404 errors are a normal part of website maintenance, but too many of them can create a poor user experience and make technical SEO audits harder to manage. A good 404 checker tool helps you find broken internal links, missing pages, and crawl issues before they become a larger problem for search visibility.
For website owners, SEO beginners, agencies, and ecommerce teams, the value is not just in spotting errors. It is in understanding which broken URLs matter, whether they are linked internally, and how they affect crawling, indexing, and site quality. The right tool depends on your site size, workflow, and how deeply you need to audit.
What a 404 checker tool does in an SEO audit
A 404 checker scans your website or reports on broken URLs that return a “not found” response. In technical SEO, this is useful because search engines still follow internal links, crawl old URLs, and encounter pages that no longer exist. If those URLs are important, or linked from menus, articles, category pages, or product pages, they can waste crawl budget and disrupt user journeys.
Some tools focus on checking a list of URLs, while others crawl your whole site and identify broken internal links, redirected pages, and soft 404s. For audits, that broader view is often more useful because it shows where the issue sits in the site structure rather than only confirming that a single page is missing.
It is also helpful to pair 404 checks with broader SEO data. For example, Google Search Console can show indexed pages and crawl issues, while a free website SEO audit can help you review technical issues in a structured way. Tools support the process, but they do not replace judgment about whether a URL should be restored, redirected, or left as a proper 404.
Best tool types to consider for broken link checks
There is no single tool that suits every site. Instead, the best choice depends on how you work and what you need to monitor.
Website crawler tools
Crawlers such as Screaming Frog SEO Spider are useful for technical SEO audits because they can scan internal links at scale and surface 404 errors alongside other issues like redirect chains, duplicate content, and missing metadata. This is especially useful for large sites, ecommerce stores, and migration work.
Free SEO tools and search console data
Free tools are often enough for smaller sites or regular checks. Google Search Console is particularly useful for identifying pages that Google has discovered but cannot crawl properly. The official Google Search Console interface is a sensible starting point for monitoring coverage and indexing issues, and it works well alongside browser-based or desktop 404 tools.
SEO Chrome extensions and quick checks
For smaller tasks, SEO Chrome extensions can help you inspect a page, test links, or review page elements without running a full crawl. These are practical for editors, bloggers, and consultants who need a fast way to investigate a page before sending it to development.
Reporting and monitoring tools
If you need repeatable reporting, look for tools that export clean data into spreadsheets or dashboards. Google Analytics 4 can also help you understand user behaviour on broken landing paths, although it will not tell you about every broken link directly. For ongoing reporting, many teams combine crawl data with Looker Studio to create clearer audit summaries.
How to choose the right 404 checker
When comparing tools, focus on practical needs rather than features that sound impressive on paper.
Check crawl depth and site size: A small brochure site may only need a lightweight checker, while a large ecommerce site or WordPress network may need a crawler with scheduling, filters, and exports.
Look at data quality: A tool should clearly separate true 404s from redirected URLs, blocked pages, and server errors. If the output is messy, your audit will take longer and become less reliable.
Consider workflow: If your team uses spreadsheets, Content Management Systems, or project management software, choose a tool that exports data in a format you can act on easily.
Think about support for other SEO tasks: A crawler that also helps with internal links, schema markup checks, duplicate content, and indexability may give more value than a tool that only flags broken pages. Many teams prefer multipurpose technical SEO tools because they reduce the number of separate checks needed.
Use budget carefully: Free tools are helpful, but they may limit crawl volume, reporting, or historical tracking. Paid tools can be worth it if you need deeper audits, scheduled monitoring, or agency reporting, but only if those features match your actual workflow.
Common 404 issues to look for in technical SEO
Not every 404 is a problem. The key is identifying the ones that affect users or search engines.
- Broken internal links in navigation, footers, and body content
- Outdated product pages on ecommerce sites
- Deleted blog posts that still receive internal links
- Typos in URLs from content editors or migrations
- Broken backlinks from external websites
- Incorrect redirects that lead to chains or loops
- Soft 404s where a page returns a 200 status but behaves like an error page
For ecommerce SEO, 404 checks are especially important during product removal, category restructuring, and seasonal stock changes. For WordPress sites, plugin updates, permalink changes, and old media URLs can also create broken paths. Local SEO pages and location pages can produce similar issues if addresses or service areas change.
Best practice workflow for audits and fixes
A sensible workflow starts with discovery and ends with action. First, crawl the site and export all 404 URLs. Then group them by source: internal links, external links, old campaigns, or deleted content. Next, decide whether each URL should be restored, redirected, updated in internal links, or left as a genuine 404.
Use redirects carefully. Redirecting every missing page to the homepage is rarely the best option and can create poor user signals. A better approach is to send users to the closest relevant page when one exists. If no suitable replacement exists, a well-designed 404 page is usually better than a misleading redirect.
Also review related technical SEO tools during the same audit. PageSpeed Insights and Core Web Vitals tools help you understand performance, schema markup tools help with rich result validation, and rank tracking tools can show whether important pages are stable after fixes. A broken-link issue is often just one part of a wider site health review.
Conclusion
The best 404 checker tool for technical SEO audits is the one that fits your site size, audit depth, and reporting needs. Free tools are often enough for basic monitoring, while crawlers and broader SEO platforms are better for larger sites and recurring audits. What matters most is not just finding broken pages, but understanding why they are broken and how they affect users, crawling, and site structure.
If you want to improve search visibility in a measured way, make 404 checks part of a regular audit process alongside analytics, crawl data, and content updates. For teams building a wider SEO workflow, Backlink Works can be one part of that toolkit, but the real value still comes from consistent implementation and sensible prioritisation.
Frequently Asked Questions
How often should I check for 404 errors?
Check them regularly, especially after site updates, migrations, product changes, or content removals. Larger sites often need more frequent reviews.
Are all 404 errors bad for SEO?
No. Some 404s are normal and acceptable. The main concern is broken internal links, important pages that should exist, and errors that affect crawl paths.
Can Google Search Console find 404 pages?
Yes, it can show pages that Google has discovered but could not find. It is useful, but it should be combined with a crawler for a fuller audit.
Should I redirect every 404 page?
No. Only redirect when there is a clear, relevant destination. Otherwise, keep the 404 response and improve the page or link structure.
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