SEO and duplicate content

Canonical Links

When posting content to multiple platforms at the same time (such as your website and Medium), it is important to make sure a single source of that content is the ultimate authority. Medium’s official tools for cross-posting (including the Migration tool, Import tool, and Wordpress plugin) add the source it is importing from as the canonical link automatically.

Search engines use canonical links to determine and prioritize the ultimate source of content, removing confusion when there are multiple copies of the same document in different locations. Sites that publish an over abundance of duplicate content without indicating a canonical link may be penalized in search engine rankings.

Medium’s publication and cross-posting pathways automatically add canonical links to protect your original content posted offsite. This means that Medium can only boost — not cannibalize — your SEO.

It is the responsibility of the web-masters and content developers for each individual site migrating, importing or cross-posting to Medium to make sure they follow search engine quality guidelines and best practices on their own sites. Medium will always do our best to give credit to your original source by use of a cross-domain canonical link.

Please note: if you are just copying and pasting content into a Medium post, Medium cannot determine the canonical URL. Whenever possible, use the official import tools or email us if you need corrections made.


How can I check if my Medium post has the proper canonical link?

After you’ve published your post, right click and choose “View page source”. Search for “canonical”, and the first result will show the link you imported from.

What happens if I transfer my domain to Medium?

When you import your posts to Medium using the official tools and then switch to a custom domain hosted by us, Medium automatically handles re-directs (see below), so old links will go correctly to the new content. There will be no loss in organic traffic for landing pages that transfer over to Medium, such as your homepage. It may take search engines like Google some time to correctly index each of your new pages (up to 3–4 weeks at most)

What are the restrictions on re-directs?

The custom domain you set up on Medium must be the same as your old one in order for automatic 301 re-directs to work. So if your old site was and your new Medium custom domain links to the same URL (ie,, then re-directs will automatically work. Re-directs will not work if your old site was and you want to change to another domain or a subdomain of your old site (ie,

How good is Medium’s SEO? Will it perform better than my own blog?

Medium is a vast publishing platform with many high authority authors publishing content on a frequent basis. It is linked to throughout the internet. This size and authority means that, for any given topic, its SEO is stronger than the vast majority of independent blogs. However, bloggers can use this strong SEO to their benefit. By using Medium’s official import tools, you can reap the benefits of high discoverability on Medium while still crediting all authority towards your own blog using Medium’s canonical URLs.


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