Synthesia
AI avatar videos from scripts that generate cleanly, but the tested workflow stayed landscape and export-gated.
Reliable script-to-avatar generation, but not a ready-to-export UGC ad workflow in this test
- You need a straightforward script-in, avatar-out workflow for polished promo videos.
- You are comfortable reviewing output inside the web app before export.
- You can work with a workflow that may gate download or translation behind an upgrade.
- You need guaranteed vertical 9:16 short-form ads.
Our take
Synthesia consistently turned the three supplied product scripts into polished AI-avatar videos with clear voice delivery and consistent lip-sync on a paid credits plan. In the tested workflow, though, the outputs stayed landscape rather than vertical and final download was blocked behind an upgrade, so it was more usable for in-browser review and corporate-style promo work than for immediate short-form ad export.
In-Depth Review
Our detailed analysis of Synthesia — features, performance, and real-world testing.
Feature-by-Feature Breakdown
Script-to-Avatar Video GenerationWorked across all three scripts, but the tested output format was not vertical UGC-ready.▾
Feature tested: Script-to-Avatar Video Generation
Result: Partial
Verdict: Worked across all three scripts, but the tested output format was not vertical UGC-ready.
Expected behavior: Synthesia took supplied product scripts and produced finished AI-avatar videos for the tested FutureSmart AI, Nike Pegasus 41, and Duolingo inputs, including spoken narration and successful completion inside the platform.
Test case: Text prompt → Video file
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Video file): Generated successfully with clear presenter delivery, natural voice, and consistent lip-sync. The test also noted about 32 credits for a 16–17 second video, with landscape output and upgrade-gated download. — Synthesia-FutureSmart AI-output mp4.mp4
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Video file): Generated successfully with clear presenter delivery, natural voice, and consistent lip-sync. The test also noted about 32 credits for a 16–17 second video, with landscape output and upgrade-gated download. — Synthesia-FutureSmart AI-output mp4.mp4
What changed: Text prompt transformed into Video file
Test case: Text prompt → Video file
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Video file): Generated successfully with professional, consistent avatar delivery, strong voice clarity, and accurate lip-sync. The tested workflow still produced landscape video and required an upgrade to download. — Synthesia-Nike Pegasus 41-output mp4.mp4
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Video file): Generated successfully with professional, consistent avatar delivery, strong voice clarity, and accurate lip-sync. The tested workflow still produced landscape video and required an upgrade to download. — Synthesia-Nike Pegasus 41-output mp4.mp4
What changed: Text prompt transformed into Video file
Test case: Text prompt → Video file
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Video file): Generated smoothly with clear, well-paced voice delivery and maintained lip-sync. The output remained landscape, and downloading was not available without upgrading. — Synthesia-Duolingo-output mp4.mp4
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Video file): Generated smoothly with clear, well-paced voice delivery and maintained lip-sync. The output remained landscape, and downloading was not available without upgrading. — Synthesia-Duolingo-output mp4.mp4
What changed: Text prompt transformed into Video file
Why it matters / Conclusion: Reliable generation across three normal promo scripts, but the tested outputs were landscape 16–17 second videos rather than short-form vertical ads.
Synthesia took supplied product scripts and produced finished AI-avatar videos for the tested FutureSmart AI, Nike Pegasus 41, and Duolingo inputs, including spoken narration and successful completion inside the platform.
Avatar Library and Presenter SelectionPresenter selection was available through a browsable avatar library.▾
Feature tested: Avatar Library and Presenter Selection
Result: Passed
Verdict: Presenter selection was available through a browsable avatar library.
Expected behavior: The avatar picker provided a searchable presenter library with filters like All Avatars, My Avatars, Shared with me, Recent, Brand kit, and Custom Avatars, along with presenter thumbnails for choosing a presenter.
Test case: Text prompt → Image
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Image): The avatar picker displayed multiple selectable presenters and categories, including All Avatars, My Avatars, Shared with me, Recent, Brand kit, and Custom Avatars. — synthesia-avatar-library.png
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Image): The avatar picker displayed multiple selectable presenters and categories, including All Avatars, My Avatars, Shared with me, Recent, Brand kit, and Custom Avatars. — synthesia-avatar-library.png
What changed: Text prompt transformed into Image
Why it matters / Conclusion: The presenter library is easy to browse, but this report did not verify separate voice-library breadth or an avatar swap inside a finished ad.
The avatar picker provided a searchable presenter library with filters like All Avatars, My Avatars, Shared with me, Recent, Brand kit, and Custom Avatars, along with presenter thumbnails for choosing a presenter.
In-Editor Preview and PlaybackPreviewing worked inside the workspace.▾
Feature tested: In-Editor Preview and Playback
Result: Passed
Verdict: Previewing worked inside the workspace.
Expected behavior: Synthesia let the tester review generated videos inside the workspace before export, so the result could be inspected without leaving the editor.
Test case: Text prompt → Image
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Image): Output — synthesia-script-input.png
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Image): Output — synthesia-script-input.png
What changed: Text prompt transformed into Image
Why it matters / Conclusion: Previewing is available and worked as expected, but the report did not test deeper edits or refinement beyond review.
Synthesia let the tester review generated videos inside the workspace before export, so the result could be inspected without leaving the editor.
Export and Translation ControlsExport and translation actions were visible, but gated on the tested account.▾
Feature tested: Export and Translation Controls
Result: Partial
Verdict: Export and translation actions were visible, but gated on the tested account.
Expected behavior: The version menu exposed download options for MP4 and caption files plus a Translate action, though the tested account showed upgrade gating for download and translation.
Test case: Text prompt → Image
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Image): The version menu showed export choices for video and captions files, but downloading the generated video required an upgraded plan. — synthesia-download-restriction.png
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Image): The version menu showed export choices for video and captions files, but downloading the generated video required an upgraded plan. — synthesia-download-restriction.png
What changed: Text prompt transformed into Image
Test case: Text prompt → Image
Input type: Text prompt
Input used: Input artifact (Text prompt): Input
Observed output: Output artifact (Image): The video workspace exposed Translate in the version menu, but the tested workflow indicated that the action required an upgrade. — synthesia-translate-option.png
Input artifact: Input artifact (Text prompt): Input
Output artifact: Output artifact (Image): The video workspace exposed Translate in the version menu, but the tested workflow indicated that the action required an upgrade. — synthesia-translate-option.png
What changed: Text prompt transformed into Image
Why it matters / Conclusion: The product surfaces export and language workflows, but the tested plan could not complete them.
The version menu exposed download options for MP4 and caption files plus a Translate action, though the tested account showed upgrade gating for download and translation.
How it scored on the research's own criteria
The 10 evaluation dimensions from our hands-on research on Synthesia, each judged from recorded runs on 3 test inputs — the same verdicts the ranking page ranks on.
held up partial failed not exercised by this input
| Criterion | Verdict | What the runs showed | Per input | Proof |
|---|---|---|---|---|
| Ad-readiness | Weak1/5 | It could preview a finished cut, but the locked download step keeps the output from being ready to hand off as a paid ad at the tested access level. | open proof ↗ | |
| Avatar realism | Strong5/5 | Across all three tests, the presenter looked stable and the mouth movement tracked the speech well, so there was no sign of uncanny or broken delivery. | open proof ↗ | |
| Caption quality | Mixed | Captions were not actually used in the tested workflow, so there’s no direct basis for judging accuracy, timing, readability, or social-ad styling. | — | |
| Product understanding | Mixed | The tool was not checked for whether it truly understood each product’s features, audience, or positioning, so there isn’t enough direct evidence to rate that skill. | — | |
| Script quality & persuasiveness | Weak2/5 | The scripts were spoken clearly, but they kept coming off polished and corporate instead of feeling like a believable creator recommendation, which hurts ad persuasion. | open proof ↗ | |
| Voice quality | Strong5/5 | The spoken delivery sounded natural, stayed easy to follow, and matched the avatar well enough that the voice felt like a real presenter rather than a synthetic afterthought. | open proof ↗ | |
| Avatar/voice/language library | Mixed3/5 | The avatar selection looks broad and usable, but the language and voice breadth were not fully proven because the relevant settings were blocked behind an upgrade. | open proof ↗ | |
| Cost & speed | Strong4/5 | The cost is concrete and the generation finished successfully, but the speed side was not measured closely enough to give it a perfect score. | — | |
| Editing/refinement | Mixed | The workflow did not actually test changing the script, avatar, voice, captions, or hook after generation, so there’s no direct proof that ads can be refined without rebuilding them. | — | |
| Platform formats | Weak1/5 | Every tested output came out in landscape, so the tool missed the basic format requirement for vertical short-form ads. | open proof ↗ |
Verdicts come verbatim from the study's recorded observations, never re-derived at render; a criterion with no recorded run shows Not exercised — this section cannot invent a score.
Featured in Rankings
Independent rankings where Synthesia was tested and rated.
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