Free domain authority checker for one domain or 50 at once

A domain authority checker tells you how strong a website is likely to be in search, on a simple 0–100 scale, based on its backlink profile. It is one of the first numbers SEOs reach for when they size up a site — their own, a competitor’s, or a potential link partner’s. This free domain authority checker works as both a single-domain DA checker and a bulk DA checker, so you can check one site or score fifty at once. Below we explain exactly what Domain Authority is, how it differs from Page Authority and Domain Rating, what a good score looks like, how to use a website authority checker for link prospecting at scale, and — importantly — the honest limits of any third-party authority metric.

What is Domain Authority (DA)?

Domain Authority is a search-engine-ranking score that predicts how well a whole website is likely to rank in search results. The metric was popularised by Moz, which scores domains from 1 to 100, where higher is stronger. It is calculated primarily from the quality and quantity of a site’s backlinks — the other websites that link to it — because in search, links still function as votes of confidence. A domain that many trustworthy, relevant sites link to tends to rank better than one almost nobody links to, and DA tries to capture that relationship in a single comparable figure.

Two properties of DA matter for how you read it. First, it is predictive and comparative, not absolute: it estimates ranking potential relative to other sites, rather than measuring an intrinsic quality. Second, it runs on a logarithmic scale. That means the effort required to grow your score increases sharply as it climbs. Taking a site from a DA of 10 to 20 is comparatively quick; pushing from 70 to 80 demands an enormous, sustained link profile. Understanding the log scale stops you from panicking about slow movement at the top end and from over-celebrating easy early gains.

The essential caveat, which we repeat throughout this page because it matters: Domain Authority is a third-party estimate, not a metric Google uses or endorses. Google has repeatedly said it has no single “domain authority” score in its ranking systems. DA, Domain Rating and similar scores are useful proxies invented by SEO tool vendors to model something Google keeps private. They correlate with ranking ability, but they do not cause rankings, and chasing the number for its own sake is a mistake.

How this domain authority checker works

This tool is powered by OpenPageRank, a free service that publishes a PageRank-style authority value for millions of domains based on the open web’s link graph. OpenPageRank reports a score from 0 to 10 — a modern echo of Google’s original PageRank, which also used a 0–10 toolbar scale before Google retired it publicly. Because a 0–10 figure is unfamiliar to most people who think in DA terms, our open page rank checker also scales that value to a familiar 0–100 authority score, so it reads just like a DA number.

When you check a domain, the request goes to our server, which holds the OpenPageRank API key, validates every domain you submit, and returns three things per site: the 0–100 authority score (labelled DA), the raw OpenPageRank (0–10), and the domain’s global rank — roughly where it sits among all ranked domains worldwide. Keeping the key server-side means you never have to register for an API yourself, and it lets us cache results and rate-limit fairly so the tool stays fast and free for everyone.

To be completely transparent: this is an OpenPageRank-powered authority estimate, not Moz’s proprietary Domain Authority. “Domain Authority” and “DA” have become generic shorthand for domain-level link authority across the industry, and that is the sense in which we use them. The two are conceptually very close — both are link-based, both run on a 0–100 feel, both are predictive proxies — but they come from different data sets and will not match digit for digit. If you need Moz’s exact trademarked DA, check it inside a Moz product; for a fast, free, honest authority read, this free DA checker does the job.

DA vs PA vs DR: how the authority metrics differ

The acronyms trip people up constantly, and a good da pa checker should make the distinctions clear. All three are 0–100 link-based authority scores, but they measure different things and come from different companies:

• DA — Domain Authority (Moz): whole-domain ranking strength. This is the site-wide number people mean when they say “what’s your DA?”
• PA — Page Authority (Moz): the same predictive idea applied to a single page rather than the whole site. A powerful individual article can carry a high PA even on a domain with a modest DA, which is why a pa da checker view is useful when you care about one URL’s strength.
• DR — Domain Rating (Ahrefs): Ahrefs’ domain-level metric, weighted heavily toward the number and strength of referring domains. It answers the same question as DA but with a different data set and formula.

The practical rule is simple: only ever compare like with like. Comparing your Moz DA of 40 against a competitor’s Ahrefs DR of 55 tells you nothing, because they are measured on different graphs. Pick one metric for a given comparison and hold it constant across every site. If you want the Ahrefs angle, our sister tool, the Domain Rating checker, reports DR the same way this tool reports DA, so you can view both signals side by side and build a more confident picture.

What is a good Domain Authority score?

There is no universal pass mark, because “good” depends entirely on your niche and your competitors. That said, the authority bands this tool uses are a reliable starting frame for interpreting any score:

The number that actually matters is relative: can you out-rank the specific sites competing for your target keywords? A DA of 30 can dominate a low-competition local or niche market where everyone else sits at 20, while a DA of 55 can struggle in a crowded space packed with DA-70 publishers. Before you set an authority goal, check your top-ranking competitors for the keywords you want, note their scores, and aim to match or beat the realistic ones. That turns an abstract number into a concrete, winnable target.

Using a bulk DA checker for link prospecting

The single biggest time-saver this tool offers is the bulk domain authority checker. Anyone doing link building, guest posting, digital PR or outreach ends up with long lists of candidate sites, and checking each one by hand is painfully slow. Switch to Bulk mode, paste up to 50 domains — one per line — and score the entire list in a single pass. The results land in a sortable table showing DA, OpenPageRank and global rank for every domain, with a one-click Copy results (CSV) button to move everything into a spreadsheet.

A typical workflow looks like this:

• Gather prospects. Export a list of potential guest-post or link sites from your research, a marketplace, or a competitor’s backlink profile.
• Score in bulk. Paste them into the bulk DA checker and run one check. Sort the table by DA to float the strongest domains to the top.
• Shortlist. Keep the sites that clear your minimum authority threshold and drop the obviously weak ones — but do not stop at the number.
• Qualify properly. Authority is a filter, not a verdict. Before you reach out, confirm the site is topically relevant, has real traffic and genuine content, and is not a link farm propped up by spam.

This “score then qualify” sequence is exactly how experienced link builders avoid wasting outreach on sites that look strong on paper but add no real value. A high authority score on a thin, off-topic, or manipulated domain is a trap, not a prize.

How to increase your Domain Authority

Because authority scores are driven overwhelmingly by backlinks, the way to raise them is to earn more high-quality, relevant links over time. There is no shortcut and no button to press — it is the accumulated result of doing the fundamentals well, month after month:

• Publish genuinely link-worthy content. Original research, data, tools, definitive guides and strong opinions earn citations naturally. Thin, me-too content earns nothing.
• Earn editorial links. Digital PR, expert contributions, guest articles on relevant publications and unlinked-mention reclamation all build the kind of editorially given links that move authority honestly.
• Prioritise relevance and quality over volume. A handful of links from respected, on-topic sites outweighs hundreds from irrelevant or low-quality domains — and buying spammy links in bulk can actively hurt you.
• Keep your profile clean. Audit for toxic or spammy links, disavow where genuinely warranted, and keep your internal linking logical so authority flows to your important pages.
• Be patient and consistent. On a logarithmic scale, meaningful movement takes months. Steady, relevant link acquisition is what compounds.

If earning those links in-house is a stretch, this is precisely where a managed service earns its keep. Serpbays’ managed link building focuses on high-quality, editorially placed links from relevant sites — the kind that lift authority the right way and, more importantly, support real ranking gains. You can also explore the options on the buy backlinks page to see how a vetted, quality-first approach differs from the bulk-link schemes that put domains at risk.

The honest limits of any authority metric

It would be easy to oversell a website authority checker, so here is the straight talk. Authority scores — whether DA, DR, or the OpenPageRank-based score this tool reports — are third-party estimates, not Google metrics. They are modelled approximations of ranking potential, and they share a few important limitations you should keep in mind:

• They are not ranking factors. Google does not read your DA and rank you accordingly. A high score correlates with ranking ability; it does not cause it.
• They can be gamed, briefly. Because the scores lean on link counts, manipulated link schemes can inflate a number temporarily — which is exactly why you must qualify a site’s relevance and real traffic, not just trust its score.
• They lag and they differ. Each tool updates on its own schedule and uses its own crawl of the web, so scores drift over time and rarely agree across vendors.
• They say nothing about relevance or intent. A DA-80 site in an unrelated niche is a worse link prospect than a DA-35 site that is perfectly on-topic for your audience.

None of this makes authority scores useless — far from it. Used as a fast comparative filter and a sanity check, they are genuinely valuable. The mistake is treating the number as the goal rather than as one input. Pair the DA figure here with the Domain Rating signal, a look at real traffic and relevance, and your own judgement, and you will make far better decisions than a score alone could ever justify.

DA vs real rankings: keep the goal in sight

It is worth ending on the difference between an authority score and the thing you actually want: traffic and rankings for terms that matter to your business. DA is a means, not an end. Plenty of sites with modest authority out-rank higher-authority competitors because they have better-matched content, a sharper understanding of search intent, cleaner technical SEO, and links that are more relevant even if fewer in number.

So use this check domain authority workflow the way the best SEOs do: as a quick, honest gauge to compare domains, filter prospect lists, and track the broad direction of your own link-building efforts — while keeping your eyes fixed on rankings, organic traffic and conversions as the real scoreboard. Run a single domain to see where it stands, switch to bulk to vet a whole list, export the CSV, and feed those decisions into a link strategy built on relevance and quality. That is how an authority number stops being vanity and starts driving results. Check any domain in the tool above to get started.