Prompt variables

With an AI provider, every translation request sends a system prompt and a prompt. You can pick one of the built-in prompts or write your own on Page Translation → Customize page prompts (and Video Subtitles → Custom subtitle prompts for subtitles). Click Copy and customize on a built-in prompt to start from it.

In both fields, variables in double curly braces are replaced before the request goes out.

Page translation

Variable	Becomes
{{input}}	The text to translate
{{targetLanguage}}	Your target language
{{webTitle}}	The page title
{{webDescription}}	The page’s description from its metadata
{{webContent}}	The page’s text, cut to the first 2,000 characters
{{webSummary}}	A summary of the page, when AI smart context translation is on

Video subtitles

Variable	Becomes
{{input}}	The subtitle text to translate
{{targetLanguage}}	Your target language
{{webTitle}}	The page title, usually the video’s title
{{webDescription}}	The page’s description from its metadata
{{videoSummary}}	A summary of the video, when AI smart context translation is on

Example

Translate the following text into {{targetLanguage}}.
It comes from an article titled "{{webTitle}}".
Keep technical terms in English. Reply with the translation only.

{{input}}

Tips

• Keep {{input}} in the prompt; without it there’s nothing to translate.
• Several paragraphs often travel in one request, separated by a line with %%. Duet Translate adds the rules for that to the system prompt by itself, so your prompt only has to describe the translation you want.
• {{webContent}} and {{webSummary}} make each request longer, so they cost more tokens.
• Export and Import move prompts between browsers or share them with others.