# Best Synthesia AI Prompts for Social Media Reels: Ideas That Actually Work > source: https://promptsio.com/synthesia-ai-prompts-social-media-reels/ > published: 2026-10-06T17:53:17+00:00 > updated: 2026-10-06T17:54:07+00:00 > topic: Marketing & Social Media Eleven Synthesia AI prompts and script templates for social media reels, with hook formulas, vertical layout tips and disclosure guidance for AI presenters. Short vertical video lives or dies in the first three seconds, so the best Synthesia AI prompts for social media reels are really script prompts: tight hooks, one idea, fast pacing and clear captions. Synthesia is built around AI presenters that deliver a script you write, and it is mostly associated with explainer, training and business video. Reels are a slightly different format, so you will need to adapt: vertical framing, shorter lines and on-screen text. Check the tool's current features, supported aspect ratios and templates. Using an AI presenter carries responsibilities. Use only avatars and voices you have rights and consent to use, and tell viewers when a presenter is AI-generated, following each platform's current labelling rules. ## How Synthesia Works for Reels You pick a presenter, paste a script, choose a background and add visuals or text, then export. A presenter-led reel suits explainers, tips, product updates and announcements. It is less suited to trend-driven, raw or comedy content that depends on real human spontaneity, so choose topics where clarity matters more than personality. ## The Prompt Formula **[Topic + one takeaway] + [platform + length] + [hook type] + [beats] + + [call to action] + [claims limit]** | Slot | Example | |---|---| | Length | 25 seconds, about 60 words | | Hook | a counterintuitive tip | | Beats | hook, problem, fix, proof, action | | Claims | no statistics unless I provide them | Roughly 2.5 words per second is a workable pace for spoken lines. ## Basic vs Improved Prompt Basic: `Write a reel script about productivity.` Improved: ``` Write a 25-second vertical reel script (about 60 spoken words) for [BRAND/ACCOUNT] aimed at [AUDIENCE] on one takeaway: [TAKEAWAY]. Structure: 3-second hook that names the problem, 8-second explanation, 8-second example from my notes, 4-second action step, 2-second call to action to [ACTION]. Conversational, confident, short sentences. Provide an on-screen caption for each beat (max 6 words) and one text overlay for the hook. Use only the facts in my notes: [NOTES]. No made-up statistics. ``` ## Hook Prompts ### Hook bank ``` Generate twelve opening lines (max 12 words each) for a reel about [TOPIC] for [AUDIENCE], grouped into four types: question, mistake warning, surprising-but-true fact from my notes, and promise of a specific result. Notes: [NOTES]. Avoid clickbait I cannot deliver on and avoid phrases like "you won't believe". ``` ### Pattern interrupt ``` Write three versions of a first-three-seconds line plus visual instruction for a reel on [TOPIC], each using a different pattern interrupt: a bold on-screen statement, a mid-sentence start, and a direct "stop doing this" correction. Include what appears on screen alongside the spoken words. Keep each under 15 words. ``` ## Script Prompts by Reel Type ### Quick tip reel ``` Write a 20-second tip reel: "[TIP]" for [AUDIENCE]. Beats: hook, why people get it wrong, the simple fix in two steps, a tiny example, and one-line sign-off. About 50 words total. Add captions of up to 5 words per line. Friendly and direct. No jargon. ``` ### Product or feature update ``` Create a 30-second reel announcing [FEATURE/UPDATE] for [PRODUCT]: the problem it solves, what changed, one concrete use case, and where to find it. Use only this information: [FACTS]. Neutral, helpful tone. Do not claim speed, savings or results unless listed in my facts. End with the action [ACTION]. ``` ### Myth versus fact ``` Write a myth-versus-fact reel on [TOPIC]: state the common myth, flip to the accurate version using this verified information: [FACTS/SOURCE], and finish with one practical takeaway. 30 seconds, about 70 words. Add captions and a suggested on-screen label "Myth" and "Fact". Do not add facts beyond what I supplied; mark anything uncertain as [VERIFY]. ``` ### Behind-the-scenes explainer ``` Turn these notes about how [PROCESS] works at [COMPANY] into a 35-second explainer reel with three numbered steps, each with a simple visual suggestion (screen recording, icon, diagram). Notes: [NOTES]. Warm, transparent tone. Avoid revealing anything marked confidential: [CONFIDENTIAL ITEMS]. ``` ### Customer question reel ``` Turn this real customer question into a 25-second answer reel: "[QUESTION]". Open by reading the question as on-screen text, give the answer in two short steps using my approved answer: [ANSWER], and close with a pointer to [WHERE TO LEARN MORE]. Calm, helpful tone, no promises beyond my answer, and flag anything that needs legal or expert review as [REVIEW]. ``` Answering real questions gives a built-in hook and suits an informational presenter well. ## Layout and Repurposing Prompts ``` Suggest a 9:16 scene plan for the script below: presenter placement, background color or image, text overlay timing, and where to keep text away from the bottom area where platform buttons and captions appear. Provide a table with time range, visual, on-screen text and spoken line. Script: [PASTE]. Brand colors: [COLORS]. ``` ``` Repurpose this blog post excerpt into three 25-second reel scripts, each with a different angle (problem, tip, mistake). Keep every claim true to the excerpt and note which sentence it came from. Excerpt: [PASTE]. ``` ## A Multi-Step Workflow - **Pick one takeaway** per reel. - **Hook bank prompt** for twelve options; choose two. - **Script with the improved prompt**, adding your facts. - **Trim.** Ask: `Cut this to 55 words without losing the takeaway.` - **Scene plan** with the layout prompt; build the video in Synthesia and add captions. - **Check and label.** Confirm facts, review captions for readability, and apply any AI-content label required by the platform. ## Tips and Common Mistakes - **Cramming multiple ideas.** One reel, one point. - **Slow openings.** Get to the problem immediately. - **Reading a blog post aloud.** Rewrite for speaking. - **Unlabelled AI presenters.** Disclose them. - **Ignoring silent viewing.** Add captions. - **Unverified claims.** Keep numbers to those you can source. - **Expecting trend-style authenticity.** An avatar suits informational content better than personal vlogs. Related reading: [Fliki AI prompts for social media reels](https://promptsio.com/free-fliki-ai-prompts-social-media-reels-examples/), [scroll-stopping social media post prompts](https://promptsio.com/ai-prompts-scroll-stopping-social-media-posts/) and [35 AI sales prompts](https://promptsio.com/35-ai-sales-prompts-to-book-more-meetings-and-close-deals-faster/) for turning attention into conversations. ## FAQ ### Can Synthesia make vertical videos? Check the current aspect ratio options and templates, as features vary and change. ### How long should a reel be? Short reels of 15 to 30 seconds suit quick tips, while explainers can run longer. Match length to the point being made. ### Do I need to say the presenter is AI? It is good practice, and some platforms require labels. Review each platform's current policy. ### Can I use my own likeness? Many tools offer personal avatars with a consent process. Check the current steps and terms. ### Will AI presenters perform well? Results depend on content quality, hooks and audience; there are no guarantees. ## Conclusion Presenter-led reels work when the script is sharp: one takeaway, a fast hook and verified facts. Use the prompts above to draft hooks, scripts and scene plans, adapt for vertical, and label AI presenters honestly. --- Published by Promptsio. Canonical version: https://promptsio.com/synthesia-ai-prompts-social-media-reels/