10 Free Domain Authority (DA) Checker Tools    

If you want to know how strong your website looks to search engines, start by checking DA. A domain authority checker gives you a score from 1 to 100. That number, in broad strokes, tells you whether your site is worth linking to or linking from.

Whether you’re new to SEO or deep into link prospecting, a free domain authority checker gets you a fast read on a site’s strength. This guide covers 10 tools worth using, how to read what they give you, and what to actually do about a low score.

Quick Comparison Table

What Is Domain Authority?

Domain Authority is a metric Moz built to estimate how likely a site is to rank in search results. Scores run from 1 to 100, and the calculation leans heavily on backlink quality and volume.

Google does not use Moz’s DA score. That’s worth repeating clearly, because a lot of content blurs this. What DA tells you is that sites with strong backlink profiles tend to outrank weaker ones.  And that correlation is real, even if DA itself isn’t a direct input into Google’s algorithm.

What is a Good Domain Authority Score?

Context matters here. A DA of 30 in a low-competition niche can outperform a DA 60 site in a crowded one. The score is a benchmark, not a guarantee.

How Does a Domain Authority Checker Work?

Each tool crawls the web, collects backlink data, and runs its own formula over what it finds. The process, roughly:

• Crawlers map which sites link to your domain, and how strong those sites are
• Unique linking domains get counted separately. 100 links from one site count less than links from 100 different sites
• The platform applies its proprietary scoring model and outputs a number

The measuring model is different for each tool. So, when you switch DA checker tools mid-campaign, the data becomes meaningless.

Factors That Affect Domain Authority

The DA score is downstream of a few well-understood factors. Some are in your control, some aren’t.

• Backlink Quality — One link from a trusted, relevant site outweighs dozens from low-quality directories. This is the biggest lever.
• Number of Referring Domains — Unique domains matter more than raw link count. Diversity signals broader authority.
• Internal Linking Structure — A clean internal architecture distributes page authority (PA) across your site, which supports overall DA.
• Content Quality — Strong content attracts natural backlinks. Thin or duplicate content rarely earns them.
• Spam Score — A backlink profile full of toxic links will hurt your score. Moz flags this directly with a Spam Score metric.
• Domain Age — Older domains with clean histories tend to accumulate authority over time, though age by itself means very little.
• Technical SEO — Site speed, HTTPS, mobile-friendliness, and crawlability all factor into how reliable your domain looks.

Competitor Activity — DA is relative. If your competitors build stronger links, your score can drop even if your own profile hasn’t changed.

How to Increase Domain Authority? 

There’s no shortcut here. DA growth is slow, and anything that looks like a fast win usually backfires.

Build High-Quality Backlinks

• Start guest posting on authoritative and niche-relevant sites.
• Develop link-worthy assets like original research or practical tools.
• Use a domain authority check tool. Identify strong sites worth approaching for outreach.
• Avoid paid links from low-DA sources. There’s a penalty risk that outweighs the short-term score bump.

Improve Your Content Strategy

• Publish in-depth articles that address real search intent.
• Refresh older posts regularly. Outdated content loses links over time.
• Weave target terms like DA PA checker and domain authority checker naturally, not forcefully.

Fix Technical SEO Issues

• Page speed matters on both mobile and desktop. Slow sites get crawled less efficiently and send poor user signals. 
• HTTPS is non-negotiable at this point. Clean up broken links.
• Submit a fresh sitemap to Google Search Console. Also, check the crawl coverage report while you’re in there.

Strengthen Internal Linking

• Connect new pages to older, established pages that already carry authority.
• Write descriptive anchor text; generic phrases like “click here” waste anchor equity.
• Build topic silos around your core subjects so authority flows logically.

Remove Toxic Backlinks

• Run periodic domain authority checks to audit your backlink profile.
• Use Google’s Disavow Tool for harmful links you can’t remove manually.
• Track new and lost links monthly — losing strong links drops your DA faster than most things.

Why Is Checking Domain Authority Important?

Checking your Domain Authority gives you a simple way to measure your site’s strength in SEO. It helps you track growth and compare yourself with competitors.

1. Compare with competitors

Checking domain authority helps you see how your site stacks up against others in your niche. If your score is higher, you can outrank them. If it is lower, you need better links and content.

2. Track SEO progress

Domain Authority makes it easier to measure the impact of your SEO work. For example – if you run a link-building campaign and see your DA move from 20 to 35, it shows your efforts are paying off.

3. Pick the right keywords

It is very hard to rank for a keyword if the top results all have much higher DA than you. But if your score is close to or higher than theirs, you can compete. This helps you focus on keywords that give you a real chance.

4. Spot drops early

If your DA suddenly drops, it may signal issues like losing important backlinks or gaining spammy ones. A quick check alerts you before it affects traffic. 

5. Plan smarter link building

Domain Authority checkers also highlight the quality of sites linking to you. This helps you target better sites for outreach and avoid wasting time on low-value links.

DA vs PA: Domain Authority vs Page Authority

A page can carry high PA even when the domain’s DA is low. If that page has collected strong individual links. When you check DA PA together, you get a fuller picture than either metric alone. Use a free DA and PA checker to track both, especially when evaluating link prospects.

10 Best Free Domain Authority Checker Tools

There are many tools that help you calculate domain authority. Here are some of the best paid and free domain authority checkers you can try using.

1. Moz — The Original Domain Authority Checker

Moz invented the DA metric, and the tool remains the baseline that most SEOs reference. So, Moz DA Checker is actually the original tool you can use. It gives you a DA score between 0 and 100 – and shows you how strong your site looks in search engines.

• Shows DA, Spam Score, and linking root domain count in a clean interface
• The Moz free domain authority checker (Moz Link Explorer) offers limited monthly checks without a paid account
• Pro plans start at $49/month for deeper backlink data and keyword tracking
• Useful for anyone who wants the DA scored by the company that defined it

2. Ahrefs — Best for Backlink-Focused Authority Checking

Ahrefs uses Domain Rating (DR) instead of DA. Different name, same idea — and the database backing it is one of the largest available.

• Free website authority checker shows DR, total backlinks, and referring domains immediately.
• Backlink data updates daily, which makes it reliable for monitoring changes.
• Paid plans ($129+/month) add keyword ranking, traffic estimates, and competitor gap analysis. 
• Preferred by agencies doing serious link acquisition work

3. SEMrush — Authority Score with Traffic & Spam Signals

SEMrush folds organic traffic and spam signals into its Authority Score calculation, which makes it a slightly different read than pure backlink metrics.

• Authority Score factors in backlink strength, organic traffic, and spam detection simultaneously
• The free version allows limited domain overviews. It’s enough to check the domain authority for quick comparisons. 
• Score updates more frequently than some competitors, which is useful for tracking momentum.
• Paid plans from $129.95/month unlock bulk analysis and full competitor intelligence.

4. Majestic — Trust Flow and Citation Flow Checker

Majestic built its own metrics: Trust Flow (TF) measures link quality, Citation Flow (CF) measures volume. The two together tell a more complete story than a single score.

• Trust Flow is particularly useful for identifying whether links come from credible sources.
• Topical Trust Flow breaks down which subjects your domain has accumulated authority in
• Free plan has limited checks; paid plans from $49.99/month support bulk prospecting.
• Experienced link builders rely on it heavily for qualifying outreach targets.

5. Website SEO Checker — Simple Free DA Checker

A no-frills tool that gets the job done fast. No account, no setup, no waiting.

• Displays DA, PA, and spam score in a clean, readable layout
• No registration required. Check website domain authority in seconds
• Supports bulk domain checks for faster SEO audits
• Fully free, no daily limits.Practical for quick evaluations

6. SmallSEOTools — Bulk DA PA Checker Free

SmallSEOTools handles bulk checks well. Paste up to 10 URLs and get DA and PA back in one shot.

• Checks up to 10 URLs simultaneously in a single DA PA checker free query
• Returns DA, PA, and Mozilla rank for each domain entered
• No account or payment needed; unlimited checks with no daily cap
• Straightforward enough for beginners but efficient enough for professionals

7. DA PA Checker — Dedicated Free DA and PA Tool

This tool exists specifically to check DA PA together, without the noise of an all-in-one platform.

• Data refreshes regularly, so scores don’t go stale
• Submit multiple URLs at once and get DA and PA side by side
• Moz-based DA and PA scores with spam score indicators included
• No registration required. Instant results for any domain

8. Ubersuggest — Beginner-Friendly Domain Score Checker

Neil Patel’s tool pairs a Domain Score with keyword data and traffic estimates. For someone new to SEO, having those in one place is genuinely useful.

• Domain Score appears alongside organic traffic, backlink count, and top keywords.
• The free plan allows 3 searches per day. That’s workable for occasional domain authority checks.
• Suggests SEO actions alongside the score, which helps beginners understand what to do next
• Paid plans from $12/month, one of the more affordable paid options in this category

9. SE Ranking — Domain Trust Score for Agencies

SE Ranking suits teams managing multiple client sites. The Domain Trust metric tracks authority separately from Page Trust, and the platform was built with reporting in mind.

• Domain Trust and Page Trust scores based on backlink quality and volume
• Includes backlink checker, competitor research, and rank tracking in one environment
• Trial available; paid plans from $55/month with white-label reporting support
• Worth it for agencies that need to show DA progress to clients on a regular basis

10. Prepostseo — Free Bulk Domain Authority Checker

It’s a free DA PA checker tool. Prepostseo keeps it simple: paste domains, get scores, no account needed.

• Check up to 10 domains at once with no daily limit and no login
• Returns DA, PA, spam score, and backlink count per domain in a single report
• One of the more complete free DA PA checker tools for bulk prospecting
• Fast, reliable, and straightforward — built for people screening long lists of link targets

How to Check Domain Authority (Step-by-Step)?

No complicated process required:

1. Open any free domain authority checker from the list above
2. Paste the domain URL into the search field
3. Hit the check or analyze button — results appear within seconds
4. Review the DA score, PA score, backlink count, and spam score
5. Compare against competitor domains to benchmark where you stand

For bulk prospecting, SmallSEOTools or Prepostseo lets you check DA and PA for multiple domains in one submission.

Conclusion

A solid DA PA checker is worth keeping in your workflow permanently. Whether you’re vetting link prospects, tracking your own site’s progress, or sizing up competitors, a free domain authority checker gives you the data to make faster, better-informed decisions.

The tools here range from Moz’s industry-standard DA scoring to bulk-focused free options like Prepostseo. Start with what’s free. Understand your scores in context. Then work consistently on the things that actually move DA like quality backlinks, strong content, and clean technical SEO. The score follows the work.

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Also read:

• 7 Best Backlink Monitoring Tools to Track Backlinks
• Top 10 Guest Post Marketplaces to Buy Quality Backlinks
• 12 Best Link Building Platforms