How to Remove Blank Lines from Text or a List

A list or document padded with blank lines — gaps between every entry, empty lines from a paste — is longer and harder to work with than it needs to be. Removing them sounds trivial, but there is a catch: some "blank" lines are not actually empty, and simple tools leave them behind. Here is how to strip every blank line, including the sneaky ones.

Where blank lines come from

Empty lines accumulate whenever text passes through different formats. Copying from a PDF often inserts a blank line after every visual line, doubling the length. Exporting from a spreadsheet leaves gaps where cells were empty. Pasting from email or chat brings extra spacing. Manually formatted text has blank lines for visual separation that you may not want when processing the data. The result is text cluttered with empty lines that make it longer and messier than the actual content requires.

Truly empty vs whitespace-only lines

Here is the catch that trips up simple tools. A truly empty line contains nothing at all. But many lines that look empty actually contain invisible spaces or tabs — they render as blank but are not technically empty. A basic "remove blank lines" function only catches the truly empty ones and leaves the whitespace-only lines behind, so your text still looks gapped after you thought you cleaned it. The fix is a tool that treats a line containing only spaces or tabs as blank and removes it too.

Cleaning PDF and export text

The most common reason to remove blank lines is text copied from a PDF, which frequently has an empty line after every line of content. Removing the empties restores continuous, readable text. The same applies to data exported from spreadsheets or reports with gaps. For a complete cleanup, pair blank-line removal with removing extra line breaks — to rejoin broken paragraphs — and removing extra spaces, to normalize whitespace. Those steps together turn messy pasted text into clean content.

When to keep some blank lines

Not every blank line is unwanted. Blank lines between paragraphs provide structure and readability, and you usually want to keep those. The goal is removing the excess — the doubled and tripled empties, the gaps between every single line — not flattening everything into one block. Some tools let you collapse runs of multiple blank lines into a single blank line, which removes the excess while preserving paragraph separation. Choose the option that matches whether you want zero blank lines or just no excessive ones.