Internal Links Crawlers Can't Follow: Fix, Redirect, or Remove

Internal links are how search engine crawlers move through your site.

When a link points somewhere a crawler cannot follow, the destination page loses one of its discovery paths, and the crawl budget you spend on the link is wasted.

This article explains the common causes of uncrawlable internal links, how to find them, and how to decide between fixing, redirecting, or removing each one.

What makes an internal link uncrawlable

A crawler follows links by reading the HTML of a page and requesting each URL it finds in an anchor tag.

A link becomes uncrawlable when something in that chain breaks.

The URL may be blocked from crawling, built with JavaScript the crawler cannot process, or malformed in a way that creates duplicates or dead ends.

The practical consequence is the same in every case.

The destination page either cannot be discovered through that link at all, or the crawler reaches a URL variant that adds no value.

Both outcomes weaken the internal linking structure that helps search engines understand which pages matter.

Common causes, and what each one means

Blocked by robots.txt

If a URL is disallowed in your robots.txt file, a compliant crawler will not request it.

That is the intended behavior for pages you genuinely want kept out of crawling, such as internal search results.

Screaming Frog's documentation notes that search engines recommend blocking internal search pages from crawling (source:1).

To keep those blocked URLs out of the index, they should not be discoverable via internal links either (source:1).

The trap is linking to a blocked URL from a page you do want crawled.

The crawler sees the link, cannot follow it, and the destination page loses that discovery path.

If the blocked page is important, the fix is not to remove the robots.txt rule blindly; it is to decide whether the page should be crawlable at all.

JavaScript-based links and redirects

Links that only exist after JavaScript runs, or redirects implemented in JavaScript, may not be followed depending on how the crawler renders the page.

Screaming Frog treats these as distinct issue categories (source:2).

They include pages containing JavaScript links, JavaScript redirects, and pages whose content or title exists only in rendered HTML (source:2).

The safe pattern is a standard anchor tag with an href attribute pointing at the final URL, and a server-side redirect when a URL has moved.

JavaScript navigation can work for users, but it should not be the only path to an important page.

URL hygiene problems

Several URL defects create crawl waste even when the link technically resolves.

Screaming Frog flags multiple forward slashes in a path, repeated path segments, spaces in URLs, and URLs over 115 characters as issues worth reviewing (source:1).

Spaces are considered unsafe and can break the link when the URL is shared.

Repeated paths often point to incorrect relative linking, which can generate infinite URL variants.

Tracking parameters on internal links deserve special attention.

Screaming Frog's guidance explains that internal links carrying Google Analytics tracking parameters create duplicate pages that must be crawled (source:1).

Utm parameters strip the original traffic source and start a new session, while _ga and _gl parameters interfere with unique user identification (source:1).

Internal links should point at clean, canonical URLs.

Broken bookmarks

Fragment links that jump to a specific section of a page can break when the target ID is changed or removed during page updates.

Screaming Frog notes that a broken bookmark still takes the user to the correct page, just not the intended section (source:1).

Google treats these URLs as the same page because it ignores everything after the hash (source:1).

These are lower severity than blocked or JavaScript-only links, but they are worth cleaning up during a review.

How to find uncrawlable internal links

A crawler audit is the reliable way to surface these problems.

Screaming Frog's SEO Spider includes a dedicated issue called Pages With Uncrawlable Internal Outlinks (source:2).

Related checks cover internal links blocked by robots.txt, JavaScript links, JavaScript redirects, and nofollow-only internal inlinks (source:2).

A practical review sequence:

• Crawl the site and filter for pages with uncrawlable internal outlinks, then trace each flagged link back to its source page.
• Check whether the destination is blocked by robots.txt, and whether that block is intentional.
• Review JavaScript link and redirect reports to find navigation that only works after rendering.
• Scan URL hygiene filters for spaces, multiple slashes, repeated paths, and tracking parameters on internal links.
• Confirm that every page you want indexed has at least one crawlable internal link pointing at it.

For a broader pre-publish review, a crawlability checklist that covers internal links, redirects, and indexability directives will catch most of these before they ship.

Fix, redirect, or remove: choosing the right response

Once you have a list of problem links, each one falls into one of three responses.

The decision depends on whether the destination page should exist and be crawlable.

Fix the link

Fix when the destination page is valuable and should be crawlable, but the link itself is defective.

Typical fixes:

• Replace a JavaScript-only link with a standard anchor tag and href.
• Point the link at the clean, canonical URL instead of a parameterized or duplicated variant.
• Remove tracking parameters from internal links and rely on your analytics platform's own session handling.
• Repair or remove broken bookmark fragments, or update them to the current section ID.
• If the destination is blocked by robots.txt but should be crawlable, remove the disallow rule and verify the page is then reachable.

Redirect the link target

Redirect when the page has moved or a URL variant exists.

Update the link to point directly at the final URL rather than relying on a redirect chain, because chains add latency and can break again.

If a JavaScript redirect is currently the only mechanism, replace it with a server-side redirect.

Where the old URL must keep working for external visitors, keep the redirect in place, but make internal links point at the destination itself.

Remove the link

Remove when the destination should not be linked at all.

Internal search results are the clearest case: they should be blocked from crawling and should not be discoverable through internal links (source:1).

The same logic applies to utility pages, filtered URL variants with no unique value, and staging or administrative URLs that leaked into navigation.

Removing a link is also the right call when the destination page is being retired.

In that case, decide whether the page should redirect to a relevant replacement or simply be dropped from navigation.

Do not leave a link pointing at a page that returns an error.

Tradeoffs worth weighing

Not every flagged link is equally urgent.

A broken bookmark degrades the user experience slightly but does not remove a page from discovery.

A robots.txt block on an important resource, or navigation that only exists in JavaScript, can keep entire sections of a site from being crawled efficiently.

Prioritize issues that cut off discovery paths over issues that only create minor duplication.

There is also a tradeoff between cleanup speed and risk.

Mass-editing internal links across a large site can introduce new errors.

Fix high-traffic and high-value pages first, verify the crawl results improve, then work through the long tail.

Finally, remember that fixing links is necessary but not sufficient.

A page also needs a reason to exist, useful content, and a clear role in your site structure.

Internal linking repairs amplify pages that deserve visibility; they do not substitute for them.

Making this part of routine publishing

The cheapest time to catch an uncrawlable link is before publication.

A short pre-publish check covers the highest-frequency failures:

1. Confirm every link uses a standard anchor tag with a clean href.
2. Confirm the destination URL is not blocked by robots.txt unless the block is intentional.
3. Confirm internal links carry no utm or cross-domain tracking parameters.
4. Confirm the URL has no spaces, no doubled slashes, and no repeated path segments.
5. Confirm the destination resolves directly, without a redirect chain.

Teams that publish at volume often fold these checks into their content operations so crawlability issues are caught at the source rather than discovered in a quarterly audit.

The same discipline applies to internal linking strategy more broadly: links should be added deliberately, with descriptive anchors, and reviewed when pages move or are retired.

Where this fits in your wider workflow

Internal link health is one layer of technical SEO, but it connects directly to how your team plans topics, publishes content, and routes visitors toward conversion.

If you are building internal links at scale, it is worth understanding how to automate internal links without creating spam.

Automated linking can reintroduce the exact defects described here if it is not reviewed.

For teams coordinating marketing and sales, crawlability problems on key pages also affect lead routing.

A page crawlers cannot reach may still convert paid or referral traffic while remaining invisible in organic search.

• Learn how to automate internal links without creating spam, including when automated suggestions need editorial review.
• See the founder SEO playbook on keywords, content, links and conversion for how internal linking fits into a broader organic strategy.
• Understand how to run A/B tests on search pages safely, since experiments can introduce cloaking and redirect risks that interact with crawlability.
• Review CRM automation services for lead routing and follow-up to connect organic discovery with sales follow-through.

Uncrawlable internal links are rarely dramatic on their own, but left unaddressed they quietly narrow the paths search engines can take through your site.

Audit with a crawler, classify each finding as fix, redirect, or remove, and build the pre-publish checks that keep new defects out.

Source references: www.screamingfrog.co.uk; www.screamingfrog.co.uk.

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