An SEO audit is a structured check of whether search engines can find, read and index your pages, and whether those pages answer real questions. For a small site it can take a day. The output is a short, ranked list of fixes, not a long report.
What does an SEO audit cover?
Audits tend to sprawl, so it helps to split the work into three layers and check them in order. Problems in an earlier layer make later ones irrelevant, because a page that cannot be crawled cannot rank, however good it is.
- Access. Can crawlers reach the pages you want?
- Indexing. Are those pages actually in the index, and are the right versions chosen?
- Content. Does each page answer a question better than what it competes with?
Layer 1: can crawlers reach your pages?
Google says it finds pages mainly through links from pages it already crawled, and describes sitemaps as optional. Check these:
- Your
robots.txtdoes not block pages or resources you want read. See what a robots.txt file should look like. - Every page you care about has at least one link to it. Pages with none are orphan pages.
- Important pages return a 200 status, and removed pages return a real 404 rather than a soft 404.
- Redirects go straight to the final URL, as in fixing redirect chains.
Layer 2: are the right pages indexed?
Google's own starter guide suggests a site: search to see whether your domain is in the index, and the URL Inspection tool in Search Console to see a page the way Google renders it. Both are in the SEO starter guide. Then work through:
- Pages that should be indexed but are not. Start with how to check if a page is indexed.
- Pages marked crawled, currently not indexed or discovered, currently not indexed.
- Duplicate URLs for the same content. The starter guide says duplicates are not a spam violation but waste crawl resources, and recommends redirects or a canonical link to consolidate. See canonical URLs.
- Stray
noindextags left from a staging site. See the noindex tag.
Layer 3: do the pages deserve to rank?
The same guide asks for unique, concise titles that describe the page, and short descriptions specific to one page. Google also gives a set of questions for judging content in its helpful content guidance, including whether the page offers original information and whether a reader would leave feeling they learned enough. For each important page, ask:
- Is there one clear question it answers, and is the answer near the top?
- Is the title unique, and does the description fit this page only?
- Is anything out of date? Update or remove it.
- Does another page on your site target the same question? See keyword cannibalization.
For a deeper content review, follow the content audit method.
What about speed and AI crawlers?
Add two quick checks. Open the Core Web Vitals report and see whether any template is marked poor, using the three metrics explained. Then confirm AI crawlers are not blocked by accident, using the robots.txt guide for ChatGPT and Perplexity.
How do you turn findings into a plan?
Sort every finding by two questions: how many pages does it affect, and how hard is the fix? A single template change that touches 200 pages beats 20 hand edits. Fix in layer order, record the date of each change, and wait a few weeks before judging results. Google notes that changes can take hours or months to show up.
Nightcrop's free audit covers technical health (Core Web Vitals, schema, indexation), content freshness and AI-answer visibility, which is a fast way to see which layer needs attention first.
How often should you audit?
Run the full check once, then a lighter pass each quarter, and after any migration, redesign or CMS change. Those events are when accidental noindex tags and broken redirects appear.
Frequently Asked Questions
How long does an SEO audit take?
For a site under a few hundred pages, one focused day. Larger sites need sampling by template rather than checking every URL.
Do I need paid tools for an audit?
No. Google Search Console and a manual site: search cover access and indexing. Paid crawlers save time on big sites but do not change what you check.
What is the most common problem an audit finds?
Pages that should be indexed but are not, usually caused by a blocked path, a stray noindex or a duplicate version winning. Check indexing before polishing content.
Is an SEO audit the same as a content audit?
A content audit is one part of it. The SEO audit also checks crawling, indexing and technical health.
What do I do after the audit?
Rank fixes by pages affected and effort, make them in layer order, and recheck in a few weeks.