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g123.jp

無料ゲームがダウンロードなしで今すぐできる - G123

Last scanned Aug 1, 2026, 8:00 AM · 8 views

86

Overall score

Great

Summary

G123は無料ゲームが会員登録不要・ダウンロードなしで気軽に今すぐできるゲームサービスです。有名アニメ原作の本格ブラウザゲームを多数配信中！. This website uses Next.js behind CloudFront CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores good (85/100) and performance excellent (90/100). Top issue: Title longer than 60 characters.

G123は無料ゲームが会員登録不要・ダウンロードなしで気軽に今すぐできるゲームサービスです。有名アニメ原作の本格ブラウザゲームを多数配信中！

Top issues to fix

8 issues found

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • Title longer than 60 characters

    SEO

    Shorten the title to under 60 characters so search results don't truncate it.

  • Meta description longer than 160 characters

    SEO

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

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

75

SEO

5 issue(s) found

90

Performance

738 ms

85

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

0 overall since Jul 25, 2026

Overall
86
SEO
75
Security
85
Performance
90
Accessibility
100

Organization

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

G123は無料ゲームが会員登録不要・ダウンロードなしで気軽に今すぐできるゲームサービスです。有名アニメ原作の本格ブラウザゲームを多数配信中！

Contact

Email, phone, and address published on this site's own pages.

Meta tags

Title
無料ゲームがダウンロードなしで今すぐできる - G123
Description
G123は無料ゲームが会員登録不要・ダウンロードなしで気軽に今すぐできるゲームサービスです。有名アニメ原作の本格ブラウザゲームを多数配信中！
Canonical
https://g123.jp/?lang=ja
Language
ja
Charset
utf-8
Viewport
width=device-width, initial-scale=1, viewport-fit=cover
Robots meta
max-image-preview:large
Manifest
https://g123.jp/next-api/app.webmanifest?lang=ja

OpenGraph & Twitter Card

OpenGraph

og:title
無料ゲームがダウンロードなしで今すぐできる - G123
og:description
G123は無料ゲームが会員登録不要・ダウンロードなしで気軽に今すぐできるゲームサービスです。有名アニメ原作の本格ブラウザゲームを多数配信中！
og:type
website
og:url
https://g123.jp

Twitter Card

twitter:card
summary_large_image
twitter:title
無料ゲームがダウンロードなしで今すぐできる - G123
twitter:description
G123は無料ゲームが会員登録不要・ダウンロードなしで気軽に今すぐできるゲームサービスです。有名アニメ原作の本格ブラウザゲームを多数配信中！

Technologies

Detected frameworks, languages, and tools.

Next.jsGoogle Analytics

Hosting & CDN

Hosting provider
—
CDN provider
CloudFront
IP address
—
ASN
—

DNS records

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

TLS / SSL certificate

Version
TLS 1.3
Issuer
Amazon
Subject
g123.jp
Valid from
Jul 19, 2026
Valid to
Feb 1, 2027
Days until expiry
184
SAN domains
g123.jp, *.g123.jp

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyEnabled
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 2 · H2 15 · H3 68

Links

65 internal · 21 external · 20 broken

Images

30 total · 0 missing alt

Scripts / Styles

131 scripts · 5 stylesheets

JS / CSS size

260 KB · 0 B

Page size

475 KB

Robots.txt & Sitemap

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

SEO issues

  • Title longer than 60 characters
  • Meta description longer than 160 characters
  • Multiple H1 headings found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://g123.jp
Final URL
https://g123.jp/?lang=ja
HTTP status
200
HTTP version
HTTP/2
Response time
729 ms
HTML size
475 KB
Redirect chain
https://g123.jp → https://g123.jp/?lang=ja

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does g123.jp use?
g123.jp is built with Next.js, Google Analytics.
Is g123.jp secure (HTTPS)?
Yes. g123.jp uses TLS 1.3 with a certificate issued by Amazon, valid until Feb 1, 2027.
Who hosts g123.jp?
Hosting provider information for g123.jp is not available yet.
What is g123.jp's SEO score?
g123.jp scored 75/100 for SEO in the latest analysis (fair).
What is g123.jp's overall website score?
g123.jp has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
Has g123.jp's score changed over time?
g123.jp's overall score has stayed steady at 86/100 since Jul 25, 2026.