Our verdict

This Synthesia review covers the London-based platform that turns a written script into a video presented by a realistic AI avatar. You type or upload a script, choose an avatar and a voice, and Synthesia generates the presenter, lip-synced, in a scene you can edit like a slide deck. It is aimed squarely at businesses: training, onboarding, internal communications, product explainers and sales enablement, in many languages, without cameras, studios or actors.

Synthesia is the most enterprise-ready tool in our AI video comparison. It holds a long list of security and AI governance certifications, has a published consent policy for avatars and moderates content at the point of creation. Independent reviewers praise how easy it is to use and how good the lip sync looks, and criticise the avatars for lacking warmth, the voices for flat delivery on long scripts, the cost of scaling up, and moderation decisions that are not always explained.

NerdBible did not produce videos on Synthesia for this review. It is an editorial assessment built from Synthesia's own product, pricing, ethics and policy pages, independent reviews and customer review platforms.

What is Synthesia and who is it for?

Synthesia is a browser-based AI video platform. Its homepage says it has more than 2 million users and is used by most of the Fortune 100. It describes stock avatars, personal avatars made from a photo or a short recording, voiceovers in more than 140 languages, translation and dubbing with lip sync, PowerPoint-to-video conversion, screen recording, interactive elements such as quizzes and branching, and real-time interactive avatars through an API. Newer products include roleplay sessions, where learners practise a conversation with an avatar that responds and gives feedback.

It suits:

  • Learning and development teams producing training and compliance videos that need regular updates.
  • Global companies that want the same message in many languages.
  • Security-conscious organisations that need certifications, single sign-on and governance documentation before they can buy.

It suits less well creators who want emotional, personality-driven video, anyone who needs a general video editor for their own footage, and advertisers who want stock avatars in paid social ads, which its policy restricts.

Key features

Avatars: stock, personal and studio

Synthesia offers a library of stock avatars based on real actors who, the company says, consented and are paid. Its help article on custom avatars describes personal avatars, created at home from a single photo or a video recording, and studio avatars, filmed professionally or recorded to a higher standard, as a paid add-on that takes days to process. Avatars must be based on real human footage and cannot be exported on their own; they exist only inside Synthesia and appear in finished videos.

Languages, translation and dubbing

Multilingual output is Synthesia's best-known strength. You can generate a video directly in another language or translate an existing one, with lip-synced dubbing on higher plans. Synthesia's own pages quote different language totals depending on the feature, so check that your specific languages are supported for the feature you need.

Editor, templates and collaboration

The editor works scene by scene, much like building a presentation. You can change backgrounds, layouts, fonts, music and media, start from templates, and work with colleagues on the same project. Reviewers describe it as easy to learn, though not a replacement for a full video editor.

Interactivity and analytics

Quizzes, calls to action and branching scenarios turn videos into lightweight learning modules, and viewing analytics show how far people watch.

How much does Synthesia cost?

Our comparison table shows current pricing from our data, so here is the structure. The pricing page lists four plans. A free Basic plan gives a small monthly allowance of video creation or dubbing, with a watermark. Starter removes the watermark and allows downloads. Pro, the plan most teams look at, adds personal avatars, a larger stock avatar library and one-click translation. Enterprise adds unlimited video minutes and personal avatars, SAML single sign-on, live collaboration and a dedicated customer success manager.

Paid plans run on credits, with monthly and annual billing; annual billing costs noticeably less per month and grants credits for the year. Roleplay seats and studio avatars are paid add-ons. Customer reviews note that on monthly plans unused credits do not roll over, which matters if your production is irregular.

Is Synthesia safe and ethical to use?

Synthesia's ethics page sets out a framework it calls Review, Report and React: risk assessment before launch, provenance and accountability for content, and moderation and incident response afterwards. It says moderation happens at the point of creation rather than after publication, that avatars require consent, and that it was the first generative AI company certified to ISO 42001, the AI management standard. The homepage lists SOC 2 Type II, ISO 27001 and ISO 27701 certifications, GDPR compliance and EU data residency options.

The acceptable use policy is detailed. It requires business use, bans impersonation intended to deceive, prohibits using outputs as the basis for hiring, promotion or education decisions, forbids removing provenance watermarks, and bars stock avatars from paid social advertising without written consent. It also prohibits making a stock avatar appear to personally hold views or conditions, except on enterprise plans. For most corporate users these rules are sensible; for marketers, they are a real constraint.

What could be better

  • Avatars that feel corporate. Several reviewers find them stiff and emotionally flat, fine for training but weak for storytelling.
  • Voice delivery. Long narrations can sound robotic, and specialist terms are sometimes mispronounced.
  • Opaque moderation. Some customers report scripts rejected without a clear reason, which can stall a deadline.
  • Cost at scale. Credits, seats and add-ons add up for larger teams.
  • Limited editing. It is not a general video editor, and you cannot edit your own footage in depth.

Who should choose something else

If you want personality-driven video for social media, a human presenter or a creator-focused tool will connect better with an audience. If you need full editing control over filmed footage, a traditional video editor is the right tool. If you plan paid social ads with an avatar, check the licensing rules first or use a custom avatar of someone who has consented. And if you need only a few short videos a year, the free plan or a cheaper rival may be enough.

How teams get the most from Synthesia

The reviews we read point to a few habits that separate teams who are happy with Synthesia from those who are not.

  • Write for the ear, not the page. Avatar voices handle short, plain sentences far better than long, technical paragraphs. Several customers complain about flat delivery on long scripts; shorter scenes and simpler wording reduce the problem.
  • Build a pronunciation list early. Product names and jargon are where mispronunciation shows up. Fixing them once and reusing them saves rework across a library of videos.
  • Use templates and brand settings. Consistent layouts make a large training library look deliberate and make updates quick.
  • Plan for moderation. Scripts are checked before rendering. If your subject matter is sensitive, such as health, finance or security topics, allow time for review and keep wording factual.
  • Match the plan to your production rhythm. If you produce in bursts, annual credits avoid the monthly use-it-or-lose-it problem that some reviewers describe.

Synthesia's biggest advantage over filming is that a video can be updated by editing text. Teams that treat their videos as living documents, revised when a policy or product changes, get far more value than teams that use it for one-off pieces.

Bottom line

Synthesia is the safe enterprise choice for avatar video. It is easy to use, strong on languages, well documented on security and unusually serious about consent and moderation. Its avatars will not replace a charismatic human presenter, its moderation can frustrate, and its costs rise with your ambitions. For training, onboarding and multilingual business communication, it is one of the best tools available.

What other reviewers found

  • eWeek found the editor easy to learn and the lip sync convincing, praised customisation and templates, but described the avatars as cold and corporate and said minute limits make heavy use expensive.
  • TechRadar Pro, in an explainer rather than a full review, called it a strong choice for businesses producing training and internal video at scale, and noted it is not a general video editor and that its voices lack the expressiveness of a human narrator.
  • Users on Capterra rate it 4.6 out of 5 across more than 300 reviews, praising speed and multilingual avatars, while citing inconsistent moderation, limited editing and costs that climb as teams grow.
  • Reviewers on Trustpilot give it 3.8 from more than 1,800 reviews: most praise ease of use and helpful onboarding, while critics focus on price, content rejections and credits lost at the end of a month.

Where they agree: Synthesia is easy to use, its multilingual output is a genuine strength, and its avatars are realistic in appearance but short on warmth. Where they differ: on value. Enterprise-minded outlets see the price as reasonable against the cost of filming; individual users comparing it with cheaper rivals feel overcharged. For buyers, the deciding question is what you would otherwise spend: against a film crew, Synthesia is cheap; against another AI tool, it is a premium you pay for governance and polish.

Frequently asked questions

Is Synthesia free to use?

Synthesia has a free Basic plan with a small monthly allowance of video creation or dubbing, and videos carry a Synthesia watermark. Paid plans remove the watermark, allow downloads and add more credits, avatars and features such as personal avatars and one-click translation. Enterprise adds single sign-on, unlimited minutes and a dedicated customer success manager.

Can I make an AI avatar of myself with Synthesia?

Yes. Synthesia offers personal avatars created from a single photo or a short video recording, and studio avatars filmed to a higher standard as a paid add-on. It requires explicit consent from the person whose likeness is used, so you cannot make an avatar of someone else without their permission. Avatars stay inside Synthesia and cannot be exported on their own.

Is Synthesia safe for company data?

Synthesia says it holds SOC 2 Type II, ISO 27001, ISO 27701 and ISO 42001 certifications, complies with GDPR and offers EU data residency. Its acceptable use policy and ethics framework describe consent rules for avatars and moderation at the point of creation. Enterprise customers can add SAML single sign-on. Your security team should still review its documentation against your own requirements.

Can I use Synthesia avatars in ads?

With limits. Synthesia's acceptable use policy bars stock avatars from promoted, boosted or paid social media advertising without written consent from Synthesia. A custom avatar of someone who has given appropriate consent can be used. The policy also bans deceptive impersonation and age-restricted advertising, so read it before planning a marketing campaign around an avatar.

Is Synthesia worth it?

For businesses producing training, onboarding or multilingual communication at volume, reviewers broadly say yes, because it replaces filming and voiceover costs and is easy to learn. For creators who need emotional, personality-led video, or for occasional users, cheaper or different tools may be a better fit. The free plan is a low-risk way to judge the avatars and voices yourself.

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