文字数カウンター is a free Chrome browser add-on developed by mountaindull. This add-on allows users to count the number of characters in selected text. It provides counts for "total characters," "characters excluding spaces," "number of words," and "number of unique words." This add-on supports both Japanese and English texts, making it versatile for users in different languages.

With 文字数カウンター, users can easily keep track of the length of their text selections. Whether it's for writing essays, blog posts, or social media updates, this add-on provides a convenient way to check the character count. It also offers additional insights by excluding spaces and counting the number of words and unique words. This can be particularly useful for writers who need to meet specific character limits or analyze the vocabulary diversity in their texts.

Overall, 文字数カウンター is a helpful tool for Chrome users who want to accurately count the characters in their selected text. Its support for both Japanese and English texts makes it suitable for a wide range of users.