What Is a Logline? Definition, Formula and Examples
What is a logline?
What is a logline? A logline is a one-sentence summary of a story that names the protagonist, what they want, what stands in the way and what they stand to lose. That’s the short logline definition. In film and TV, writers use it to pitch a script in seconds and to test whether the story works before they write a scene.
Here’s one for an original short we’ll use throughout this guide: “A tour guide who’s terrified of the dark must lead twenty strangers out of a pitch-black mountain tunnel after a rockslide seals them in, before floodwater closes the only exit.” One sentence gives you the hero, the problem, the clock and why it’s hard for her.
What a logline is for
A pitch tool
Producers, agents and contest readers often meet your story as a single line before they open the script. BBC Writersroom’s guide to writing loglines notes that agents, producers and executives each write one to sell the project further up the chain. Festival forms often ask for one too; see where to submit short films.
A development tool
Before anyone else reads it, the logline tests the story. If it won’t fit in one clear sentence, it usually isn’t clear yet: the goal is vague, the opponent is missing or the stakes are abstract.
The elements of a logline
Many screenwriting guides break a logline into four core elements:
- Protagonist: a role and a defining trait, not a name.
- Inciting incident: the event that starts the story.
- Goal: the concrete thing the protagonist sets out to do.
- Conflict: the obstacle or opponent in the way.
Two more make it memorable: stakes (what happens if the hero fails) and irony (a hero who is the worst possible person for this problem). Save the Cat! sums up the essentials as “Someone (the protagonist) wants something (the story goal) and goes after it against great odds and/or obstacles.”
The tunnel logline, marked up:
A tour guide who’s terrified of the dark must lead twenty strangers out of a pitch-black mountain tunnel after a rockslide seals them in, before floodwater closes the only exit.
- Protagonist: a tour guide.
- Trait and irony: terrified of the dark, the one fear this situation attacks.
- Goal: lead twenty strangers out.
- Inciting incident: the rockslide that seals the tunnel.
- Conflict and stakes: rising floodwater and a single exit.
No names, backstory, subplots or ending: a logline sells the situation, not the plot.
Logline formula
A logline formula is a scaffold, not a rule: fill one in, then rewrite until it sounds like your story. These two logline templates cover most genres.
[Protagonist + defining flaw] has to [concrete goal]
after [inciting incident];
if they fail, [what they lose].Worked example: “A con artist who has never told the truth has to win a small-town honesty contest after he’s caught stealing its prize money; if he fails, he goes to prison.”
The last person who should [face this problem],
[protagonist], is forced to [goal]
while [opponent or obstacle] closes in.Worked example: “The last person who should be guarding a dragon’s egg, a clumsy apprentice baker, is forced to carry it across the kingdom while the queen’s knights hunt them both.”
Hero-first is clear and safe for pitches; irony-first leads with the hook, which suits comedy and high-concept stories. Our guide to making an AI short film pairs a third, short-film version with a beat template.
Logline examples
These logline examples for well-known films are written in our own words, keep the endings out, and note what each one carries.
Famous movie loglines
- Titanic (1997): “A young first-class passenger dreading an arranged engagement falls for a penniless artist aboard a celebrated ocean liner’s maiden voyage, and must fight for the life she wants while the ship heads toward disaster.” Goal: choose her own life. Stakes: her future, then her survival.
- Harry Potter and the Sorcerer’s Stone (2001): “An orphan raised by cruel relatives learns on his eleventh birthday that he’s a wizard, and at his new school of magic must stop the dark wizard who killed his parents from returning.” Trait: an outsider unaware of his power.
- Jaws (1975): “A police chief who’s afraid of the water must hunt a great white shark that’s killing swimmers off his island resort town, while the mayor insists on keeping the beaches open.” Irony: the hero fears the water.
- Back to the Future (1985): “A teenager accidentally sent thirty years into the past must make sure his teenage parents fall in love, or he’ll erase himself from existence.” Stakes: his own existence.
- Finding Nemo (2003): “An overprotective clownfish must cross the ocean to rescue his only son after a diver captures him, with a forgetful stranger as his only guide.” Irony: the most cautious fish takes the riskiest trip.
- The Martian (2015): “An astronaut presumed dead and left behind on Mars must use his botany skills to survive on scarce supplies until a rescue can reach him.” Clock: the supplies.
A TV show logline sets up an engine for many episodes rather than one goal. Breaking Bad (2008): “A high school chemistry teacher diagnosed with terminal cancer starts cooking methamphetamine to secure his family’s future.”
Short film logline examples
A short film logline needs a smaller problem, often in one location:
- “A retired magician determined to perform one last trick at his granddaughter’s wedding must hide his worsening hand tremor from the family who begged him to stop.”
- “Two rival food-truck owners parked on the same corner must share one generator through a heatwave, or both lose the festival permit they’ve spent a year chasing.”
For more, see our short film ideas.
An AI short film logline
AI shorts depend on a visual hook, so the film logline should promise images: “On the last night before the sea swallows her village, a lighthouse keeper’s daughter rows out to relight a lamp no one has climbed in fifty years.” Every clause suggests a shot, which is exactly what a trailer built with AI needs.
How to write a logline, step by step
Here’s how to write a logline by repairing a weak one: “A man tries to get home.” It fits thousands of stories. Five passes fix it.
- Make the protagonist specific: “A long-haul trucker tries to get home.”
- Add the inciting incident: his ex-wife’s custody hearing is moved up a day.
- Make the goal concrete: reach the courthouse by morning, three states away.
- Add the obstacle and stakes: a blizzard, and losing custody of his daughter.
- Add irony, then tighten: make the flaw collide with the goal.
The result: “A trucker suspended for falling asleep at the wheel must cross three states overnight, through a blizzard, to reach his daughter’s custody hearing before the judge rules without him.” Now it has a hero, a clock, an obstacle and stakes.
Before you call it done, check:
- One sentence, in present tense.
- Strong, active verbs: races, hunts, must stop.
- No names, unless the character is already famous.
- No ending spoiler. Sell the question, not the answer.
- The genre is obvious from the words alone.
Next, write the outline and screenplay with our guide on how to write a movie script. Many writers expand the logline into a beat sheet or a film treatment first.
How long should a logline be?
One sentence is the convention. BBC Writersroom says loglines are traditionally one sentence long; two short sentences are possible if the work demands it, but best avoided because they drift toward a synopsis.
There’s no official word count. A useful test is breath: if you can’t say it aloud in one breath, it’s too long. The movie loglines in this guide run roughly 25 to 35 words. A logline should make someone ask for the script, not replace it.
Logline vs tagline vs premise vs synopsis
These four often get mixed up. Side by side:
| Term | What it is | Length | Who it’s for | Example (tunnel story) |
|---|---|---|---|---|
| Logline | The story in one line: protagonist, goal, conflict, stakes | One sentence | Producers, agents, contest readers, and you while developing | A tour guide who’s terrified of the dark must lead twenty strangers out of a pitch-black mountain tunnel after a rockslide seals them in, before floodwater closes the only exit. |
| Tagline | A marketing hook for posters and trailers; sells a feeling, not the plot | A short phrase | The audience | Twenty strangers. One flashlight. No way back. |
| Premise | The core idea or “what if” behind the story | A phrase or short question | You and your collaborators | What if someone afraid of the dark had to lead others through it? |
| Synopsis | A summary of the whole plot, including the ending | Several paragraphs to a few pages | Readers who already asked for more | Mara checks her flashlight three times before every tour. Today a rockslide traps her bus… (continues through the ending) |
Logline vs synopsis comes down to the ending: a logline withholds it, a synopsis gives it away. Logline vs tagline is purpose: a logline helps someone decide whether to read or make the story, while a tagline hooks someone deciding whether to watch it.
How AI can help you write a logline
AI is good at producing variations and bad at deciding which story you want to tell. Use it for the first and keep the second.
Generate variants, then stress-test them
Give an AI assistant your rough idea and ask for a version in each formula above. Then ask of each: whose story is this, and what exactly is lost if they fail? You pick the line and rewrite it in your voice. Our guide on whether ChatGPT can write a movie script covers where assistants help and where they flatten a story.
Turn the logline into a script in CinemaDrop
In CinemaDrop, paste your logline as the idea in Script Wizard’s Concept step to get five concept directions, then build the outline and script from the one that fits. Concept costs 15 credits, Outline 10 and Script 20: 45 in total, inside the free Lite plan’s 50 one-time credits. For tools focused on the sentence itself, see our logline generator for films and AI tool to write a logline pages.
See whether the logline holds on screen
Most logline guides skip this test: draw it. From the finished script, Script Wizard’s Elements step extracts the characters, locations and key props (55 credits, so it needs a paid plan’s credits). Create a storyboard from there, or paste the script into a new storyboard, and @-tag the Elements in shot prompts so the same character appears in every frame. Then draft three shots:
- The opening image: the protagonist and the flaw, before anything happens.
- The inciting incident: the moment the ordinary day breaks.
- The stakes moment: the image that shows what failure would cost.
If the three frames tell the story without words, the logline works. If they look unrelated, the logline promises a story the script doesn’t have yet. Storyboards and image generation are included on the free plan, within its credits; video needs Basic or higher. For the full process, see how to storyboard with AI.
FAQ
What is a logline?
A one-sentence summary of a story naming the protagonist, goal, conflict and stakes, used to pitch a script and test the story.
How long should a logline be?
One sentence. There’s no official word count, but if you can’t say it in one breath, cut it.
Should a logline be one sentence?
Traditionally, yes. Two short sentences are acceptable when a story truly needs them, but avoid it if you can.
What are the four elements of a logline?
The usual four are protagonist, inciting incident, goal and conflict. Strong loglines add stakes and an ironic hook.
What is the difference between a logline and a tagline?
A logline summarizes the story for people deciding whether to read or make it. A tagline is a marketing phrase that sells a mood.
What is a logline vs a premise?
A premise is the underlying “what if” idea. A logline turns it into a specific story with a protagonist, a goal and an obstacle.
What is the logline for Titanic?
There’s no single official one. Ours: a young first-class passenger dreading an arranged engagement falls for a penniless artist on a liner’s maiden voyage and must fight for the life she wants as the ship heads toward disaster.
Can AI write a logline?
AI can draft variants quickly, but the choice and final wording should be yours. In CinemaDrop, Script Wizard then turns your chosen logline into concepts, an outline and a script.
From logline to storyboard
A logline is one sentence that carries the whole story: a specific hero, a concrete goal, a real obstacle and a reason to care. Write it first, rewrite it often, and test it in pictures.
When yours is ready, start a script from your logline in CinemaDrop and grow it into a storyboard. Plans and credits are on the pricing page.
