Prefix / Suffix Lines

How the Prefix / Suffix Lines Tool Works

What the Tool Does

The prefix and suffix lines tool adds custom text to the beginning and end of every line in a block of text simultaneously. Paste in any multi-line content, enter a prefix string, a suffix string, or both, and the output is updated live. A "Skip empty lines" toggle prevents blank separator lines from being wrapped. This makes it the fastest way to bulk prepend or append text to every line without a text editor or scripting.

Common Developer Use Cases

Use this tool to convert a plain list of values into SQL IN clauses by adding a prefix of '' and a suffix of '',. Wrap every line in double quotes for CSV generation, or add a comment marker like "// " to comment out a block of code lines. Front-end developers use it to convert a list of class names into JSX className strings, and infrastructure engineers use it to prepend hostnames with environment prefixes like "prod-". The skip-empty-lines option keeps paragraph spacing intact when bulk-formatting prose.

Data Formats and Variants

Any newline-delimited text is supported: plain text files, CSV rows, JSON array items, Markdown lists, log lines, SQL values, and code blocks. The tool preserves the original line endings and handles Windows (CRLF), Unix (LF), and classic Mac (CR) line endings transparently. Prefix and suffix fields accept any characters including spaces, symbols, and Unicode, so you can add emoji, HTML tags, or multi-character delimiters.

Common Pitfalls and Edge Cases

Remember that the prefix and suffix are applied literally — special regex or template characters have no special meaning here. If you paste text that already has trailing spaces, those become part of the line before the suffix is added. When generating SQL or code snippets, double-check that the last line does not end with a trailing comma or semicolon if the target syntax does not allow it. Use the "Skip empty lines" option to avoid producing lines that contain only punctuation from the prefix/suffix.

When to Use This Tool vs Code

Use this browser tool for quick one-off transformations during development, code review, or data preparation. For repeatable automation in CI pipelines, prefer sed, awk, or a short script: in bash, sed 's/^/prefix/;s/$/suffix/' file.txt or in Python, '\n'.join(f'{p}{line}{s}' for line in text.splitlines()). Use the browser tool when you need instant visual feedback and do not want to open a terminal.