hugo/docs/content/en/functions/truncate.md

title	description	godocref	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated
truncate	Truncates a text to a max length without cutting words or leaving unclosed HTML tags.		2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	strings	truncate SIZE INPUT truncate SIZE ELLIPSIS INPUT		19		false

Since Go templates are HTML-aware, truncate will intelligently handle normal strings vs HTML strings:

{{ "<em>Keep my HTML</em>" | safeHTML | truncate 10 }}` → <em>Keep my …</em>`

{{% note %}} If you have a raw string that contains HTML tags you want to remain treated as HTML, you will need to convert the string to HTML using the safeHTML template function before sending the value to truncate. Otherwise, the HTML tags will be escaped when passed through the truncate function. {{% /note %}}