API
Improvement

Dub videos at scale with the Localization API

Dub videos into up to 20 languages straight from your own systems with the new Localization API, built for localization at scale.

See what Synthesia can do for you

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If you localize a lot of video, dubbing one video at a time doesn't scale. With the new Localization API, you can dub videos automatically from your own CMS, LMS, or content pipeline.

What's new

  • Create a localization from a video URL and dub it into up to 20 languages in one request
  • Follow each language until its dubbed video is ready
  • Add more languages to an existing localization later
  • Check which source and target languages are supported
  • Control access with new Localization (read) and Localization (write) API key scopes

To get started, create an API key with Localization (write) in Developers → API keys.

For more on how it works, check out our documentation.

More updates

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Enterprise

Create Syren videos with your Brand Kits

Pick one of your workspace's Brand Kits in Syren, and your videos use its logos, colors, fonts, and Avatars from the very first draft.

10/27/26
Enterprise

Manage and secure your team's API keys

See and control every member's API keys from Settings, and have keys disabled automatically when someone leaves your workspace.

10/23/26
Voices

Read text more accurately with stock voices

Stock voices now better read numbers, dates, symbols, abbreviations, and units in your scripts, helping you create accurate voiceovers across locales.

10/23/26