGraph & Twitter Card

OpenGraph

og:title
小学館
og:description
小学館公式サイト総合トップページ。小学館の会社情報、新刊案内、小学館が運営しているウェブコンテンツ、サービス、その他事業の詳しい内容、採用情報などを掲載。コミック・雑誌・書籍の検索もできます。
og:type
—
og:url
http://www.shogakukan.co.jp

Twitter Card

twitter:card
summary_large_image
twitter:title
小学館
twitter:description
小学館公式サイト総合トップページ。小学館の会社情報、新刊案内、小学館が運営しているウェブコンテンツ、サービス、その他事業の詳しい内容、採用情報などを掲載。コミック・雑誌・書籍の検索もできます。

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

Hosting provider
—
CDN provider
—
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Japan Registry Services Co., Ltd.
Subject
*.shogakukan.co.jp
Valid from
Sep 4, 2025
Valid to
Sep 30, 2026
Days until expiry
62
SAN domains
*.shogakukan.co.jp, shogakukan.co.jp

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

0 internal · 0 external · 0 broken

Images

0 total · 0 missing alt

Scripts / Styles

6 scripts · 3 stylesheets

JS / CSS size

47.3 KB · 0 B

Page size

104 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Meta description longer than 160 characters
  • Missing canonical link
  • No H1 heading found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://shogakukan.co.jp
Final URL
https://www.shogakukan.co.jp/
HTTP status
200
HTTP version
HTTP/1.1
Response time
429 ms
HTML size
104 KB
Redirect chain
https://shogakukan.co.jp → https://www.shogakukan.co.jp/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does shogakukan.co.jp use?
shogakukan.co.jp is built with Nginx.
Is shogakukan.co.jp secure (HTTPS)?
Yes. shogakukan.co.jp uses TLS 1.3 with a certificate issued by Japan Registry Services Co., Ltd., valid until Sep 30, 2026.
Who hosts shogakukan.co.jp?
Hosting provider information for shogakukan.co.jp is not available yet.
What is shogakukan.co.jp's SEO score?
shogakukan.co.jp scored 60/100 for SEO in the latest analysis (fair).
What is shogakukan.co.jp's overall website score?
shogakukan.co.jp has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.
Has shogakukan.co.jp's score changed over time?
shogakukan.co.jp's overall score has declined by 3 points (from 84 to 81) since Jul 22, 2026.