Why is the last line of a paragraph left unchanged?

That matches how justified text works in word processors and typesetting: only lines that wrap to the next one are stretched, while the final line of a paragraph is left ragged so it doesn't get awkwardly stretched to fill the full width.

What happens to a line with only one word?

It's left unchanged, since there's no gap between words to distribute extra spaces into.

What if a line is already longer than the target width?

The words are simply joined with single spaces without adding any extra padding, since there's no room to distribute spaces into.

Text Justifier Online - Even Left & Right Text Edges

Overview

Introduction

Fully justified text, where both the left and right edges of a paragraph line up evenly, is a common look in print and formal documents.

Achieving it in plain text by hand means carefully counting characters and inserting the right number of extra spaces between words on every line.

What Is Text Justifier?

A justifier that distributes extra spaces evenly between the words of each line so the line reaches an exact target width, leaving the last line of each paragraph untouched.

It runs entirely client-side as part of this site's String Tools collection, so nothing you paste is ever uploaded to a server.

How Text Justifier Works

For each line except the last in a paragraph, the tool splits it into words, computes how many extra spaces are needed to reach the target width, and spreads that count as evenly as possible across the gaps between words, giving any remainder to the leftmost gaps.

Paragraphs are detected by blank lines in the input, and the transformation happens synchronously in JavaScript the moment you type.

When To Use Text Justifier

Use it to prepare plain-text output that mimics a justified print layout, format monospace documentation, or create an evenly edged text block for a terminal UI.

It's a fast way to get the answer without opening a code editor, a REPL, or writing a one-off script just to check.

Often used alongside Word Wrapper, Left Aligner and Right Padder.

Features

Advantages

Distributes extra spacing evenly rather than dumping it all in one gap.
Correctly leaves the final line of each paragraph unjustified, matching conventional typography.

Limitations

Lines must already be broken at the desired width; this tool doesn't re-wrap text, only stretches existing lines (pair it with the Word Wrapper tool first).

Examples

Justifying a line to width 20

Input

the quick brown fox

Output

the  quick brown fox

With width=20, one extra space is needed and is added at the first gap, giving each gap between words either one or two spaces so the line reaches exactly 20 characters.

Best Practices & Notes

Best Practices

Run text through a word wrapper first so each line is already close to the target width before justifying, which keeps the extra spacing subtle.

Developer Notes

Paragraphs are split on blank-line boundaries (`/\n\s*\n/`); within each paragraph, every line except the last is justified by computing `baseSpaces = Math.floor(totalSpaces / gaps)` and distributing the `remainder` to the leftmost gaps so spacing differs by at most one space per gap.

Text Justifier Use Cases

Formatting a plain-text document to mimic a print-style justified paragraph
Creating an evenly edged text block for a terminal-based UI
Preparing monospace documentation with clean right-hand margins

Common Mistakes

Applying justification to lines that are much shorter than the target width, which stretches spacing so much the text becomes hard to read.

Tips

Choose a target width close to your longest natural line length to avoid excessive stretching on shorter lines.

Text Justifier