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Synthesia AI Video Generator Prompts: Create Professional AI Videos with Avatars, B-Roll, Voiceovers & Music

Synthesia AI Video Generator Prompts: Create Professional AI Videos with Avatars, B-Roll, Voiceovers & Music

Ildar Ibiatov
Ildar Ibiatov

Table of Contents

Why Synthesia-Style Video Creation Is Moving Beyond Avatars

The synthesia ai video generator search used to mean one thing: type a script, pick an avatar, generate a talking-head video. That’s still useful. But the market is shifting toward complete AI production suites that combine avatars, generative B-roll, image editing, voiceovers, music, captions, localization, and platform-ready edits.

Synthesia’s September 4, 2025 Express-2 announcement is a strong signal of that shift, with full-body expressive avatars, unified voice, lip-sync, and body language, plus 1080p, 30fps avatar output described by Synthesia. (synthesia.io) Google’s Veo updates show the other side of the same trend: cinematic generative video clips, vertical formats, and higher-resolution workflow options are becoming part of everyday production planning. (blog.google)

a professional creator workspace showing an AI avatar video scene on a large monitor

What Creators Want From a Synthesia-Style AI Video Generator

Most creators searching for a synthesia ai video generator don’t just want a digital presenter. They want fast, business-ready video production without booking a studio, hiring voice talent, or spending days in editing software.

Here’s the usual wish list:

Creator need What it means in practice
Fast script-to-video Turn a blog post, product page, course outline, or sales script into scenes quickly
Presenter-style avatars Use AI avatar videos for explainers, training, demos, announcements, and onboarding
Multilingual voiceovers Localize the same video for different markets without rerecording everything
Captions Improve accessibility, silent autoplay performance, and social media clarity
Business-ready templates Keep layouts consistent for product demos, updates, tutorials, and learning content
Flexible editing Add B-roll, product shots, music, thumbnails, overlays, and multiple exports

Synthesia’s own help materials describe workflows for turning text, PowerPoints, and PDFs into browser-based videos with avatars, voices, templates, brand elements, translation, dubbing, and captions, depending on the plan. (help.synthesia.io)

The Prompt Framework I Use for Professional AI Videos

A strong prompt saves time because it gives every AI tool the same creative brief. I recommend writing one master prompt, then splitting it into scene prompts for your avatar, B-roll, voiceover, visuals, and music.

Use this framework:

Prompt element What to specify Example
Audience Who the video is for “First-time Shopify sellers”
Goal What the viewer should do “Understand how to launch a product page”
Format Length and platform “90-second YouTube explainer”
Tone Delivery style “Clear, confident, friendly”
Visual style Look and pacing “Modern SaaS demo, clean UI close-ups, bright studio lighting”
Scene list A-roll and B-roll beats “Avatar intro, dashboard B-roll, product close-up, checklist ending”
Camera direction Framing and movement “Medium shot avatar, slow push-in on key point”
Voice style Narration energy “Warm expert, medium pace, subtle emphasis”
Music mood Sonic direction “Light electronic background, upbeat but not distracting”
Call to action Final next step “Invite viewers to start a free trial”

For a fuller breakdown of video tool selection and prompting quality checks, I’d pair this with MagicEditAI’s guide to the AI Video Generator.

Ready-to-Use AI Video Prompts for Common Creator Projects

Here are practical AI video prompts you can adapt right away.

Use case Prompt
YouTube explainer “Create a 3-minute educational video for beginner creators explaining [topic]. Use an expert AI avatar for A-roll, cinematic B-roll for examples, clear captions, warm voiceover, light background music, and a final CTA to subscribe.”
Product demo “Generate a 90-second product demo for [product]. Open with the pain point, show 3 feature scenes with UI-style B-roll, use a confident presenter avatar, add close-up product visuals, and end with a free-trial CTA.”
Online course lesson “Create a 5-minute lesson for [audience] on [skill]. Use a calm instructor avatar, section titles, step-by-step captions, example visuals, and soft focus music under the intro and outro only.”
Social ad “Make a 30-second vertical ad for [offer]. Use fast-paced B-roll, a direct avatar hook in the first 3 seconds, bold visual contrast, energetic narration, and a clear final offer.”
Brand announcement “Create a polished 60-second announcement about [news]. Use a professional avatar, branded background, optimistic tone, subtle music, and B-roll showing customer outcomes.”
Tutorial video “Produce a step-by-step tutorial for [task]. Use avatar A-roll for guidance, screen-recording-style B-roll for each action, numbered captions, and a concise recap.”

Make Avatar Videos Feel Cinematic With B-Roll, Images, Voice, and Music

Avatar-only videos can feel static if every scene is just a presenter speaking into the camera. The fix is simple: treat the avatar as A-roll and build visual rhythm around it.

Use avatar A-roll for:

  • Opening hooks
  • Key explanations
  • Transitions between sections
  • Final CTA moments

Use AI-generated B-roll for:

  • Product close-ups
  • Abstract concept visuals
  • Lifestyle scenes
  • Interface mockups
  • Before-and-after moments
  • Short cinematic clips in a Veo-style format

An AI image editor fits before video generation. I use it to create or refine thumbnails, backgrounds, product shots, scene references, and branded visual assets. For example, before generating a product demo, create a clean hero image, remove messy backgrounds, adjust lighting, then use that image as a reference for B-roll scenes.

Voice matters just as much. With voice cloning, match the narration to the audience: polished for enterprise training, upbeat for creator tutorials, relaxed for community updates. Keep brand consistency by using the same approved voice across recurring content. For localization, generate multilingual versions from the same script structure. And always use consent-based workflows, especially when cloning a real person’s voice.

Then add AI music generation. Don’t just drop in a random stock loop. Generate a short intro sting, a low-volume background bed, transition accents, and a mood-matched outro. Music can make edits feel intentional, especially when the visuals switch between avatar scenes, B-roll, and screen recordings.

A Practical MagicEditAI Workflow From Script to Export

MagicEditAI is built for creators who want one connected content creation workflow, not six disconnected tabs. Here’s the workflow I’d use for a professional multimedia video:

  1. Write the script
    Start with the hook, viewer problem, 3 to 5 teaching points, proof or example, and CTA.

  2. Generate or refine visuals
    Use the image editor for thumbnails, backgrounds, product frames, character references, and scene boards.

  3. Create video scenes
    Build avatar-led A-roll first, then generate B-roll clips for pacing and visual proof.

  4. Clone or generate the voiceover
    Choose the voice style by audience. Keep pronunciation notes for brand names and technical terms.

  5. Add AI music
    Generate intro, background, transition, and outro music that supports the message without overpowering speech.

  6. Edit the final cut
    Trim pauses, add captions, balance audio, insert transitions, and check pacing.

  7. Export platform-specific versions
    Create 16:9 for YouTube, 9:16 for Shorts or Reels, and square cuts for feed placements.

If you want a prompt-first companion, MagicEditAI also has a dedicated guide to Synthesia AI video generator prompts for images, voiceovers, and music.

Is Synthesia AI video free?

Synthesia lists a Basic plan at $0/month and also says users can generate a free AI video from a template and script. Its pricing page currently shows Basic as usable for up to 10 minutes of video per month. (synthesia.io)

How much does Synthesia AI cost?

As of the pricing page I checked, Synthesia lists Starter at $29/month or $264 annually, and Creator at $89/month or $804 annually. The same page also presents annualized monthly pricing from $18/month for Starter and $64/month for Creator when billed yearly. (synthesia.io)

How long can Synthesia videos be?

Plan limits vary. Synthesia’s pricing page says the Starter plan provides 10 video minutes per month, with examples such as ten 1-minute videos or one 10-minute video. The page also references higher limits such as 30 minutes per month and unlimited minutes on other tiers. (synthesia.io)

Dedicated Avatar Platform or All-in-One AI Suite?

A dedicated avatar platform makes sense when your main need is structured presenter content: HR training, compliance videos, sales enablement, internal updates, or multilingual business explainers. If your team needs lots of consistent presenter-led scenes, that focus is valuable.

An all-inclusive set of generative AI tools is better when your creative output changes every week. Product demos need screen scenes. YouTube explainers need visual variety. Social ads need quick resizing. Tutorials need thumbnails, B-roll, captions, voiceovers, and music. That’s where MagicEditAI’s combined video, image, voice, and music workflow gives creators more room to move.

Conclusion

The synthesia ai video generator category is evolving fast. Avatars are still the anchor, but the best videos now combine expressive presenters, cinematic B-roll, edited images, consistent voiceovers, multilingual dubbing, and custom music. My advice is to stop prompting one asset at a time. Prompt the full production: audience, goal, scenes, visuals, voice, music, and CTA.

Try the free trial on MagicEditAI to create your first edited image or AI-generated video.

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