How to make a book trailer with AI: script, shots, music and a credit budget

A book trailer is a 30-to-60-second film that sells a feeling, not a plot: the world, the mood, the question the book asks, and the cover. That brief is exactly what AI generation is good at, because a trailer needs atmosphere in short shots rather than actors delivering lines. This guide makes one end to end, with a six-beat script, a still per beat, three animated shots, a score generated to the trailer's length, an edit with title cards, and the credit arithmetic for doing it on PrismPoster's Free plan.

What makes a book trailer work?

A trailer that sells a book shows the world and withholds the story: one setting, one mood, one question on a title card, the cover at the end, and nothing that looks like a film adaptation the book cannot deliver.

Readers know the trailer is not the book. What persuades them is tone. A thriller trailer that is all rain-slicked streets and one line of text does more than a montage of every plot point, and it is also far easier to make. Keep the script to six beats, keep every beat under eight seconds, and let the last beat be the cover with the author's name and where to buy it.

Step 1: write the six-beat script

1. The world (6 s). One wide image of the setting. No text.
2. The character (6 s). A figure in that world, seen from behind or in silhouette, so the reader can still imagine them.
3. The disturbance (6 s). The thing that changes: a light in a window, a letter, a storm. Title card: the book's central question, in seven words or fewer.
4. The stakes (6 s). A tighter shot, more motion, the mood at its darkest or brightest.
5. The hook (6 s). A single line from the book, or the tagline, over an image that answers beat 3.
6. The cover (8 s). Cover, title, author, release date, retailer. Music resolves here.

Six beats at six to eight seconds is roughly 40 seconds, which fits every platform including a vertical cut. Draft the beats on a storyboard template and list the shot types on a shot list template; storyboard examples has a worked ad board in the same shape.

Step 2: generate one still per beat

Generate the six stills in PrismPoster's Image Studio at 16:9 for YouTube and the retailer page, and again at 9:16 if you want a Reels or Shorts cut; each image costs 20 credits. Write one style sentence and reuse it in every prompt ("overcast Nordic coast, film grain, muted teal and rust, 35 mm lens") so the six shots read as one film. Describe the character by clothing, posture and setting rather than by face, both because a faceless figure lets the reader cast the role and because photos of real, identifiable people are not accepted as generation inputs. If the book has a recurring object, a lighthouse, a key, a red coat, put it in three of the six frames; repetition is what makes a trailer feel authored.

Step 3: animate the three beats that need motion

Not every beat needs to move. Beats 1, 3 and 4 usually do: the world drifting, the disturbance arriving, the stakes rising. Animate those three with image to video in the Video Studio, which renders clips of 4, 6, 8, 10 seconds at 16:9 or 9:16, with one camera instruction per clip: "slow push in", "wind moves the grass", "the light flickers on". Draft at 360p for 30 credits per clip to check the motion, then re-render the keepers at 720p. The other three beats stay as stills with a slow scale on the timeline, which reads as intentional and costs nothing.

Step 4: score it to length

A trailer's music has to resolve on the cover, which is why a library track trimmed to 40 seconds rarely works: the ending lands mid-phrase. Generate the score to the trailer's exact length in the Music Studio: an instrumental brief such as "40-second cinematic build, low strings, a single piano motif, resolves on a held chord" returns a track with stems for 25 credits, so the piano can be pulled forward under the title card and the strings held back until beat 4. Licensing for generated music is set out plainly in AI music licensing explained.

Step 5: assemble the trailer

On the timeline editor, lay the six beats in order, place the three clips and three stills, and add the title cards as text over beats 3, 5 and 6 in one typeface, ideally the cover's. Cut beats 1 to 5 on the music's phrases (tap the tempo into the BPM tapper to find the bar length) and hold the cover for the music's resolution. Add captions if any line is spoken. Export 16:9 at 1080p for YouTube and the retailer page; for a vertical cut, regenerate the three moving beats at 9:16 rather than cropping them, and crop the stills with the crop image for video preview.

What does an AI book trailer cost in credits?

Six stills at 20 credits each is 120 credits. Three 360p drafts at 30 credits each is 90. One score at 25 credits. The working total is 235 credits before retries, and a second set of six stills to pick from doubles the image line. A free account starts with 200 starter credits, and a mid-size credit pack covers a trailer per book with room for re-renders at 720p. Pricing is on /pricing.

How should a book trailer be labelled?

Generated footage in a trailer is fine to publish and is also, in the EU, something readers must be able to recognise as synthetic where it could be mistaken for real. Keep the disclosure simple: an "AI-generated visuals" line in the end card or the description. The creators' guide to AI content labeling covers what the rules actually require, and PrismPoster's exports carry provenance metadata as described in the help centre's labelling section.

Other ways to get from an idea to a finished video: animating AI art, How to make an animated poster with AI, How to animate a photo with AI, How to make an explainer video with AI, and turning product photos into video.

Frequently Asked Questions

How long should a book trailer be?

Thirty to sixty seconds. Six beats of six to eight seconds each lands around forty seconds, which holds attention on YouTube and cuts cleanly to a vertical version for Reels and Shorts.

Can AI make a book trailer for free?

The workflow above runs on a free PrismPoster account, which starts with 200 starter credits in most regions; six stills, three 360p clips and a score cost 235 credits before retries. The free browser tools (storyboard templates, shot list, BPM tapper, crop preview) cost nothing, and beyond the starter credits there is no subscription, only one-off credit packs from €3.99.

Should a book trailer show the characters' faces?

Usually not. Silhouettes, figures from behind and hands let readers cast the character themselves, and generated faces that later contradict a reader's mental image work against the book. Photos of real people are also not accepted as generation inputs.

What music can I use in a book trailer?

A track you hold a licence for, a public-domain recording, or a generated score. Generating the score to the trailer's exact length is the practical choice because the ending resolves on the cover instead of being cut off mid-phrase.