Internal Link Checker: How to Audit Your Site's Internal Links Free

Internal links are the quiet half of SEO. Backlinks get all the attention, but the links within your own site are what let search engines discover your pages, understand how they relate, and decide which ones matter. When that internal structure is weak, good pages go unfound — and you can’t fix what you can’t see. An internal-link check makes it visible. The good news: you don’t need a paid crawler or a desktop install to run one.

What an internal link checker actually does

You can’t judge internal linking by looking at one page, because it’s a property of the whole link graph — which page points to which, and how authority flows across the network. A checker crawls your site the way a search engine would, follows every internal link, builds that graph, and then reports where it’s broken. The useful ones don’t just dump a spreadsheet of links; they turn the graph into findings you can act on.

What a good internal link audit measures

Four signals do most of the work, and a solid checker reports all four:

• Orphan pages. Pages with no inbound internal links at all. Crawlers rarely find them and readers can’t click to them, so the work sits unread. (See the deeper guide on finding orphan pages.)
• Click depth. How many clicks a page sits from the homepage. Pages buried deep get crawled less and earn less internal authority. Depth should track importance — your key pages should be the shallowest.
• Anchor text. Whether your internal links use descriptive, varied anchors or a sea of “click here” and “read more.” Anchor text tells search engines what the target page is about.
• Hub strength and authority flow. Whether a few well-connected hub pages concentrate and pass authority to the pages beneath them, or whether it’s spread thin across hundreds of equal links.

How to run a free internal-link audit, step by step

The whole process, with nothing to install:

1. Crawl the site. Paste your URL into Crawlmouse. It crawls the live site, builds the internal-link graph, and returns a single A–F grade plus the specific problems behind it — in the browser, no account or download.
2. Read the grade, then the findings. The grade is the headline; the value is in the list underneath — the orphans, the deep pages, the weak hubs. Start where the impact is highest.
3. Fix the cheap, high-leverage problems first. A single contextual link from a shallow, relevant page can lift a buried page several levels and rescue an orphan in one move.
4. Re-crawl to confirm. Internal-linking fixes are one of the few SEO changes whose effect you can see in your site’s structure immediately, long before rankings catch up. Run it again and watch the grade move.

Free checker vs. Screaming Frog vs. Semrush

The big desktop and suite tools are genuinely powerful and do far more than internal linking — but they carry a cost and a setup tax. Screaming Frog is a desktop install whose free version stops at 500 URLs, with the deeper reports behind an annual per-user licence. Semrush is a full paid subscription. If what you actually need right now is to check and grade your internal linking, a free browser tool does exactly that with nothing to install, no seat licence, and no 500-URL wall for the structure view. Reach for the heavy suites when you need their breadth; reach for a focused free checker when you need the internal-linking answer fast. (More on the no-install alternative.)

One honest note on what a checker can and can’t promise

An internal-link audit improves discoverability — whether your pages can be found, crawled, and understood. It doesn’t guarantee rankings; nothing honestly can. What it does is remove the structural reasons a good page fails to rank, so the content you already made gets a fair chance. One more reason it matters now: the AI crawlers behind ChatGPT, Claude, and Perplexity read your raw HTML and follow the links in it. A checker that grades the static HTML shows you the site those crawlers actually see — which is increasingly where discovery happens.