What Is a Logline? How to Write One That Sells Your Script

A logline is your screenplay compressed to a single sentence: who the story is about, what they're trying to do, what stands in their way, and why it matters. It is the most disproportionately important sentence you will ever write — a script that took a year to finish will live or die by twenty-five words, because in the real economy of the industry, nobody reads a script until something smaller convinces them to. Learning how to write a logline isn't marketing homework bolted onto the creative work. Done honestly, it's a diagnostic that tells you whether you have a movie at all.

The Formula — and Its Limits

The standard scaffold looks like this:

When [inciting incident], a [adjective + protagonist] must [objective] before/or else [stakes], but [obstacle or complication].

Filled in: When a great white shark begins killing swimmers in a beach town, a water-phobic sheriff must hunt it down before the summer crowds arrive — against a mayor who refuses to close the beaches.

Every load-bearing element is present: a protagonist described by the trait that matters (water-phobic, not brave or forty-something), a concrete goal, a ticking clock, and opposition on two fronts. Note what's absent: the protagonist's name (nobody cares yet), theme, backstory, and the ending — a logline sells the question, not the answer.

Now the limits. The formula guarantees completeness, not life. Run a mediocre idea through it and you get a grammatically perfect sentence describing a movie no one wants to see. The formula is a checklist for what a logline must contain; what makes one actually work is harder to template — and that's what the famous examples teach.

What Great Loglines Have in Common

Look at how these well-known films reduce to a sentence:

• Alien: The crew of a commercial space freighter picks up a distress signal — and brings back something that begins killing them one by one. A haunted house in space. The setting collision alone sells it.
• Liar Liar: A lawyer who lies for a living becomes magically unable to lie for 24 hours. The premise is an irony machine: the protagonist's defining skill becomes his affliction.
• Groundhog Day: A cynical weatherman covering a small-town festival gets trapped reliving the same day until he gets it right. The trap is perfectly matched to the man — repetition inflicted on someone contemptuous of the place he's stuck in.
• Die Hard: An off-duty New York cop, visiting his estranged wife's office party, becomes the only person inside when terrorists seize the building. Wrong man, worst place, personal stakes built directly into the location.

The shared ingredient is irony — not sarcasm, but the friction of a character fused to the one situation designed to hurt them. A water-phobic sheriff on a shark hunt. A liar who can't lie. Irony is why these loglines feel like they generate scenes on contact: you hear the sentence and involuntarily start imagining the movie. That involuntary imagining is the entire job. A logline doesn't summarize your script; it detonates it in the listener's head.

The second shared ingredient is specificity. "A woman fights to save her family" describes ten thousand scripts. "A mother must keep her two children silent for months in a house stalked by creatures that hunt by sound" describes exactly one. Every vague word in a logline — struggles, journey, dark secret, must confront their past — is a place where the movie leaks out of the sentence.

Stakes: The Part Writers Forget

Most broken loglines are missing the or else. "A retired thief plans one last heist" — fine, and if it fails? He goes back to retirement? Stakes are what convert a goal into a story, and they work best when they're double-layered: something external and concrete (prison, death, losing the house) fused to something internal (proving he's not his father, earning back a daughter's trust). You usually can't fit both layers in the sentence — lead with the concrete one, and let the internal layer surface in the pitch that follows. If you're not sure your script has that second layer, that's a deeper problem than the logline — see our guide to want versus need in character arcs.

Testing Yours

Draft ten versions, not one — the first is always the plot summary, and the good one is usually hiding around draft six. Then test:

1. The stranger test. Say it out loud to someone who owes you nothing. Watch their face, not their words. Politeness looks different from the small forward lean of someone who wants to know what happens. If they ask a question about the story, you've won. If they ask a question because the sentence confused them, rewrite.
2. The poster test. Can you picture the one-sheet? Loglines that work are almost always visual at the core.
3. The "so what happens?" test. A strong logline implies dozens of scenes. If even you can't immediately name five scenes the premise generates, the script — not the sentence — may be undernourished.
4. The vagueness scan. Circle every abstract word and replace it with the concrete thing it's hiding. Dark past becomes the bank job that got his brother killed. Always sharper.
5. The honesty test. Does the logline describe the script you wrote, or the script you wish you'd written? Executives read the script eventually. A logline that overpromises just relocates the rejection.

When to Write It (Earlier Than You Think)

The industry-facing use of a logline — query emails, pitch meetings, contest entries, the answer to "so what's it about?" at a party — comes at the end. But its highest value comes at the beginning, before you've written a page. A premise that won't compress into a compelling logline almost never uncompresses into a compelling script, and it's better to learn that in an afternoon than after a six-month draft. That's why loglines sit at the front of our beginner's guide to writing a screenplay, and why many working writers keep the current logline pinned above the script while drafting — every scene either serves that sentence or gets interrogated. Some writers keep it in a title-page note or a document right beside the draft in their screenwriting app so it stares back at them daily.

One sentence. Ironic if the premise allows it, specific always, stakes visible, ending withheld. It's the hardest twenty-five words in screenwriting, which is fitting — they're the twenty-five words that decide whether anyone reads the other twenty thousand.