Verdict first: if you have between $500 and $5,000 and you’re about to hire a video editor, the single most valuable thing you can do before you spend a dollar is write the trailer script yourself. Not a mood board. Not a paragraph of vibes. A timestamped, one-page document an editor can execute without calling you. The reason most low-budget trailers come back wrong isn’t bad editing—it’s that the author handed over a feeling instead of a script, and the editor had to guess. A screenplay, as StudioBinder puts it, is “the industry standard document that serves as the foundation of a film,” and proper format “helps ensure that a screenplay is easy to read and execute during production.” Your trailer deserves the same treatment, scaled down to 30 seconds.

The Brief Is the Script

Authors are often told to write a “brief” for their editor, and then they write something like: “My book is a moody psychological thriller about grief. I want it to feel like fog.” That’s not a brief; that’s a mood board with a deadline. A brief and a script are the same document at this budget. The editor you can afford at $500–$5,000 is buying execution time, not creative development—every discovery call, every “what did you mean by this?” email, and every round of “actually, can we try it differently?” comes out of hours you already paid for. Treat the brief as a script and the editor comes back with a cut instead of questions.

The Three Real Components

A trailer script is three separable tracks. Splitting them matters because it lets you revise one without breaking the others—which is critical when your budget covers one, maybe two rounds of editor revisions.

1. Voiceover Copy

This is what the narrator actually says, written to be read aloud. In screenplay format, voice-over is marked with a (V.O.) extension on the character name, and the visual and audible action on screen is described in action lines written in third person, present tense. You don’t need full screenplay formatting for a 30-second trailer, but you do need the discipline behind it: the VO copy is a spoken track, not prose. Read it out loud. If you stumble, the narrator will too.

For a 30-second trailer, the VO is the binding constraint. Write it first, time it out loud with a stopwatch, and build everything else around what survives. Don’t rely on a published words-per-second figure—read your own copy at your own pace and cut until it fits with breathing room. If your VO runs 28 seconds, you have no room for the title card to land. Cut copy until the read comes in around 22–24 seconds.

2. On-Screen Text

Title card, tagline, pull quotes, retailer call to action—these are a separate track from the VO, and they should be written separately so the editor can time them independently. A title card needs two to three seconds to register; a pull quote needs longer if viewers are expected to actually read it. If you bury the title in the same paragraph as the VO, the editor will guess when it appears, and the guess will be wrong.

3. Shot/Beat Timing

This is a timestamped beat sheet: what image sits under each line, and when. Something like 0:00–0:03 hook, 0:03–0:10 setup, 0:10–0:20 escalation, 0:20–0:27 title reveal, 0:27–0:30 call to action. One caveat from the screenwriting world: the best professionals suggest shots without writing them into the script, and writing out specific camera directions is generally frowned upon—unless you’re the one directing. You’re not. Describe the image and the beat, not the lens.

A Worked Example: 30 Seconds, Hypothetical Thriller

This is a hypothetical thriller—”The Ferryman’s Daughter,” a standalone suspense novel about a woman who discovers her father’s charter boat business was laundering money for a smuggling ring. The script below is illustrative, not a template to copy, but it shows all three tracks in one page.

0:00–0:03 — Black screen. Sound: water lapping a hull. VO: “My father kept two sets of books.”
0:03–0:08 — Image: dawn harbor, one boat, one figure coiling rope. VO: “I only found the second one after he drowned.”
0:08–0:15 — Image: ledger pages, a hand tracing a column of names. VO: “Every name in it is someone who’s disappeared.”
0:15–0:22 — Image: the boat at night, a second silhouette on deck. VO: “One of them is still alive. And he knows I have the book.”
0:22–0:26 — On-screen text: THE FERRYMAN’S DAUGHTER (title card, held 3 seconds).
0:26–0:30 — On-screen text: “A novel of suspense.” Retailer logo / call to action.

Count the tracks: five VO lines, two text cards, six beats. That’s a complete production document. An editor can source or shoot every image from that page without a single clarifying email.

Timing Math: Why 30 Seconds Is a Short Script

Standard screenplay convention holds that one page of properly formatted script equals roughly one minute of screen time. That ratio is for feature screenplays, not trailers, but it makes the point: a 30-second trailer is a fraction of a page. Your entire script is shorter than one scene of a movie. That’s why the VO-first rule matters—at this length, there is no room for copy that runs long, and no editor trick that fixes it. Cut before you send.

Drafting the Copy: Where a Script Generator Fits

The hardest part of the script is usually the blank page. If you can’t get past it, an AI script generator used as a drafting tool is one legitimate option in the workflow—positioned at the blank-page stage, not the final-draft stage. The same principle that governs plot generators applies here: the more specific your inputs—genre, tone, protagonist, central conflict, what’s at stake—the more the output will feel like yours. Feed it “psychological thriller, restrained tone, protagonist is a grieving daughter, conflict is a hidden ledger, stakes are her life” and you’ll get back something you can work with. Feed it “thriller about secrets” and you’ll get back wallpaper.

Iterate the way you’d iterate any draft: lock the lines that work, regenerate the rest, and converge rather than starting over each time. That lock-and-regenerate workflow is exactly how structured generators are designed to be used.

Editing AI Drafts Back to the Book’s Voice

Here’s the hard boundary. AI outputs are, as the Authors Guild notes, “generic mashups of pre-existing works ingested during training”—not original human authorship. They also frequently generate fabricated information presented as factual, which means you fact-check every line against your own book. Treat an AI-drafted VO line the way you’d treat a beta reader’s suggested line: a prompt, never pasted in unedited. The Authors Guild’s guidance for authors using AI is direct: don’t let it replace your unique voice, thinking, and creativity—the words and thoughts should be your own. Your trailer is advertising your book’s voice. If the trailer’s voice isn’t yours, the brief has failed before the editor ever opens the file.

What to Hand the Editor

One page. Timestamps down the left margin, three tracks clearly separated, VO copy timed out loud before you send it, on-screen text listed with its own durations, and no camera directions. A one-page brief is more useful at this budget than a longer document because the editor’s time is the scarce resource—every extra page you send is minutes of your budget spent reading instead of cutting. Attach your cover file, your font, and your retailer link. Then stop. The editor’s job is to translate that page into motion; your job ended when the page was finished.

The Bottom Line

Write the trailer before you hire the editor. Write the VO first and time it out loud. Keep the on-screen text on its own track. Timestamp every beat. If you draft with a generator, feed it everything specific and then rewrite every line until it sounds like your book. The authors who get good trailers at $500 are the ones who hand over a script; the ones who get bad trailers at $5,000 are the ones who hand over a mood.