Synthesia API scripts support a set of HTML-like tags that let you control timing and pronunciation in generated videos.

Quick Reference

Tag	Purpose	Example
`<break>`	Insert a pause	`Hello <break time="2s"/> world`
`<sub>`	Control pronunciation	`<sub alias="Syn-the-zia">Synthesia</sub>`

Insert Pauses with `<break>`

Use the <break> tag to add pauses or delays in narration:

Syntax:

<break time="1s"/>

Example:

Hello <break time="2s"/> world

Use the <sub> tag to make the avatar say one word while displaying another as on-screen text:

Syntax:

<sub alias="spoken text">caption text</sub>

Example:

The word is <sub alias="Syn-the-zia">Synthesia</sub>