Good news - you can technically embed a Sketchfab 3D model on any HTML website! You can also embed Private and Password-protected models that don't appear publicly on Sketchfab.
Just click the Embed button on the model's page, under the viewer, to find the iframe HTML.
To embed the 3D model viewer on another site, copy the code and paste it into your website's HTML code. This will work almost anywhere on the web; if the HTML iframe tag is supported, you can embed a Sketchfab model.
If your Account Type is set to Individual, you cannot embed models on a commercial or company website.
If you're unsure about your Account Type choice, check out Choosing the right Account Type.
Each Sketchfab membership plan offers different embed options.
Firstly, you can click within the Format or Size windows to adjust the embed viewer code.
Additional options can be unlocked by clicking the Upgrade to Unlock link and upgrading your Sketchfab plan. For details on Sketchfab plans at a glance, and how the embedded viewer looks for each, you can explore them here: Pro, Premium, or Business.
In addition to the differences between the Pro and Premium embedded viewers (pictured below), the Premium plan allows Sketchfab users to hide viewer controls and information too.
If you'd like to remove the link back to the model page when a user clicks the Sketchfab logo in the lower-left corner of the Sketchfab viewer, you'll need to upgrade to the Business plan.
Basic / Pro
Beyond the options available by clicking Embed on the model page, you can edit the embedded viewer using parameters in the model URL.
For example, if you wanted to hide the user interface elements and make your model start and spin automatically, your iframe's src URL could look like this: