When to send it
Email the link within a few hours of the webinar ending, ideally in the same message that shares the recording. People who attended live answer while the session is fresh, and those who missed it can answer after catching up. If your webinar tool lets you post a link in the chat, drop it there in the final minute too.
Why these questions
The first question is an agreement statement: the webinar was worth the time spent on it. Time is the real price of a free webinar, so this is a more honest measure than whether people enjoyed it.
The second asks how much they watched: all of it live, part of it live, or the recording. If someone left part-way, a follow-up asks what made them leave. Some drop-off is normal, but if several people name the same reason, such as a long introduction or a pitch that came too early, you know what to cut.
The depth question asks whether the content was too basic, about right or too advanced. Webinars often draw a wider audience than planned, and these answers help you decide whether to split future sessions by level.
The last question asks what the next webinar should cover. It's open text rather than a list, because the topics people suggest in their own words are often better than the ones you'd think to offer.
Why there's no coupon
Webinar audiences are usually a mix of customers and people still getting to know you. A coupon here would pull in answers from people chasing the discount and blur an honest read on the content. If the webinar is part of a sales path, make your offer separately, at the end of the session or in the follow-up email, and keep this survey about the webinar itself.
What to do with the answers
Look at the "left early" answers alongside your webinar tool's attendance report to find the moment people drifted off. Rank the suggested topics by how often they come up and plan the next two sessions from the top of the list. If one topic keeps returning, it may deserve a longer paid session: the workshop feedback template suits that format. For in-person events, use event attendee feedback, and to understand who is turning up in the first place, try early customer problem discovery.