Contents
- What is a 404 error?
- Why does the 404 error matter?
- What are the causes of an HTTP 404 error?
- How do you diagnose a 404 error?
- Solutions to fix an HTTP 404 error
- Best practices to avoid 404 errors
- Impact on Google's crawl budget
- Example of a successful 404 page
- Impact on your site's reputation
- How do you monitor and automate the handling of 404 errors?
- Creating a 302 vs 301 redirect: What's the difference?
- FAQ: Frequently asked questions about the HTTP 404 error
- Conclusion:
The 404 error, often called "Page Not Found", is one of the most common problems on websites. Not only does it negatively affect the user experience, but it can also harm your site's search engine optimization (SEO).
In this article, we will explore:
- The main causes of a 404 error.
- Its impact on SEO.
- Practical solutions to prevent or fix this error.
Need help with other errors? Check out our complete guides on the 500, 403, 502, 504, 429, 401, 400 and 410 HTTP errors to understand their causes, impacts and solutions.
What is a 404 error?
The HTTP 404 error occurs when a user tries to access a page or resource that does not exist or is no longer available on a website.
Why does the 404 error matter?
Impact on the user experience:
• Visitors may feel frustrated and leave your site quickly.
• This can increase your bounce rate, which sends a negative signal to search engines.
Impact on SEO:
• Google doesn't like broken links. If your site contains many 404 errors, it can affect your ranking in search results.
• Crawlers (Googlebot) waste "crawl budget" on non-existent pages.
What are the causes of an HTTP 404 error?
1. Broken links:
• Internal or external links pointing to a URL that no longer exists.
2. Deleted or moved resources:
• A page or file has been deleted or moved without a redirect.
3. Mistyped URL:
• Users or search engines enter an incorrect address.
4. Server or configuration issues:
• A misconfigured server can trigger 404 errors.
How do you diagnose a 404 error?
1. Google Search Console:
• Use the "Coverage" tool to identify the not-found pages reported by Google.
2. Link-checking tools:
• Tools such as Dead Link Checker or Screaming Frog.
3. Browser developer console:
• Go to the "Network" tab to see errors when resources load.
Solutions to fix an HTTP 404 error
1. Set up a 301 redirect
• If a page has been moved or deleted, redirect the old URL to the new one.
• Example of a redirect in the .htaccess file (Apache):
Redirect 301 /ancienne-page.html /nouvelle-page.html
2. Créer une page 404 personnalisée
• An attractive and helpful 404 page can improve the user experience.
• Include elements such as:
• A clear message: "Oops, this page doesn't exist!"
• A link to the homepage or an internal search.
• Example:
<h1>Page non trouvée</h1>
<p>La page que vous recherchez semble introuvable.</p>
<a href="/">Retourner à l'accueil</a>
3. Fix broken links
• Regularly scan your site to detect broken links and fix them.
• For internal links, update the URLs.
• For external links, redirect to alternatives or remove them.
4. Check the sitemap.xml file
• Make sure all the URLs in your sitemap are valid.
• Use a tool such as XML Sitemap Validator.
Best practices to avoid 404 errors
1. Check your links regularly:
• Schedule monthly audits with a tool such as Screaming Frog.
2. Use a reliable CMS:
• Systems like WordPress offer plugins to monitor 404 errors (e.g. Redirection).
3. Test your changes before deployment:
• Especially after updates or migrations.
Impact on Google's crawl budget
An often-overlooked aspect of the HTTP 404 error is its effect on the crawl budget. Crawlers such as Googlebot have a limit on the number of pages they can explore on your site over a given period. This limit is called the "crawl budget".
If crawlers regularly land on 404 pages, they waste this precious budget on non-existent pages instead of visiting your new pages or the ones you want to rank in search results.
How can you avoid this?
• Quickly fix the 404 errors identified in Google Search Console.
• Keep an up-to-date XML sitemap to tell crawlers which pages should be explored.
Example of a successful 404 page
A well-designed 404 page can turn a bad experience into an engagement opportunity. Here are a few essential elements for an effective 404 page:
1. A clear, human message: Instead of a plain "404 Not Found", use a friendly message such as: "Oops, this page seems to be missing."
2. An internal search engine: Let users easily search for what they are looking for directly from this page.
3. Links to popular pages: Add links to your main categories or popular articles.
4. An attractive design: Use an engaging image or animation to make the page less frustrating.
Example of a humorous design:
• An image of an "astronaut lost in space" with the text: "Looks like you're out of orbit! Head back home."
Impact on your site's reputation
404 errors can also affect how users perceive your site. If a visitor lands on several 404 errors while browsing your site, they may perceive it as neglected or unprofessional. This can affect user loyalty, especially for e-commerce sites.
Best practices to protect your reputation:
• Set up an alert so you are notified of 404 errors as soon as they occur.
• Carry out regular audits to maintain smooth, intuitive navigation.
How do you monitor and automate the handling of 404 errors?
For large-scale sites, monitoring 404 errors manually can become a challenge. Fortunately, several tools can help you automate this task:
1. Google Analytics:
• Set up custom alerts to track pages with a high bounce rate, often caused by 404 errors.
2. WordPress plugins:
• Plugins such as Redirection let you monitor 404s and create redirects automatically.
3. Monitoring tools:
• Platforms such as Ahrefs or SEMrush can detect broken links on your site and in your backlinks.
Creating a 302 vs 301 redirect: What's the difference?
When you set up a redirect to fix a 404 error, it is important to understand the difference between a 301 and a 302 redirect:
• 301 redirect (permanent): Used when the page has been moved or deleted permanently. It transfers the "link juice" to the new page.
• 302 redirect (temporary): Indicates that the redirect is temporary and that the original page may be restored.
Tip: Always use a 301 redirect to fix a 404 error, unless you know the redirect is temporary.
FAQ: Frequently asked questions about the HTTP 404 error
1. Does a 404 error affect my SEO?
Yes, especially if many internal or external links point to non-existent pages. This sends negative signals to search engines.
2. How do I detect 404 errors on my site?
Use tools such as Google Search Console or Screaming Frog to identify the affected pages.
3. Can I disable 404 errors on my site?
No, they are an integral part of the HTTP protocol. However, you can minimize their impact by setting up redirects or creating a custom 404 page.
Conclusion:
The HTTP 404 error may seem harmless, but its impact on the user experience, SEO and your site's credibility is significant. Poor handling of not-found pages can frustrate your visitors, increase your bounce rate and harm your ranking in search engines.
By following the best practices mentioned in this article — such as creating 301 redirects, setting up a custom 404 page and using tools to detect and fix broken links — you can not only avoid these errors but also improve the overall quality of your site.
To go further, be sure to regularly monitor your site's performance with tools such as Google Search Console, and invest in regular maintenance to prevent new errors from appearing.
To stop this error from happening again, follow the best practices mentioned and regularly monitor errors through Google Search Console. If you want to learn more about other HTTP errors, explore my articles on the 500, 403, 502, 503, 504, 429, 401, 400 and 410 errors for detailed solutions!
