Replace Line Breaks in Text

The Replace Line Breaks tool lets you instantly swap every newline character in your text with any character, word, or string you choose. Whether you need to collapse a multi-line list into a comma-separated value, join paragraphs with a pipe delimiter, or flatten text into a single continuous line for a form field or API payload, this tool handles it in seconds. Paste your text, define your replacement string, and get clean output ready to copy. It correctly handles all common line ending formats — Unix (LF), Windows (CRLF), and older Mac (CR) — so you never have to worry about hidden characters causing unexpected results. This tool is especially valuable for developers preparing data for JSON strings, database imports, or command-line arguments, as well as for writers and analysts who need to reformat exported content from spreadsheets, word processors, or log files. No installation, no scripting, no regex knowledge required — just paste, configure, and copy. It works entirely in your browser, meaning your text never leaves your device, making it safe to use with sensitive or confidential content.

Input
Options
Set a new line break symbol.
Output

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What It Does

The Replace Line Breaks tool lets you instantly swap every newline character in your text with any character, word, or string you choose. Whether you need to collapse a multi-line list into a comma-separated value, join paragraphs with a pipe delimiter, or flatten text into a single continuous line for a form field or API payload, this tool handles it in seconds. Paste your text, define your replacement string, and get clean output ready to copy. It correctly handles all common line ending formats — Unix (LF), Windows (CRLF), and older Mac (CR) — so you never have to worry about hidden characters causing unexpected results. This tool is especially valuable for developers preparing data for JSON strings, database imports, or command-line arguments, as well as for writers and analysts who need to reformat exported content from spreadsheets, word processors, or log files. No installation, no scripting, no regex knowledge required — just paste, configure, and copy. It works entirely in your browser, meaning your text never leaves your device, making it safe to use with sensitive or confidential content.

How It Works

Replace Line Breaks in Text swaps one pattern, character set, or representation for another. The interesting part is not just what appears in the output, but how consistently the replacement is applied across mixed input.

Replacement logic usually follows the exact match rule the tool expects. Small differences in case, punctuation, or surrounding whitespace can explain why one segment changes and another does not.

All processing happens in your browser, so your input stays on your device during the transformation.

Common Use Cases

  • Converting a multi-line list of names or items into a comma-separated string for use in a SQL IN clause or spreadsheet formula.
  • Replacing newlines with pipe characters to prepare text for a CSV or TSV import where a column contains multi-line data.
  • Flattening a block of addresses or records into a single line so it can be pasted into a single-line input field or configuration file.
  • Joining lines with a space to reconstruct a paragraph that was broken across lines during copy-paste from a PDF or document.
  • Replacing line breaks with \n literal strings before embedding multi-line text inside a JSON value or JavaScript string.
  • Preparing log output or terminal results for inclusion in a Slack message, email, or ticket system that strips formatting.
  • Converting a newline-delimited word list exported from a tool into a semicolon-separated list for another application's import format.

How to Use

  1. Paste or type your multi-line text into the input box — this can be a list, a paragraph block, log output, or any text with line breaks.
  2. Enter the replacement string in the separator field. Leave it empty to remove all line breaks entirely, or type a comma, space, pipe, semicolon, or any custom string you need.
  3. Click the replace or convert button to process the text. All line breaks — including Windows CRLF and Unix LF endings — will be substituted with your chosen string.
  4. Review the output in the result box to confirm the formatting looks correct, especially if your input had mixed line ending types.
  5. Click the copy button to copy the converted text to your clipboard, ready to paste wherever you need it.

Features

  • Supports any replacement string — single characters like commas or spaces, multi-character delimiters like ' | ' or ', ', or even full words.
  • Detects and handles all three line ending formats: LF (Unix/Linux/Mac), CRLF (Windows), and CR (legacy Mac) — no manual preprocessing needed.
  • Option to remove line breaks entirely by leaving the replacement field blank, producing a single unbroken string.
  • Processes large blocks of text instantly in the browser without sending data to a server, keeping sensitive content private.
  • Preserves all other whitespace and punctuation in your text — only newline characters are affected by the replacement.
  • Simple, distraction-free interface designed for speed — paste, configure, copy in under ten seconds.
  • No account, login, or installation required — available instantly in any modern browser on desktop or mobile.

Examples

Below is a representative input and output so you can see the transformation clearly.

Input
alpha
beta
gamma
Output
alpha | beta | gamma

Edge Cases

  • Very large inputs can still stress the browser, especially when the tool is working across many lines. Split huge jobs into smaller batches if the page becomes sluggish.
  • Overlapping patterns and global replacements can produce broader changes than expected, so preview a small sample before full input.
  • If the output looks wrong, compare the exact input and option values first, because Replace Line Breaks in Text should be repeatable with the same settings.

Troubleshooting

  • Unexpected output often means the input is being split or interpreted at the wrong unit. For Replace Line Breaks in Text, that unit is usually lines.
  • If a previous run looked different, check for hidden whitespace, changed separators, or a setting that was toggled accidentally.
  • If nothing changes, confirm that the input actually contains the pattern or structure this tool operates on.
  • If the page feels slow, reduce the input size and test a smaller sample first.

Tips

When preparing text for JSON or JavaScript strings, replace line breaks with the literal two-character sequence \n (backslash + n) rather than an actual newline, so the string remains valid in code. If your output looks like words are running together after replacement, try using a space or a comma-space combination (', ') as your separator rather than just a comma. For data coming from Windows applications, always verify the output — Windows files often use CRLF line endings, and a tool that only strips LF may leave stray carriage return characters (\r) in your result. If you need to go the other direction — splitting a single-line string back into multiple lines — look for a companion split or line-break insertion tool.

Line breaks are one of the most underappreciated sources of formatting friction in everyday text work. They're invisible, they behave differently across operating systems, and they have a way of breaking things in the most inconvenient moments — a database query that fails because a copied value contained a hidden newline, a JSON file that won't parse because a string spans multiple lines, or a spreadsheet formula that returns an error because a cell value has an embedded line feed. Understanding how line breaks work and how to control them is a genuinely useful skill. At the character level, a line break can be represented in three ways. Unix and Linux systems (including modern macOS) use a single Line Feed character, written as LF or \n (ASCII code 10). Windows uses a two-character sequence: a Carriage Return followed by a Line Feed, written as CRLF or \r\n. Older classic Mac systems used a lone Carriage Return, CR or \r (ASCII code 13). When text travels between systems — through copy-paste, file transfers, or API responses — it can pick up mixed line endings that cause subtle, hard-to-diagnose problems. A robust line break replacement tool normalizes all three formats before processing, ensuring consistent results regardless of where your text originated. The most common real-world use case is transforming vertical lists into horizontal, delimited strings. Think about a situation where you export a column from Excel — you get one item per line. But the system you're importing into expects a comma-separated list in a single field. A few seconds with a line break replacement tool converts that export instantly, without writing a script or opening a code editor. Developers encounter this problem constantly when working with strings in code. JSON, for example, does not allow literal newlines inside string values — they must be escaped as \n. If you paste multi-line text directly into a JSON value, the file becomes invalid. By replacing actual newline characters with the escaped literal \n before embedding the text, you produce a valid JSON string that any parser can handle correctly. Another common scenario is working with text extracted from PDFs. PDF-to-text conversion frequently introduces arbitrary line breaks in the middle of sentences — a paragraph that was reflowed to fit the page ends up with a line break after every 80 or so characters. Replacing those newlines with spaces instantly restores the paragraph to readable, continuous prose, which you can then paste into a document or editor without manual cleanup. Compared to using a text editor's find-and-replace feature, an online line break tool has one practical advantage: it handles the special characters for you. Entering a literal newline into most find-and-replace dialogs requires knowing to type \n or use a keyboard shortcut — a small friction point that trips up non-technical users. A dedicated tool makes the operation self-explanatory and accessible to anyone. For power users who do this frequently, learning the equivalent regex — replacing /\r\n|\r|\n/g with your separator — is worth knowing for use in code editors like VS Code or in scripting languages like Python, JavaScript, or sed. But for one-off conversions, a browser-based tool is almost always faster.

Frequently Asked Questions

What is a line break and why does replacing it matter?

A line break is an invisible character (or pair of characters) that signals the end of one line and the beginning of the next in a text file. Different operating systems use different line break formats: Unix/Mac uses LF (\n), Windows uses CRLF (\r\n), and classic Mac used CR (\r). Replacing line breaks matters because many systems — JSON parsers, single-line input fields, SQL queries, and CSV formats — cannot handle raw newlines inside a value and will either break or produce unexpected results. Converting newlines to a safe delimiter like a comma or space makes your text compatible with these systems.

How do I replace line breaks with a comma and space?

Paste your multi-line text into the input field, then type a comma followed by a space (', ') in the replacement field. When you click convert, every line break will be replaced with ', ', turning your list into a properly formatted comma-separated string. This format is ideal for SQL IN clauses, readable lists in documents, or any context where you want visual separation between items.

Can I remove all line breaks entirely to make one continuous line?

Yes. Simply leave the replacement field blank and click convert. The tool will delete every newline character in your text, joining all lines together into a single unbroken string. This is useful for pasting text into single-line fields, reducing whitespace in data, or preparing strings for certain API parameters that don't accept multi-line input. If words run together after removal, consider using a single space as your replacement instead.

Does this tool handle Windows (CRLF) line endings as well as Unix (LF) endings?

Yes. The tool detects and replaces all standard line ending formats: Windows CRLF (\r\n), Unix/Linux/macOS LF (\n), and legacy Mac CR (\r). This is important because text copied from Windows applications often contains CRLF endings, and a tool that only strips LF would leave orphaned \r characters behind — invisible in most editors but potentially causing issues in code or data processing. Handling all three formats ensures clean, consistent output regardless of where your text came from.

How do I replace line breaks to embed text inside a JSON string?

JSON strings cannot contain literal newline characters — the JSON specification requires them to be escaped. To embed multi-line text in a JSON value, replace each line break with the two-character sequence \n (a backslash followed by the letter n). Enter \n as your replacement string in the tool, and the output will be a single-line string with escaped newlines that any JSON parser will accept. Be careful not to confuse this with an actual newline character — you want the literal characters \ and n in your output.

What's the difference between replacing line breaks with this tool versus using find-and-replace in a text editor?

Most text editors can replace line breaks using their find-and-replace feature with regex mode enabled, typically by searching for \n or \r\n. However, enabling regex, typing the correct escape sequence, and handling mixed line endings requires some technical knowledge and varies between editors. This browser-based tool handles all of that automatically, making the operation accessible to non-technical users and faster for anyone who just needs a quick conversion without opening an editor or writing a script.

Is my text kept private when I use this tool?

Yes. The replacement is performed entirely in your browser using JavaScript — your text is never sent to a server or stored anywhere. This makes it safe to use with confidential data such as internal documents, customer records, or proprietary code. Since there's no server involved, the tool also works offline once the page has loaded.

Can I replace line breaks with multiple characters or a word?

Absolutely. The replacement string can be any sequence of characters — a single comma, a space, a pipe character, a tab, a multi-character delimiter like ' | ' or ' > ', or even a full word like ' AND '. The tool replaces every line break with exactly the string you provide, giving you full control over the output format. This flexibility makes it useful for a wide range of data transformation tasks beyond simple list conversion.