Auditing your website for design and security issues lets you build a sleek user experience that retains users. Standards like 301 redirect, GZIP compression, and more, are some elements worth checking.

However, doing all that by yourself can be time-consuming and unproductive. Thankfully, there are plenty of tools out there that can quickly scan and audit your website to show you what needs fixing. Here are the best website auditing tools you can use.

1. Nibbler

A section of Nibbler's health test result for a website

Nibbler uses one of the most efficient practices to scan your website. That's what makes it one of the best website auditing tools out there.

The web app features an interface that gives you a holistic and easy-to-read report of your audit. In addition to being free, Nibbler also offers an unlimited number of web crawls.

If you previously updated your website after running it through Nibbler, rescanning the same domain with its Retest option generates an updated report. Unlike some other crawlers, Nibbler runs through your website as a bot rather than a browser, so it doesn't affect connected analytic tools, like Google analytics.

Because it's a bot, you can choose whether you'd like to disable Nibbler from crawling your site or not via your robot.txt file.

Related: How to Correctly Set Up Robots.txt for Your Site

Reporting issues comprehensively, Nibbler tests website parameters like accessibility, mobile responsiveness, and technology usage, among others. When you run your URL through Nibbler, it divides your web audit report into sections so you can see what needs fixing and what's perfect already.

2. Sitechecker

Sitechecker audit page displaying a website audit result

Featuring a source code crawler, the unique feature of Sitechecker is that it lets you view the line in your code where you need to make recommended changes. That feature simplifies a lot of things and lets you effortlessly fix bugs in no time.

To see what needs changing, click How to fix next to each issue, and then select View all affected pages. Then, hit Issue in code to view the faulty line in your code.

The tool also offers a Chrome extension that lets you perform a one-click on-page analysis on the website you wish to audit. Like Nibbler, it points out issues and recommendations explicitly.

Related: How to Use Chrome DevTools to Troubleshoot Website Issues

It also categorizes issues based on their severity, designating them as either Critical, Warnings, or Notices. Like Nibbler, if you feel the need to analyze your site again after updating your website, it has a recrawl option for updating the audit in real-time.

In addition to viewing real-time reports, you can also download your website audit report as a PDF. You can start with its free plan. However, to get the most of it, Sitechecker comes with more full-featured plans ranging from $19 to $69.

3. eRanker

eRanker's report interface with some recommendations

In addition to rating your website on a scale of 100, eRanker uses standard grade levels, ranging from A to F, to grade your website. Although it can be slow, eRanker reports the faults on your website in full detail. It's one of the best tools you can use to carry out a more comprehensive website audit.

In case you need to compare performance, the tool features a dashboard for all of your reports. This lets you keep track of previous website checks. You can also download each report as a PDF from the dashboard, or directly from the report page.

For caching reasons, it also lets you rescan your website after an update. You can even use the fixed top navigation bar to switch between different sections of the generated result if you like.

Although eRanker's free plan places a limit on the number of domains you can check, its paid options, starting at $90, offer an unlimited number of scans with other premium features.

4. HubSpot Tools

Hubspot Tools website checker

HubSpot Tools gives you a concise breakdown of how your website conforms with expected standards. It's pretty fast, and tells you straight away whether your website is good or not. Plus, its language support lets you view your report in six different languages.

HubSpot Tools measures parameters like speed, performance, mobile responsiveness, and security, among others. Unlike Nibbler, the tool subjects your website to less scrutiny. But it still does an excellent job of recommending some necessary fixes for your website.

You can access its recommendations by scrolling to the bottom of the page. In addition to that, its ranking system places your website's score on a scale of up to 100.

Using HubSpot Tools to check your website is free. However, using the tool requires that you input your email address. And like other website checkers, HubSpot also requires the URL of the website you wish to check.

5. PowerMapper

Powermapper diagnostic tool

PowerMapper comes in handy when you need to quickly check your website's issues without necessarily going into full detail. Its free version checks only 10 pages and images, and reports on only a handful of parameters. But it's worth using, as it still finds some major issues.

While its free trial has limitations, the paid version offers more page checks, comprehensive reporting, general design support, and more. PowerMapper's reports tell you exactly what's broken, such as the number of pages with quality issues, accessibility issues, and more.

6. Web.com

Web.com results

Offering one of the best user interfaces, Web.com gives a brief analysis of your website. Like other website auditors on the list, Web.com rates your website based on a scale of 100.

Comparing your website with accepted standards, this tool checks for errors in mobile and desktop designs. However, one of the shortcomings of Web.com is its inability to give comprehensive feedback and recommendations for each parameter it checks. It doesn't report issues based on figures.

So, you can't determine their level of impact on your website. Its mode of reporting can also be vague, and sometimes, it's unable to determine some parameters at all.

Its audits aren't as comprehensive as those you get from the other tools on the list. But if you prefer to opt for lesser detail, it's still a great tool you can use.

Simplify the Process of Auditing Your Website

Even if you have a knack for finding website issues, you can't be perfect at finding everything that needs fixing.

The tools listed in this article are efficient fault-finders that simplify website auditing tasks for you. Using them gives you a glimpse at some bad practices you might have, and how you can go about fixing them.