Do I need my tracking pixel on the sponsor to track keywords?

[pood]

My affiliate sponsor is allowing me to add a tracking pixel (Piwik) on their registration forms.

Some of my other sponsors don't allow this, but allow redirection to a thank you page.

Could I still track converting keywords (organic) without adding the tracking pixel on the affiliate sponsor landing pages?

[makemetop]

How are you currently tracking converting keywords?

Normally a conversion is tracked by the completion of an event which is why the "thank you" page has the code (or the conversion can be picked up by the redirect to a "thank you" page depending on the anlaytics tools used).

Alternatively, if a conversion is merely a click-through to an affiliate landing page - no tracking code need be on that page - you could use a javascript (on click) function (for example).

The simple answer to your question though is you need to have a tracking code or tracking call of some kind on an event completion to confirm a conversion for your keywords.