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An independent audit of loc.gov, measured by Adnave on November 13, 2026. We read 12 pages of the site as a search engine first receives them and ran 53 checks. Organic health is 90 out of 100. The site lets the main AI assistants read it.
Growth Navigator · loc.gov
12 opportunities to improve
12 pages read in full, 30 more links checked
Organic health
out of 100
Ads readiness
out of 100
Our suggested order: biggest obstacles first, quickest first among equals. The effect of each fix is not measured. 5 take minutes.
Step 1 · Organic
Everything here was observed on the site. Fixing it removes a known obstacle; no one can promise a specific ranking in return.
Observed · AdnaveBot's reading of 12 pages on 2026-11-13 · each finding is what we saw on those pages; “what to do”, the score and the order are our judgment
There is no structured data, so an assistant has to guess what the business is from loose text.
What to do: Add schema.org markup for the organisation, plus the type that fits the page: Product, Service, Article, FAQPage or SoftwareApplication.
Paste inside the <head> of the page. Fill in the name and logo address.
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Organization",
"name": "loc.gov",
"url": "https://www.loc.gov",
"logo": "https://www.loc.gov/your-logo.png"
}
</script>Without a width and height, the page shifts as each image arrives. That is the layout shift Core Web Vitals penalise.
What to do: Add width and height attributes to every image tag.
How to fix this: Image SEO: alt text, file size and layout shiftThese scripts must download and run before anything is shown.
What to do: Add defer or async to scripts in the page head, or move them to the end.
How to fix this: Core Web Vitals: how to make a slow website fastWithout it, copies of the page (with tracking codes, for example) can compete with each other in search.
What to do: Add a canonical link pointing at the page’s preferred address.
Paste inside the <head> of the page.
<link rel="canonical" href="https://www.loc.gov/">
Structured data lets Google show extras such as ratings, prices, opening hours and FAQs in your result.
What to do: Add schema.org markup that fits the business (Organization, LocalBusiness, Product, FAQ).
Paste inside the <head> of the page. Fill in the name and logo address.
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Organization",
"name": "loc.gov",
"url": "https://www.loc.gov",
"logo": "https://www.loc.gov/your-logo.png"
}
</script>Search engines and screen readers use a link's words to understand the page it leads to. “Learn more” tells them nothing.
What to do: Reword each link to name its destination, for example “See our pricing” instead of “Learn more”.
An icon-only link or button with no text is invisible to screen readers and tells search engines nothing about where it leads.
What to do: Add an aria-label saying what it does, for example aria-label="Open menu", or alt text on the image inside it.
The server did not report compressing the page.
What to do: Turn on gzip or Brotli compression on the server or host.
How to fix this: Core Web Vitals: how to make a slow website fastLinks shared on X will show as plain text.
What to do: Add a twitter:card meta tag (summary_large_image works for most pages).
Paste inside the <head> of the page. Replace the image address with a picture of 1200 by 630 pixels.
<meta property="og:type" content="website"> <meta property="og:title" content="Home | Library of Congress"> <meta property="og:description" content="The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office."> <meta property="og:url" content="https://www.loc.gov/"> <meta property="og:image" content="https://www.loc.gov/your-preview-image.png"> <meta name="twitter:card" content="summary_large_image">
Assistants quote pages that state a question and answer it plainly. This page has no question-style headings.
What to do: Add a short section of real customer questions as headings, each answered in two or three sentences.
How to fix this: AI search readiness: how to be found by AI assistantsThe page does not declare a favicon.
What to do: Add a favicon link so your brand shows in tabs, bookmarks and mobile results.
Paste inside the <head> of the page. Put the icon file at that address first.
<link rel="icon" href="/favicon.ico">
An optional plain-text summary of the site for AI assistants. It is cheap to add, but there is no evidence yet that it changes how often a site is cited.
What to do: Optionally add /llms.txt with a short description of the site and links to its most important pages.
Optional. Save as llms.txt at the top level of the site. Edit the first lines to describe what you do.
# Home | Library of Congress > The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office. ## Pages - [Home | Library of Congress](https://www.loc.gov/) - [Discover the Library of Congress | Library of Congress](https://www.loc.gov/discover/) - [Visiting the Library | Library of Congress](https://www.loc.gov/visit/) - [Education Resources from the Library of Congress | Library of Congress](https://www.loc.gov/education/) - [Connect with the Library of Congress | Library of Congress](https://www.loc.gov/connect/) - [About the Library of Congress | Library of Congress](https://www.loc.gov/about/) - [Help Resources | Library of Congress](https://www.loc.gov/help/) - [America 250 at the Library of Congress | Topics | Library of Congress](https://www.loc.gov/topics/america-250-at-the-library-of-congress)
“Home | Library of Congress”
“The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office.”
“The Library of Congress Homepage”
Subheadings help readers and search engines scan the page.
The page gives search engines real content to work with.
Alt text helps image search and screen-reader users.
Without the doctype line, browsers fall back to an old rendering mode and layouts can break.
Without it, accented letters and symbols can show as garbled text, in the browser and in search results.
Search engines treat this kind of redirect as a weak signal and visitors see a flash of the old page. It also breaks the back button.
Headings are the page's outline. When levels are skipped (a heading 2 followed by a heading 4), screen readers and search engines get a broken outline.
A field with no label is announced to screen-reader users as just “edit text”, and placeholder text disappears as soon as someone types. Clear labels also raise form completion.
Visitors and search engines get a secure connection.
Nothing on the page blocks it from being indexed.
The page declares a mobile viewport.
Search engines and screen readers know which language to expect.
Search engines have instructions for crawling the site.
Search engines have a list of your pages.
Visitors who type http:// are moved to https automatically.
Both forms end at www.loc.gov.
A made-up address correctly returns a 404, so search engines can drop dead pages.
Browsers are told to always use the secure connection and not to guess file types.
Images, scripts and styles all load over https.
That is quick.
A reasonable size for the page itself, before images.
Shared links show a title, description and image on Facebook, WhatsApp, LinkedIn and others.
Nothing in robots.txt shuts out the crawlers behind ChatGPT, Claude, Perplexity or Gemini.
Every internal link we followed loads. 31 more could not be checked because the site refused or slowed our visits; they are not counted as broken.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
Checked 7 other pages.
| Page | Response | Time | Words |
|---|---|---|---|
Home | Library of Congress https://www.loc.gov/ | 200 | 0.03s | 845 |
Discover the Library of Congress | Library of Congress https://www.loc.gov/discover/ | 200 | 0.09s | 465 |
(no title) https://www.loc.gov/services-and-programs/ | 403 | 0.02s | 0 |
Visiting the Library | Library of Congress https://www.loc.gov/visit/ | 200 | 0.05s | 1,318 |
Education Resources from the Library of Congress | Library of Congress https://www.loc.gov/education/ | 200 | 0.02s | 325 |
Connect with the Library of Congress | Library of Congress https://www.loc.gov/connect/ | 200 | 0.04s | 710 |
About the Library of Congress | Library of Congress https://www.loc.gov/about/ | 200 | 0.03s | 753 |
Help Resources | Library of Congress https://www.loc.gov/help/ | 200 | 0.01s | 206 |
(no title) https://www.loc.gov/contact/ | 403 | 0.06s | 0 |
America 250 at the Library of Congress | Topics | Library of Congress https://www.loc.gov/topics/america-250-at-the-library-of-congress | 200 | 0.02s | 5,208 |
(no title) https://www.loc.gov/programs/the-source/about-this-program/ | 403 | 0.01s | 0 |
(no title) https://www.loc.gov/live/ | 403 | 0.04s | 0 |
Step 2 · Ads
Ads only pay off when the site can measure what they bring in. We look for tracking tags in the page code; tags that load later, through a consent banner or tag manager, will not show up here.
Without analytics you cannot see where visitors come from or what they do.
What to do: Set up Google Analytics 4 and add its tag to every page.
How to fix this: What to set up before you spend on adsGoogle Ads cannot learn which clicks turn into customers without it.
What to do: Create a conversion action in Google Ads and add the tag, or import conversions from Analytics.
How to fix this: What to set up before you spend on adsFacebook and Instagram ads need the Pixel to track sales and build audiences.
What to do: Create a Pixel in Meta Events Manager and add it to every page.
How to fix this: What to set up before you spend on adsTikTok ads need the Pixel to measure results and optimize delivery.
What to do: Create a Pixel in TikTok Ads Manager and add it to every page.
How to fix this: What to set up before you spend on adsAudit run on . It reads up to 12 pages (60 with a free account) as a search engine first receives them and checks further internal links for errors. Scores are a weighted share of the checks passed.
Run the same audit on your own site, free. No sign-up needed.
This page reports only what our audit observed on public pages of loc.gov. Adnave is not affiliated with it. If you run this site and something here is wrong, run a fresh audit and tell us.