Straight answer: the correct spelling is webinar, one word, no hyphen, no capital letter needed unless it starts a sentence or sits in a title. It comes from “web” plus “seminar,” and every other version you have seen (webinair, web-inar, webbinar) is wrong. I have watched a client lose momentum on a launch because of exactly this, so I am not being precious about it.
The correct spelling, once and for all
Webinar. W-E-B-I-N-A-R. One word. No hyphen. It is not “webinair” (that is not even a real English construction, it just sounds French), it is not “web-inar,” and it is not “webbinar” with a double B, even though the double B version somehow shows up in emails from people who should know better.
The word is a portmanteau, web plus seminar, coined in the mid-1990s as online meeting software started to spread. Merriam-Webster and the Oxford English Dictionary both list it the same way: one word, all lowercase in normal use. There is no official capital, no official abbreviation, and no acceptable shortened form other than “webinar” itself, though plenty of Americans in my inbox insist on “web seminar” written out in full, which is also fine, just old-fashioned.
Why so many people get it wrong
I have seen every one of these in the wild, usually on landing pages, event invites, and LinkedIn posts from people who are otherwise sharp marketers:
- Webinair, the most common mistake, almost always from someone typing fast and letting autocorrect or muscle memory finish the word wrong
- Web-inar, hyphenated because it looks like it should split at the join between “web” and “seminar”
- Webbinar, double B, usually a typo that spellcheck misses because it still reads as a plausible word
- Webinare, an extra E on the end, common among non-native English speakers because it mirrors German and Scandinavian spelling patterns
- Weeb-inar, which I have only seen once, on a printed flyer, and I still think about it
- Webinar with a capital W mid-sentence, which is not technically wrong but reads like a brand name and looks odd
Autocorrect is part of the problem. Older versions of Microsoft Word did not recognise “webinar” as a word at all and would flag it, pushing people toward “webinair” or “seminar” as the suggested fix. That has mostly been resolved now, but the muscle memory from years of red squiggly lines has stuck around.
A real example that cost real money
A coaching client of mine, running a small consultancy in Kent, built a Facebook ad campaign around a lead generation event and spelled it “Webinair” across the ad copy, the landing page headline, and the confirmation email. It sat live for eleven days before anyone noticed. The ad still got clicks, because the image and the offer did the heavy lifting, but her cost per registration was 40% higher than the campaign she ran the following month with the same audience, same budget, same offer, just spelled correctly. That is not proof the spelling alone caused the gap, other things changed too, but it rattled her enough that she now has someone read every piece of copy out loud before it goes live. I would recommend that habit to anyone running paid traffic, spelling mistakes are one of the cheapest things to catch and one of the most annoying to explain to a client afterward.
Does the misspelling hurt you?
Here is the bit most articles on this topic will not tell you straight: Google is far more forgiving of “webinair” and “webbinar” than people assume. Search engines correct for common misspellings constantly, and if someone types “webinair” into Google, they still land on pages about webinars within a fraction of a second, no harm done to the searcher. So if your worry is pure SEO ranking, a single typo on one internal page is not going to sink you.
Where it does matter is trust and polish. A misspelling in a subject line, on a paid ad, or on the actual registration button is a small signal that reads as “we did not check this,” and for anyone selling expertise or authority, that signal is expensive. This is the same logic I use when I talk about why engagement numbers alone do not equal ROI. A typo will not tank your reach, but it chips away at the credibility that turns a click into a paying client, and credibility is the whole game once someone is deciding whether to trust you with their time or their money.
Where the spelling matters most
Not every instance carries the same weight. Rank these by how much scrutiny they get:
- The registration page headline, the first thing a prospect reads and screenshots to a colleague
- The confirmation and reminder emails, which people open two or three times before the event
- Paid ad copy, where a typo sits in front of thousands of cold eyes with no context to soften it
- Cold outreach inviting people to attend, where a spelling slip can undercut an otherwise strong pitch, something I cover in more detail in my piece on getting better responses from cold email
- Social promotion, including when you tag a Facebook group to spread the word, since group admins notice sloppy copy fast and are less likely to approve or share it
- Internal Slack messages and calendar invites, where nobody cares and you should not waste a second worrying about it
That last point matters. I have seen founders spend twenty minutes debating spelling in a team Slack thread when the real problem with their webinar was a weak hook in the first ninety seconds. Fix the spelling once, in your templates, and then stop thinking about it.
A five-minute fix so this never happens again
Here is exactly what I tell clients to do, and it takes less time than reading this section:
- Open your email tool, your landing page builder, and your ad manager, and search each one for “webinair,” “web-inar,” and “webbinar”
- Fix every instance you find, then save the corrected version as your master template
- Add “webinar” as a custom dictionary entry in Word, Google Docs, and your CRM if any of them still flag it
- Get one other person to read your registration page and confirmation email out loud before anything goes live, out loud catches typos silent reading misses
- If you run webinars regularly enough to record and repurpose them, check your transcripts too, since auto-generated captions frequently render it as “web in R” or “web an R,” and if you are relying on outside help for that work it is worth knowing what people pay for transcription work before you hand it off
Related words people also get wrong
While we are here, a few cousins worth clearing up:
- Seminar, one word, refers to the in-person original that webinar borrowed its ending from
- Workshop, always two words squashed into one, never “work shop”
- Livestream, one word as a noun, though “live stream” as two words is also widely accepted when used as an adjective plus noun
- Podcast, one word, no hyphen, despite being newer than webinar and equally clunky sounding when you say it slowly
None of these are difficult once you have seen the correct version written down a few times. The brain just needs one clean example to anchor to, which is the same principle good brands use everywhere, consistent, repeated, correct usage until it looks obviously right and anything else looks obviously wrong. It is worth noticing how consistently companies like Miro handle their own brand language across every touchpoint, because that consistency is doing quiet work on trust long before anyone reads the actual content.
The bit worth admitting
I will say the uncomfortable part plainly, since most people writing about this topic will not. Nobody has ever failed to book a call with me because I misspelled a word in a follow-up email. What tanks webinars is a boring title, a pitch that starts too early, and a host who reads slides instead of talking to the room. Spelling “webinar” correctly will not save a bad webinar, and getting it wrong will not sink a good one. Fix it because it takes five minutes and removes one small doubt from a prospect’s mind, then spend your remaining energy on the content, the hook, and the offer, because that is where webinars win or lose.
Frequently asked questions
Is it one word or two, webinar or web inar?
It is one word, webinar, with no space and no hyphen. “Web inar” or “web-inar” are both incorrect and will look like a typo to anyone who reads your copy carefully.
Do you capitalise webinar in a sentence?
No, treat it like any other common noun. Only capitalise the W if it starts a sentence, appears in a title using title case, or is part of a proper name like “Webinar Wednesday” that you have branded deliberately.
Does misspelling webinar hurt my SEO?
Barely, if at all. Google corrects for common misspellings automatically, so a single typo on one page will not meaningfully change your rankings. It matters far more for trust on registration pages and ads than it does for search visibility.
What is the most common misspelling of webinar?
Webinair is by far the most common, followed by web-inar with a hyphen and webbinar with a double B. All three are wrong, and all three are easy to fix once you know to check for them.
