nts.go.kr SEO report

국세청

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43/ 100

OVERALL SEO SCORE

Review your next improvements

Checks are based on public HTML and responses. Review the evidence and recommended actions below.

Passed13
Needs review17
Not checked1
Analyzed Checks 31

The score excludes checks that could not be completed.

Screenshot

PagePeeker
nts.go.kr
nts.go.kr Screenshot

NEXT STEPS

Recommended next steps

Up to four findings, ordered by check weight.

Detailed findings

Review the observed values, context and actions for each check.

02

Content and images

5 checks

Headings

Passed
H1 1 / H2 14 / H3 0

Headings organize a page into a main topic and supporting sections. This tool checks for one H1 and shows the saved H2-H6 structure.

Keep in mind

Use H1 for the main subject and H2/H3 for logical subsections, rather than selecting levels for visual size alone.

Image alt

Needs review
85 images; 28 with non-empty alt; 57 empty or missing

Alternative text conveys an image’s meaning. The count includes images with non-empty alt text.

Recommended action

Describe informative images in context. Empty alt="" can be appropriate for decorative images, so inspect their purpose before changing them.

Targets and suggested changes

Targethttps://nts.go.kr/upload/nts/fs/img_b5c78a11-65e3-4656-9312-b6533311228c1617777430408.png

HTML response line 1933 · /html/body/div[3]/div[1]/section[1]/div/div[3]/div/div[1]/ul/li[1]/a/span/img

Find the img tag using this URL. Describe informative content, or explicitly use empty alt for a decorative image. The text below is a placeholder; preserve existing classes, dimensions and other attributes.

View evidence and example changes
Observed content
<img src="/upload/nts/fs/img_b5c78a11-65e3-4656-9312-b6533311228c1617777430408.png" alt="">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/upload/nts/fs/img_b5c78a11-65e3-4656-9312-b6533311228c1617777430408.png" alt="Describe the actual image content">

For a decorative image:
<img src="https://nts.go.kr/upload/nts/fs/img_b5c78a11-65e3-4656-9312-b6533311228c1617777430408.png" alt="">

Targethttps://nts.go.kr/upload/nts/fs/img_55b70f20-6e1a-469e-a1e5-62f23308107d1617777441055.png

HTML response line 1939 · /html/body/div[3]/div[1]/section[1]/div/div[3]/div/div[1]/ul/li[2]/a/span/img

Find the img tag using this URL. Describe informative content, or explicitly use empty alt for a decorative image. The text below is a placeholder; preserve existing classes, dimensions and other attributes.

View evidence and example changes
Observed content
<img src="/upload/nts/fs/img_55b70f20-6e1a-469e-a1e5-62f23308107d1617777441055.png" alt="">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/upload/nts/fs/img_55b70f20-6e1a-469e-a1e5-62f23308107d1617777441055.png" alt="Describe the actual image content">

For a decorative image:
<img src="https://nts.go.kr/upload/nts/fs/img_55b70f20-6e1a-469e-a1e5-62f23308107d1617777441055.png" alt="">

Targethttps://nts.go.kr/upload/nts/fs/img_74502a87-69bc-49ab-91e6-066e81e84b891617777451586.png

HTML response line 1945 · /html/body/div[3]/div[1]/section[1]/div/div[3]/div/div[1]/ul/li[3]/a/span/img

Find the img tag using this URL. Describe informative content, or explicitly use empty alt for a decorative image. The text below is a placeholder; preserve existing classes, dimensions and other attributes.

View evidence and example changes
Observed content
<img src="/upload/nts/fs/img_74502a87-69bc-49ab-91e6-066e81e84b891617777451586.png" alt="">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/upload/nts/fs/img_74502a87-69bc-49ab-91e6-066e81e84b891617777451586.png" alt="Describe the actual image content">

For a decorative image:
<img src="https://nts.go.kr/upload/nts/fs/img_74502a87-69bc-49ab-91e6-066e81e84b891617777451586.png" alt="">

Targethttps://nts.go.kr/upload/nts/fs/img_8d96b5c8-6b62-44c0-be5b-f8cffbd041911617777465253.png

HTML response line 1951 · /html/body/div[3]/div[1]/section[1]/div/div[3]/div/div[1]/ul/li[4]/a/span/img

Find the img tag using this URL. Describe informative content, or explicitly use empty alt for a decorative image. The text below is a placeholder; preserve existing classes, dimensions and other attributes.

View evidence and example changes
Observed content
<img src="/upload/nts/fs/img_8d96b5c8-6b62-44c0-be5b-f8cffbd041911617777465253.png" alt="">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/upload/nts/fs/img_8d96b5c8-6b62-44c0-be5b-f8cffbd041911617777465253.png" alt="Describe the actual image content">

For a decorative image:
<img src="https://nts.go.kr/upload/nts/fs/img_8d96b5c8-6b62-44c0-be5b-f8cffbd041911617777465253.png" alt="">

Targethttps://nts.go.kr/upload/nts/fs/img_2b2b4a3c-478c-4fa0-bac6-ae9223ef1b481617777492725.png

HTML response line 1957 · /html/body/div[3]/div[1]/section[1]/div/div[3]/div/div[1]/ul/li[5]/a/span/img

Find the img tag using this URL. Describe informative content, or explicitly use empty alt for a decorative image. The text below is a placeholder; preserve existing classes, dimensions and other attributes.

View evidence and example changes
Observed content
<img src="/upload/nts/fs/img_2b2b4a3c-478c-4fa0-bac6-ae9223ef1b481617777492725.png" alt="">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/upload/nts/fs/img_2b2b4a3c-478c-4fa0-bac6-ae9223ef1b481617777492725.png" alt="Describe the actual image content">

For a decorative image:
<img src="https://nts.go.kr/upload/nts/fs/img_2b2b4a3c-478c-4fa0-bac6-ae9223ef1b481617777492725.png" alt="">

57 targets; the first five are shown. Review the full saved list in the details below.

Language

Passed
ko

The html lang attribute identifies the document’s primary language and helps assistive software select pronunciation.

Keep in mind

Match lang to the main content and mark passages written in another language as appropriate.

Charset

Passed
UTF-8

The encoding declaration tells clients how to decode text. It must match the actual response bytes.

Keep in mind

Keep the HTTP or HTML charset declaration consistent with the file encoding; use UTF-8 for UTF-8 content.

Text/HTML ratio

Needs review
6.06%

Tool reference range 15-70%; not an official ranking threshold.

This compares visible text length with HTML length. It cannot determine content quality or rankings on its own.

Recommended action

Do not add filler text to target a ratio. Check for useful HTML content and unnecessary markup.

Targets and suggested changes

Targethttps://nts.go.kr/

main / body

Check whether main content exists in the initial HTML. Consider server rendering for missing core text; do not add filler to target a ratio.

View evidence and example changes
Observed content
6.06%

Heading structure

Saved headings, up to 50 per level. Expand the H2-H6 lists when needed.

H11
H214
H30
H40
H50
H60
H1

국세청

H2 14View headings
  1. 검색창
  2. 월별 세무 일정
  3. 자주찾는 서비스
  4. 납세자별 및 복지세정
  5. 세목별 정보
  6. 청년세금
  7. 알림판
  8. 전체
  9. 보도·설명 자료
  10. 공지사항
  11. 고시
  12. 공고
  13. 바로가기
H3 0View headings

No headings at this level.

Images and alternative text85 saved

Up to 100 images are saved. Review an image’s purpose when its alt text is empty.

URLImage alt
https://nts.go.kr/images/web/nts/main/eg_logo.png태극기
https://nts.go.kr/images/web/nts/layout/icon-keyboard.png키보드
https://nts.go.kr/images/web/nts/main/icon_sns06.png유투브
https://nts.go.kr/images/web/nts/main/icon_sns09.png인스타그램
https://nts.go.kr/images/web/nts/main/icon_sns02.png페이스북
https://nts.go.kr/images/web/nts/main/icon_sns01.png네이버 블로그
https://nts.go.kr/images/web/nts/main/icon_sns08.pngX
https://nts.go.kr/images/web/nts/main/icon_sns05.png카카오스토리
https://nts.go.kr/upload/nts/visual/main/img_a962e9be-1763-483b-9392-a970dafc70931792392693605.png국민이 추천하는, 국세청의 빛나는 성과 국민의 목소리로 적극적으로 일한 국세청의 성과를 알려주세요
https://nts.go.kr/upload/nts/visual/mobile/img_1c3654c0-d98f-4c65-ba83-9c87cee9b9731792392693622.png국민이 추천하는, 국세청의 빛나는 성과 국민의 목소리로 적극적으로 일한 국세청의 성과를 알려주세요
https://nts.go.kr/images/web/nts/main/img_empty_pc.png근로·자녀장려금 숏폼 영상 공모전 당신의 이야기로 더 나은 내일을 지금, 숏폼으로 참여하세요! 2026. 10.21. 수 - 11. 23. 월
https://nts.go.kr/images/web/nts/main/img_empty.png근로·자녀장려금 숏폼 영상 공모전 당신의 이야기로 더 나은 내일을 지금, 숏폼으로 참여하세요! 2026. 10.21. 수 - 11. 23. 월
https://nts.go.kr/images/web/nts/main/img_empty_pc.pngk-suul Awards 국민,외국인 심사단 모집
https://nts.go.kr/images/web/nts/main/img_empty.pngk-suul Awards 국민,외국인 심사단 모집
https://nts.go.kr/images/web/nts/main/img_empty_pc.png가상자산 과세 관련 국세청 사칭 해킹메일에 주의하세요!
https://nts.go.kr/images/web/nts/main/img_empty.png가상자산 과세 관련 국세청 사칭 해킹메일에 주의하세요!
https://nts.go.kr/images/web/nts/main/img_empty_pc.png생계형체납자의 체납액 납부의무 소멸특례 제도안내 자세히보기
https://nts.go.kr/images/web/nts/main/img_empty.png생계형체납자의 체납액 납부의무 소멸특례 제도안내 자세히보기
https://nts.go.kr/images/web/nts/main/img_empty_pc.png국세청이 알려주는 주식양도소득세 자주 실수하는 사례 국세청 자본거래관리과
https://nts.go.kr/images/web/nts/main/img_empty.png국세청이 알려주는 주식양도소득세 자주 실수하는 사례 국세청 자본거래관리과
https://nts.go.kr/upload/nts/fs/img_b5c78a11-65e3-4656-9312-b6533311228c1617777430408.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_55b70f20-6e1a-469e-a1e5-62f23308107d1617777441055.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_74502a87-69bc-49ab-91e6-066e81e84b891617777451586.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_8d96b5c8-6b62-44c0-be5b-f8cffbd041911617777465253.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_2b2b4a3c-478c-4fa0-bac6-ae9223ef1b481617777492725.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_140db3b0-c457-41d9-bbf8-55b10f79ecb91617777517759.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_fe8ece65-bb42-4ef7-be69-02f1d300c2211617777529983.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_898a0bd6-9ce6-456e-9cee-3d36aa8e26d91617777542766.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_781f806c-74a7-4635-aaae-598773f540b11617777555131.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_1db45687-5e2c-4768-a0a8-56a79d38d4ec1619684476504.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_53aa154b-b7b4-450f-977e-2c01f8098e041617777589624.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_6c1f460e-2160-447a-b3c9-3e359e044aa11617777602129.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_c24aaa07-837c-4c6e-bc2a-1634816183831617777613786.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_bc42f67e-1898-4b78-b102-22ec9b1de1921617777628829.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_aa916b1a-fb40-41f5-98c5-340eda53cc381617777649656.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_a096d8d2-abab-45df-bf71-729941c011791617777660564.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_9fd3dbf0-f715-44d0-825d-acbb90b2ae801617777674487.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_3f7ea041-d813-4de6-836d-af0f5ef4a4221617777688681.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_20ea6929-1f12-4003-959c-d1620b17c2911617777701937.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_407cb729-d56e-4655-ac58-16e7b621e54f1617777717538.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_3595fca4-3bbb-410d-a58a-9042faaac1b51617777730523.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_d7f71d26-1e44-4a9f-af85-3dfd082142c31617777743556.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_96e9a4b4-1fc8-4f2d-9843-803108f14dab1617777762714.pngEmpty or missing
https://nts.go.kr/upload/nts/fs/img_e3570b68-521e-470b-957e-36704c1659621617777774290.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons2_01.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons2_02.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons2_03.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons2_04.pngEmpty or missing
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https://nts.go.kr/images/web/nts/main/icons2_09.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons2_10.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons4_01.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons4_02.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons4_03.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons3_01.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons3_02.pngEmpty or missing
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https://nts.go.kr/images/web/nts/main/icons3_06.pngEmpty or missing
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https://nts.go.kr/images/web/nts/main/icons3_08.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons3_09.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons3_10.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_01.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_04.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_03.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_05.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_09.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_06.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_10.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_11.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_12.pngEmpty or missing
https://nts.go.kr/images/web/nts/main/icons5_08.pngEmpty or missing
https://nts.go.kr/upload/nts/pm/img_fd604ad4-a719-4922-8824-a89e9d968c111776410237074.png국세청 실시간 접수중 국민제안창구 운영 불합리한 조세제도, 국민의 목소리를 듣습니다! (QR코드 포함)
https://nts.go.kr/images/web/nts/main/img_empty_nb.png2026 국정성과 바로가기 국세청
https://nts.go.kr/images/web/nts/main/img_empty_nb.png(권익위)환경분야 정부지원금 부정수급 집중신고기간 운영
https://nts.go.kr/images/web/nts/main/box2.jpg국세청 전경
https://nts.go.kr/images/web/nts/main/126.png126
https://nts.go.kr/images/web/nts/main/decoBanner02.gif태극기
https://nts.go.kr/images/web/nts/layout/logo1.png국세청
https://nts.go.kr/images/web/nts/layout/wa_mark_2026.png(사)한국장애인단체총연합회 한국웹접근성인증평가원 웹 접근성 우수사이트 인증마크(WA인증마크)
KeywordsFrequency and metadata

Word occurrence counts from extracted content, not search demand or keyword rankings.

안내65 주요서식43 참고자료실35 제도34 동영상자료실30 국세청28 개요28 신고27 질문16 사례15 소개14 연말정산13 컨설팅12 작성요령12 기본정보12 가산세12 부가가치세11 법인세11 사업자등록11 신청11

Meta keywords · 국세청

Meta keywords do not contribute to this tool’s score.

04

Mobile experience

5 checks

Viewport

Passed
width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=3.0,user-scalable=yes

Viewport metadata enables device-width layouts. It is not a test of real mobile layout or touch targets.

Keep in mind

Check width=device-width, then inspect overflow, zoom, forms and buttons on a small screen.

Favicon

Passed
The current check passed.

This detects a link declaration for a browser icon, rather than verifying its rendered appearance.

Keep in mind

Check that the icon file loads and remains recognizable on light and dark browser surfaces.

Apple touch icon

Needs review
The expected configuration was not detected.

This detects a touch icon declaration for saved home-screen shortcuts.

Recommended action

Review the icon’s dimensions, padding and background, then inspect it on an actual device.

Targets and suggested changes

Targethttps://nts.go.kr/

Response HTML <head>

Prepare a home-screen icon and declare its real path rather than adding a tag without a file.

View evidence and example changes
Example - adapt to the actual content and environment
<link rel="apple-touch-icon" href="/apple-touch-icon.png">

Modern images

Needs review
0/85

This detects WebP/AVIF from img src/srcset extensions and picture source types. Images whose format cannot be inferred from HTML, such as extensionless CDN URLs, may not be reflected in the count.

Recommended action

Compare quality and file size, and inspect the actual delivered format in browser developer tools.

Targets and suggested changes

Targethttps://nts.go.kr/images/web/nts/main/eg_logo.png

HTML response line 51 · /html/body/div[2]/div/p/img

Convert this file to WebP/AVIF and use the actual converted URL. Do not merely rename its extension. Keep it if the CDN already serves a modern format.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/eg_logo.png" alt="태극기">
Example - adapt to the actual content and environment
<picture>
  <source srcset="[converted-image.webp]" type="image/webp">
  <img src="https://nts.go.kr/images/web/nts/main/eg_logo.png" alt="태극기">
</picture>

Targethttps://nts.go.kr/images/web/nts/layout/icon-keyboard.png

HTML response line 97 · /html/body/div[3]/header/div[2]/div/div[3]/form/fieldset/button[1]/img

Convert this file to WebP/AVIF and use the actual converted URL. Do not merely rename its extension. Keep it if the CDN already serves a modern format.

View evidence and example changes
Observed content
<img src="/images/web/nts/layout/icon-keyboard.png" alt="키보드">
Example - adapt to the actual content and environment
<picture>
  <source srcset="[converted-image.webp]" type="image/webp">
  <img src="https://nts.go.kr/images/web/nts/layout/icon-keyboard.png" alt="키보드">
</picture>

Targethttps://nts.go.kr/images/web/nts/main/icon_sns06.png

HTML response line 516 · /html/body/div[3]/header/div[4]/div/div[2]/ul/li[1]/a/img

Convert this file to WebP/AVIF and use the actual converted URL. Do not merely rename its extension. Keep it if the CDN already serves a modern format.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/icon_sns06.png" alt="유투브">
Example - adapt to the actual content and environment
<picture>
  <source srcset="[converted-image.webp]" type="image/webp">
  <img src="https://nts.go.kr/images/web/nts/main/icon_sns06.png" alt="유투브">
</picture>

Targethttps://nts.go.kr/images/web/nts/main/icon_sns09.png

HTML response line 517 · /html/body/div[3]/header/div[4]/div/div[2]/ul/li[2]/a/img

Convert this file to WebP/AVIF and use the actual converted URL. Do not merely rename its extension. Keep it if the CDN already serves a modern format.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/icon_sns09.png" alt="인스타그램">
Example - adapt to the actual content and environment
<picture>
  <source srcset="[converted-image.webp]" type="image/webp">
  <img src="https://nts.go.kr/images/web/nts/main/icon_sns09.png" alt="인스타그램">
</picture>

Targethttps://nts.go.kr/images/web/nts/main/icon_sns02.png

HTML response line 518 · /html/body/div[3]/header/div[4]/div/div[2]/ul/li[3]/a/img

Convert this file to WebP/AVIF and use the actual converted URL. Do not merely rename its extension. Keep it if the CDN already serves a modern format.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/icon_sns02.png" alt="페이스북">
Example - adapt to the actual content and environment
<picture>
  <source srcset="[converted-image.webp]" type="image/webp">
  <img src="https://nts.go.kr/images/web/nts/main/icon_sns02.png" alt="페이스북">
</picture>

85 targets; the first five are shown. Review the full saved list in the details below.

Lazy loading

Needs review
0/85

This detects loading="lazy" on img elements. Pages with few images can pass the tool’s heuristic without it.

Recommended action

Consider lazy loading below-the-fold images while keeping prominent first-screen images promptly available.

Targets and suggested changes

Targethttps://nts.go.kr/images/web/nts/main/eg_logo.png

HTML response line 51 · /html/body/div[2]/div/p/img

Add loading="lazy" only if this image is below the initial viewport. Keep prominent initial-viewport images eager.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/eg_logo.png" alt="태극기">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/images/web/nts/main/eg_logo.png" alt="태극기" loading="lazy">

Targethttps://nts.go.kr/images/web/nts/layout/icon-keyboard.png

HTML response line 97 · /html/body/div[3]/header/div[2]/div/div[3]/form/fieldset/button[1]/img

Add loading="lazy" only if this image is below the initial viewport. Keep prominent initial-viewport images eager.

View evidence and example changes
Observed content
<img src="/images/web/nts/layout/icon-keyboard.png" alt="키보드">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/images/web/nts/layout/icon-keyboard.png" alt="키보드" loading="lazy">

Targethttps://nts.go.kr/images/web/nts/main/icon_sns06.png

HTML response line 516 · /html/body/div[3]/header/div[4]/div/div[2]/ul/li[1]/a/img

Add loading="lazy" only if this image is below the initial viewport. Keep prominent initial-viewport images eager.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/icon_sns06.png" alt="유투브">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/images/web/nts/main/icon_sns06.png" alt="유투브" loading="lazy">

Targethttps://nts.go.kr/images/web/nts/main/icon_sns09.png

HTML response line 517 · /html/body/div[3]/header/div[4]/div/div[2]/ul/li[2]/a/img

Add loading="lazy" only if this image is below the initial viewport. Keep prominent initial-viewport images eager.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/icon_sns09.png" alt="인스타그램">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/images/web/nts/main/icon_sns09.png" alt="인스타그램" loading="lazy">

Targethttps://nts.go.kr/images/web/nts/main/icon_sns02.png

HTML response line 518 · /html/body/div[3]/header/div[4]/div/div[2]/ul/li[3]/a/img

Add loading="lazy" only if this image is below the initial viewport. Keep prominent initial-viewport images eager.

View evidence and example changes
Observed content
<img src="/images/web/nts/main/icon_sns02.png" alt="페이스북">
Example - adapt to the actual content and environment
<img src="https://nts.go.kr/images/web/nts/main/icon_sns02.png" alt="페이스북" loading="lazy">

85 targets; the first five are shown. Review the full saved list in the details below.

05

Technical checks

8 checks

Doctype

Passed
html

The doctype declaration helps browsers render HTML in standards mode.

Keep in mind

Place <!doctype html> at the start of the document and check for unintended output before it.

CSS files

Passed
3

Tool heuristic: up to 4 external files

This counts external stylesheet declarations. Count alone does not measure transfer size, caching or render blocking.

Keep in mind

Inspect duplicate or unused CSS and render blocking, then prioritize changes using actual performance measurements.

JavaScript files

Needs review
10

Tool heuristic: up to 6 external files

This counts script elements with src attributes. File count alone cannot measure execution cost or responsiveness.

Recommended action

Review duplicated scripts and expensive startup work; consider defer, async or delayed execution where appropriate.

Targets and suggested changes

Targethttps://nts.go.kr/common/js/jquery-3.1.1.min.js

HTML response line 18 · /html/head/script[1]

This file is referenced by the page. Find duplicate tags and remove or conditionally load files that are unused here. File count alone does not establish a defect in this file.

View evidence and example changes
Observed content
<script src="/common/js/jquery-3.1.1.min.js"></script>

Targethttps://nts.go.kr/common/js/jquery.bxslider.js

HTML response line 21 · /html/head/script[2]

This file is referenced by the page. Find duplicate tags and remove or conditionally load files that are unused here. File count alone does not establish a defect in this file.

View evidence and example changes
Observed content
<script src="/common/js/jquery.bxslider.js"></script>

Targethttps://nts.go.kr/common/js/slick.js

HTML response line 22 · /html/head/script[3]

This file is referenced by the page. Find duplicate tags and remove or conditionally load files that are unused here. File count alone does not establish a defect in this file.

View evidence and example changes
Observed content
<script src="/common/js/slick.js"></script>

Targethttps://nts.go.kr/js/web/nts/layout.js

HTML response line 23 · /html/head/script[4]

This file is referenced by the page. Find duplicate tags and remove or conditionally load files that are unused here. File count alone does not establish a defect in this file.

View evidence and example changes
Observed content
<script src="/js/web/nts/layout.js"></script>

Targethttps://nts.go.kr/js/web/nts/main.js?ver=5

HTML response line 24 · /html/head/script[5]

This file is referenced by the page. Find duplicate tags and remove or conditionally load files that are unused here. File count alone does not establish a defect in this file.

View evidence and example changes
Observed content
<script src="/js/web/nts/main.js?ver=5"></script>

10 targets; the first five are shown. Review the full saved list in the details below.

Compression

Needs review
The expected configuration was not detected.

This checks the HTML Content-Encoding header. Compression can reduce transfer size, with savings depending on the response.

Recommended action

Review text compression on the server or CDN, treating already compressed image formats separately.

Targets and suggested changes

Targethttps://nts.go.kr/

Server / CDN compression settings

Enable actual gzip/Brotli compression for this response and verify transfer size. Do not manually add Content-Encoding without compressing the body.

View evidence and example changes
Example - adapt to the actual content and environment
Content-Encoding: gzip

Security headers

Needs review
0/6

Tool heuristic: at least 3 of 6 selected headers present

This detects selected security-related response headers. Their count does not establish policy quality or protection.

Recommended action

Review CSP, HSTS and other values for the application, then test for blocked resources or broken functionality.

Targets and suggested changes

Targethttps://nts.go.kr/

Web server / CDN response headers

These headers were absent. Configure response headers in the actual server/CDN settings: .htaccess or VirtualHost for Apache, or the Nginx server block. Validate the two example headers first; design CSP/HSTS for the real resources and HTTPS policy. The actual server configuration path is not visible to this tool.

View evidence and example changes
Observed content
strict-transport-security
content-security-policy
x-content-type-options
x-frame-options
referrer-policy
permissions-policy
Example - adapt to the actual content and environment
X-Content-Type-Options: nosniff
Referrer-Policy: strict-origin-when-cross-origin

HTTPS

Passed
https://nts.go.kr/

This checks whether the final analyzed page used HTTPS. It is not a security audit of the whole site.

Keep in mind

Review certificate validity, mixed content and HTTPS on important linked pages and forms.

HTTPS redirect

Needs review
http://nts.go.kr/

This checks whether a request starting over HTTP ends on HTTPS.

Recommended action

Configure consistent HTTP-to-HTTPS redirects and check for unnecessary chains or loops.

Targets and suggested changes

Targethttps://nts.go.kr/

HTTP host redirect configuration

Redirect the HTTP host to working HTTPS using 301/308 while preserving path and query.

View evidence and example changes
Observed content
http://nts.go.kr/
Example - adapt to the actual content and environment
http://nts.go.kr/ → https://nts.go.kr/

W3C validity

Not checked
Not verified in this analysis.

These are HTML validation results from W3C Nu, not a ranking, accessibility or security certification.

Recommended action

Check network restrictions and provider availability before retrying. An unknown result is not a confirmed failure or a zero score.

CSS files and locations3 saved

Up to 100 files per type are saved. File count alone does not establish a defect in any file.

URLHTML response location
https://nts.go.kr/css/web/nts/main.css?ver=917 · /html/head/link[2]
https://nts.go.kr/js/keyboard/keyboard.css29 · /html/head/link[3]
https://nts.go.kr/css/com/jquery-ui/jquery-ui.css32 · /html/head/link[4]
JavaScript files and locations10 saved

Up to 100 files per type are saved. File count alone does not establish a defect in any file.

URLHTML response location
https://nts.go.kr/common/js/jquery-3.1.1.min.js18 · /html/head/script[1]
https://nts.go.kr/common/js/jquery.bxslider.js21 · /html/head/script[2]
https://nts.go.kr/common/js/slick.js22 · /html/head/script[3]
https://nts.go.kr/js/web/nts/layout.js23 · /html/head/script[4]
https://nts.go.kr/js/web/nts/main.js?ver=524 · /html/head/script[5]
https://nts.go.kr/js/common.js?ver=127 · /html/head/script[6]
https://nts.go.kr/js/jquery-ui.min.js28 · /html/head/script[7]
https://nts.go.kr/js/keyboard/keyboard.min.js30 · /html/head/script[8]
https://nts.go.kr/js/search/ntsSearch.js31 · /html/head/script[9]
https://nts.go.kr/js/webtrends.js34 · /html/head/script[10]
Security response headersView values
strict-transport-security
Not found
content-security-policy
Not found
x-content-type-options
Not found
x-frame-options
Not found
referrer-policy
Not found
permissions-policy
Not found
W3C messages0 saved

The external service is unavailable. Please try again later.

06

Search and AI crawlers

4 checks

Robots.txt

Passed
robots.txt

This checks the robots.txt response. File presence does not verify all crawler permissions or actual indexing.

Keep in mind

Review bot and path rules for your intended policy. Protect private information with authentication and access controls.

XML Sitemap

Needs review
The expected configuration was not detected.

This detects a sitemap format at a declared or default URL. It does not crawl and validate every listed URL.

Recommended action

Include intended canonical URLs and meaningful update dates. Declare a custom sitemap location in robots.txt.

Targets and suggested changes

Targethttps://nts.go.kr/sitemap.xml

/sitemap.xml / robots.txt

Generate XML using real canonical URLs and declare the working location in robots.txt. Link an existing custom sitemap instead of duplicating it.

View evidence and example changes
Example - adapt to the actual content and environment
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url><loc>https://nts.go.kr/</loc></url></urlset>

llms.txt

Needs review
The expected configuration was not detected.

This checks for a text response at /llms.txt. Its presence does not guarantee use by an AI service or search visibility.

Recommended action

If you publish one, describe public resources accurately and keep its content and links current.

Targets and suggested changes

Targethttps://nts.go.kr/llms.txt

/llms.txt

If desired, publish UTF-8 text at the root and add real public documentation links. This is optional.

View evidence and example changes
Example - adapt to the actual content and environment
# 국세청

- [Home](https://nts.go.kr/)

AI crawlers

Passed
AI search/answer bots allowed 5/5 · training bots allowed 3/3

Passes when every AI search/answer bot is allowed; training bots are shown for reference only

This interprets root-path robots.txt rules for five AI search/answer bots (which read pages to cite them in answers) and three training bots. Only the search/answer bots decide the result; training bots are shown for reference. Actual citations are not checked.

Keep in mind

Allow the search/answer bots if you want to be cited in AI answers. Blocking training crawlers is a policy choice and does not affect this result.

Bot access to the root path

OAI-SearchBot Search/answerAllowed
ChatGPT-User Search/answerAllowed
Claude-SearchBot Search/answerAllowed
Claude-User Search/answerAllowed
PerplexityBot Search/answerAllowed
GPTBot TrainingAllowed
ClaudeBot TrainingAllowed
Google-Extended TrainingAllowed
robots.txt sourceExpand
User-agent: *
Allow: /
07

PageSpeed Insights

External performance test

Run Google Lighthouse performance, accessibility, best practices and SEO checks. Device-specific results are cached for one day and are separate from the overall score above.