Compared to left-aligned text, justification gives text a cleaner, more formal look. Justification works by adding white space between the words in each line so all the lines are the same length. This alters the ideal spacing of the font, but in paragraphs of reasonable width it's usually not distracting.

When should you use justify text?

Justified text is commonly used in printed media such as newspapers, book, leaflets etc where the straight line on each margin can be used successfully to guide the eye across columns of text. Newspapers are a great example of justified text used successfully.

Why justify text is bad?

Justifying text disrupts that even texture. Even if a page layout program is using subtle letter-spacing, or adjusting the width of the letters – these things, too, will make the texture uneven. So, justified text should really be avoided not just on the web, but whenever possible.