Add Line Breaks

Manually inserting line breaks into large text blocks is tedious and error-prone. A misplaced break corrupts data parsing in CSV files, breaks fixed-width report formatting, and ruins code string literals. This tool inserts line breaks programmatically using four distinct modes: after every N characters (fixed-width wrapping), after every N words (natural language segmentation), before or after a specific delimiter character, or by replacing a target substring. It supports three output break types: literal newline (\n), HTML break tag (<br>), and Windows-style carriage return (\r\n).

The character-interval mode does not split mid-word by default. Word-interval mode preserves existing whitespace. The tool handles edge cases: empty input, intervals of zero, and consecutive delimiters. Note: processing assumes UTF-16 string length (JavaScript default), so surrogate pairs count as 2 characters. For CJK text without spaces, use character mode rather than word mode.

In character-interval mode, the tool calculates insertion points at every Nth character position along the string length L:

In word-interval mode, text is tokenized by whitespace into an array of W words. A break is inserted after every Nth word:

In delimiter mode, the tool scans for each occurrence of character d and inserts the break string either before or after position i where text[i] = d. In replace mode, every occurrence of substring S is replaced with breakStr.

Where N = interval value, L = total string length, W = total word count, d = delimiter character, S = target substring, breakStr = chosen break type string.