What is link velocity?
Link velocity is how fast a site or page gains new backlinks over time. A site that picks up 30 new referring domains in October has a link velocity of 30 referring domains a month. A page that earned 200 links in the week after a news story ran had a much higher velocity that week than in a normal one.
Link velocity is a label SEOs and backlink tools use, not a term Google uses. It is usually measured in referring domains rather than individual links, because a single sitewide link can add thousands of links from one site overnight without meaning much.
Link velocity is usually read together with the rate of lost links, since a site can gain 30 referring domains in a month and lose 25. The loss side is covered under link decay.
Does high link velocity cause a Google penalty?
No. A high link velocity does not by itself cause a Google penalty. Google's spam policies define link spam as "the practice of creating links to or from a site primarily for the purpose of manipulating search rankings" [1]. The definition is about why links were created, not how quickly they arrived. Search Insider found no Google document that names link velocity, link speed or a rate of link growth as a ranking factor or a spam signal.
The examples Google gives of link spam are all about how links were obtained: buying or selling links that pass ranking credit, excessive link exchanges, automated link building, and optimized anchor text in articles, guest posts and press releases on other sites [1]. A thousand links in a day from news sites covering a genuine story fit none of those. Ten bought links a month, spaced out carefully, fit several.
This is the most common misunderstanding about link velocity. Advice to "build links slowly so Google doesn't notice" treats the speed as the problem. Under Google's own policy, the problem is the buying, not the pace.
Why do people think link velocity triggers penalties?
People link velocity to penalties because the two often appear together. Sites that buy links in bulk tend to gain links quickly, and those sites are also the ones that get hit. The spike and the penalty share a cause, the link scheme, but the spike is not what Google is acting on.
Google's manual action for unnatural links describes "a pattern of unnatural, artificial, deceptive, or manipulative links pointing to your site" [2]. The words that matter are unnatural, artificial, deceptive and manipulative. A burst of links from low-quality sites with keyword-rich anchors is a pattern of that kind. A burst of links from publications writing about a company's research is not.
How does Google treat link velocity today?
Google has not said how, or whether, it uses the rate of link growth. What is known is how Google evaluates links in general:
- Google detects link spam "both through automated systems and, as needed, human review that can result in a manual action" [1].
- Since September 23, 2016, Penguin has run as part of Google's core algorithm in real time [3][4], so link patterns are assessed continuously rather than in occasional sweeps.
- When Penguin launched, Google's emphasis moved from the quantity of links to their quality [5].
None of this gives a speed limit. Any figure quoted as a "safe" number of new links per month is a guess. Google has never published one, and no outside study can measure a threshold Google has not admitted exists.
When did link velocity become an SEO concern?
Link velocity became a mainstream SEO worry after Google's Penguin update in April 2012, which punished sites that had built large numbers of manipulative links. The concern outlived the facts: Penguin targeted the links, and Google's later changes made link evaluation continuous rather than periodic.
2012: Penguin targets link schemes
Google launched Penguin on April 24, 2012, against link schemes and manipulative links, affecting about 3.1% of queries [3]. Sites that had bought or automated links in volume lost rankings, and many SEOs concluded that building links too fast was itself dangerous.
2012 to 2014: periodic refreshes
Penguin ran as a periodic update through versions in May 2012, October 2012, May 2013, October 2013 and October 2014 [3]. Each refresh was a separate, dated event rather than a continuous process.
2016: Penguin goes real time
On September 23, 2016, Penguin became part of Google's core algorithm and started running in real time [3][4]. Google announced the change in a post titled "Penguin is now part of our core algorithm" [4].
What is the difference between link velocity and link pickup rate?
Link velocity measures how many new links a site gains over time, while link pickup rate measures what share of a campaign's coverage or placements include a link. A digital PR campaign covered by 50 publications, 20 of which link, has a 40% pickup rate. Those 20 links, gained in two weeks, also produce a link velocity spike for that fortnight.
| Metric | Measures | Typical unit |
|---|---|---|
| Link velocity | Speed of new links or referring domains | Referring domains per month |
| Link pickup rate | Share of coverage that includes a link | Percent of articles |
| Link decay | Speed of losing existing links | Lost referring domains per month |
How do you measure link velocity?
To measure link velocity, take the number of new referring domains your site gained in each week or month from a backlink tool's history report, and plot it over time. Use referring domains, not total backlinks, so that one site adding a link to every page does not distort the chart.
Read the chart against your own history:
- Find the baseline. Most sites have a steady background rate from mentions, directories, citations and scrapers.
- Mark every spike. For each week well above the baseline, open the new referring domains from that period.
- Explain each spike. A product launch, a news story or a viral post explains a natural spike. If you cannot find any reason, look closer at the linking sites and anchors.
- Check the losses too. A high gain rate with an equally high loss rate often means links from short-lived pages or networks.
This check is what Search Insider recommends instead of watching a speed limit: the question is never "is this too fast?" but "do I know where these links came from?"
What should you do about a sudden spike in links?
If you earned the spike, do nothing. Links from real coverage are exactly what Google's systems are built to reward, and slowing down a successful campaign to look "natural" gives up links for no documented benefit.
If the spike came from links you or a vendor bought, the speed is not the issue to fix. The links themselves fit Google's description of link spam [1]. If Google has issued a manual action for unnatural links, its recommended steps are to remove the links where possible, use the Disavow links tool for those you cannot remove, and then request a review [2].
If the spike came from sites you have never heard of, such as scraped copies or spam directories, review them before acting. Most sites attract some low-quality links without doing anything wrong. See negative SEO and disavow file for when action makes sense.
When should you care about link velocity?
You should care about link velocity as a diagnostic, not a target. A steady or growing rate of new referring domains shows that a site keeps attracting attention, which Google's SEO Starter Guide links to discovery: most new pages Google finds are found through links [6]. A falling rate can signal that content has stopped earning citations.
Do not plan link building around a target velocity, and do not slow down genuine coverage. Plan around earning links that would survive a manual review, and let the speed be whatever that produces.