Trailers are some of the most watched videos online. A big franchise trailer can become a global event within hours, and for a lot of people it's the main way they decide what to watch. But a trailer is marketing, and not all marketing is built the same way. Studios release a carefully planned sequence of teasers, trailers, spots and clips, each with a specific job. Know which is which, and you get the information you want without the spoilers you don't.
The main types of promotional video
Teaser
A teaser is usually the first footage released, often many months before release. Teasers tend to be short and focus on mood, a striking image, a piece of music or a single line of dialogue. They are designed to announce the film and build curiosity rather than explain the story. Some teasers contain very little footage from the finished film.
Official trailer
The main trailer, typically a couple of minutes long, sets out the premise, introduces the main characters and shows the scale of the film. Many big releases get more than one: a first trailer, then a "final" or "main" trailer closer to release. Later trailers usually reveal more of the plot, which is why some fans prefer to stop after the first.
TV spots and short cuts
TV spots are short edits, often 15 to 60 seconds, made for television and online ads. Because they are cut to grab attention quickly, they may use moments from late in the film. Spoiler-sensitive viewers often treat them with caution.
Clips and featurettes
Clips are complete short scenes, usually from early in the film. Featurettes are behind-the-scenes pieces with interviews from the cast and filmmakers about the making of the film. Featurettes can be a fascinating extra, especially for films with ambitious effects or practical stunts.
Red-band trailers
In the US, a red-band trailer is approved only for mature audiences and may contain language or violence that wouldn't appear in an all-audiences ("green-band") trailer. They are common for R-rated comedies and horror films. For more on age ratings, see our guide to movie ratings.
How trailers are made
Trailers are often produced by specialist agencies working alongside the studio's marketing team, and they are frequently edited while the film itself is still being finished. That has a few interesting consequences:
- Footage can change. Shots in a trailer sometimes look different in the final film, or don't appear at all, because effects were still being completed or scenes were later cut.
- Music is often not from the film. Trailers regularly use separate music, including dramatic remixes of familiar songs, chosen to match the edit.
- The tone can be adjusted. A trailer may emphasise action, comedy or romance depending on the audience the campaign is targeting, so it is a guide to how the studio is marketing the film, not a perfect summary of it.
Why trailers sometimes spoil the plot
This is the part most viewers never think about. Marketing teams face a real dilemma: audiences tend to respond to trailers that show a lot, but showing a lot can give away the story. Some trailers reveal major turning points, or even the final act, because research suggests it helps sell tickets. Other campaigns are deliberately secretive.
How to watch trailers without spoilers
- Watch the teaser and the first trailer, then stop. These usually establish the premise without revealing much of the second half.
- Be wary of "final trailers" and TV spots if you care about surprises.
- Mute or skip social media clips in the weeks before release, when the most footage circulates.
- Read the synopsis instead. An official one-paragraph synopsis often tells you enough to decide.
- Use trailers for tone, not plot. Ask yourself: does the style, pace and humour appeal to me?
What a good trailer tells you
Even if you avoid spoilers, trailers answer some useful questions quickly:
- Tone: is this a light comedy, a tense thriller or a slow-burn drama?
- Visual style: handheld and gritty, or polished and colourful?
- Performances: does the lead actor's style work for you?
- Scale: intimate character piece or effects-heavy spectacle?
If those answers match what you want from your evening, the film is probably worth adding to your watchlist.
Where to find official trailers
The safest place for trailers is the studio's or distributor's official channel, or a site that embeds those official videos. On 123Movies, title pages embed official trailers via YouTube alongside cast, ratings and release information from TMDB, so you can browse by mood: try horror for jump scares, comedy for something light, or animation for the whole family. Our TV shows section includes series trailers too.
Treat trailers as what they are: a studio's pitch, useful for judging tone and style, less reliable as a plot summary. Once you've found something worth your evening, our guide to finding where a movie is streaming legally shows how to watch the full film through a legitimate service.
