What Is Disavow?
Disavowing links is a process provided by Google that allows webmasters to tell Google's search algorithm to ignore certain backlinks when assessing a website's authority. It is carried out by creating a plain-text disavow file that lists specific URLs or entire domains you want Google to disregard, and then uploading that file through Google Search Console.
The disavow tool was introduced by Google in 2012 in response to the Penguin update, which began penalising sites with manipulative or spammy link profiles. It gave webmasters a way to signal which links had been bought, placed through link schemes, or built by black-hat SEO practitioners without their knowledge or consent.
The file format is straightforward. Individual URLs are listed one per line to disavow specific pages. To disavow an entire domain, you prefix the domain with "domain:" as in "domain:spamsite.com". Comment lines beginning with "#" can be added to document your reasoning. Google recommends disavowing at the domain level where possible, as this is more comprehensive and easier to maintain than listing individual page URLs.
It is important to understand that disavowing is an advanced tool. Google's algorithms are capable of ignoring most low-quality links on their own, and unnecessary use of the disavow tool can remove the positive contribution of legitimate links. Google's own guidance states it should only be used when you have been hit with a manual action for unnatural links, when you have built links that violate their guidelines, or when a competitor is actively running a negative SEO campaign against your site.
Disavow In Practice
A Cape Town retailer engaged an overseas SEO provider in 2022 who delivered a package of five hundred directory and article site links. Over the following months, the site experienced a steady ranking decline. An audit using Ahrefs revealed that the majority of these links came from known private blog networks with no real traffic and highly similar link profiles, pointing to multiple unrelated websites simultaneously.
The correct approach is to first attempt outreach to the linking sites requesting removal. For low-quality link farms and PBNs, this step rarely succeeds but is recommended as it demonstrates good faith to Google. The next step is to compile all confirmed problematic domains into a disavow file and submit it via Search Console. The site owner must then monitor Search Console's coverage and performance reports over the following weeks to observe any ranking recovery.
For South African businesses inheriting an existing website from a previous agency, it is worth running a full backlink audit before beginning any new SEO work. Inherited disavow files may be outdated or over-inclusive, and should be reviewed and updated as part of an initial technical off-page SEO audit.
FAQ
How long does it take for a disavow to take effect in Google?
Google typically processes a disavow file within a few weeks, but ranking recovery after a link-related penalty can take one to three months or longer depending on the severity. Google must recrawl disavowed domains before the file fully takes effect.
Can disavowing backlinks accidentally hurt my SEO?
Yes. Disavowing legitimate high-quality links by mistake will remove their positive ranking contribution. Always review your disavow file carefully before submitting and target only clearly spammy or penalised domains, ideally using domain-level disavows rather than individual URLs.