Capitalize first letter of each word with liquid syntax?

There is a way to achieve this using only Liquid syntax. No need for any plugins.

Break down your string of words into an array and use a for loop combined with the capitalize filter to capitalize the first letter of each word. If you appropriately encapsulate this inside a capture statement you are left with the first character in every word capitalized.

{% assign words = "Hi, how are you today?" | split: ' ' %}

{% capture titlecase %}
  {% for word in words %}
    {{ word | capitalize }}
  {% endfor %}{% endcapture %}
{{ titlecase }}

Output:

Hi, How Are You Today?

Notice that all of this is on a single line and there is only one occurrence of whitespace within the entire capture statement!

I would suggest to use a plugin to obtain this behavior

_plugins/_capitalize_all.rb:

require 'liquid'
require 'uri'

# Capitalize all words of the input
module Jekyll
  module CapitalizeAll
    def capitalize_all(words)
      return words.split(' ').map(&:capitalize).join(' ')
    end
  end
end

Liquid::Template.register_filter(Jekyll::CapitalizeAll)

Usage:

{{ "mein text" | capitalize_all }}

how about setting this up with CSS ?

title {
    text-transform:capitalize;
}

edit: i did a typo about text-transform, now it is fixed;