Remove Empty Lines

How to use

1. 1.Paste text containing blank rows.
2. 2.Keep the whitespace-only option enabled for visual blanks, or disable it to remove zero-length lines only.
3. 3.Process the text and verify the removed and retained counts.

About Remove Empty Lines

Remove Empty Lines filters blank rows from pasted plain text while preserving every retained line's content. Paste prose, a list, configuration, code, or exported values, decide whether whitespace-only rows count as empty, and generate a compact result in the browser. The summary reports how many input lines were removed and retained. Nothing is uploaded, stored, or sent to an external API.

With the whitespace option enabled, a line is removed when JavaScript trimming leaves it empty. This includes an ordinary empty line and lines containing only recognized whitespace such as spaces, tabs, non-breaking spaces, or other Unicode whitespace handled by the browser. The option is enabled by default because visually blank rows often contain invisible indentation left by editors or spreadsheets.

When the option is disabled, only a line with zero code units is removed. A line containing one space, a tab, or another whitespace character is retained exactly. This strict mode is useful for source material where indentation-only rows have meaning, or where the distinction between empty and whitespace-only records needs to remain visible for another diagnostic step.

Retained lines are never trimmed. Leading indentation, trailing spaces, tabs, repeated internal spaces, punctuation, letter case, and Unicode characters remain unchanged. The tool does not collapse whitespace inside a line, wrap prose, remove duplicate content, sort records, or normalize Unicode. Its only decision is whether each complete line passes the selected blank-line predicate.

The input splitter recognizes CRLF, standalone CR, and LF. CRLF counts as one boundary. Generated output joins retained lines with LF, so mixed source line endings become one consistent boundary style. A line ending at the end of the input creates a final empty line, which is then removed under either mode. Leading empty lines and consecutive blank runs are processed individually and reported in the removal count.

A whitespace-only input is valid because its outcome depends on the selected option. With whitespace-only removal enabled, the result is an empty string with one removed line. With strict empty-only removal, the whitespace line remains. Completely empty input is rejected before processing, avoiding an ambiguous report that could otherwise call the absence of text one removable line.

Input is capped at 1,000,000 UTF-16 code units for predictable browser memory and result rendering. Text at the exact limit is accepted. One additional code unit causes a visible error and no partial output. The tool never samples, slices, or silently truncates a large input. Changing the input or blank-line option clears previous output and counts immediately.

The implementation performs a single ordered pass after splitting. It evaluates the selected predicate for each line, appends retained values in original order, subtracts retained count from input count, and joins the result. No dictionary, language model, regular-expression pattern supplied by a user, remote dataset, or third-party dependency is involved.

Use Remove Empty Lines for pasted tables, Markdown drafts, subtitle fragments, email lists, configuration blocks, logs, or code snippets with unwanted vertical gaps. Check the result before replacing a source file, especially for programming languages or formats where blank lines can aid readability even if they do not affect execution.

This tool does not parse CSV records with embedded newlines, quoted JSON strings, rich text, Word documents, or PDF layout. It sees a browser string and documented line boundaries only. Use Remove Duplicate Lines for repeated values, Line Break Remover to join lines with spaces or nothing, and a format-aware editor when line structure has syntax beyond plain text.

Methodology & sources

Validate nonempty text at or below 1,000,000 UTF-16 code units, split CRLF before standalone CR or LF, remove either only zero-length lines or every line whose Unicode-aware trim is empty, preserve all retained code units and order, join generated boundaries with LF, and report input, retained, and removed line counts without truncation.

• MDN — String trim
• MDN — String split

Frequently asked questions

Are spaces removed from retained lines?

No. A retained line keeps all leading, trailing, and internal whitespace exactly.

What does whitespace-only include?

It uses the browser's Unicode-aware trim behavior, covering spaces, tabs, non-breaking spaces, and other recognized whitespace.

What happens to mixed CRLF, CR, and LF endings?

All are recognized as boundaries, and generated output joins retained lines with LF.

Is my text uploaded?

No. Line filtering, counting, and output generation happen locally in the browser.

Related tools

• Remove Duplicate Lines
  Keep the first occurrence of each line with optional case and edge-whitespace comparison, while preserving the retained text exactly.
• Line Break Remover
  Replace, remove, or paragraph-normalize standardized line breaks without trimming or collapsing other whitespace.
• 🧵Line Counter
  Count total, non-blank, and blank lines plus the longest line without uploading your text.
• Whitespace Remover
  Clean pasted text with three explicit modes: collapse horizontal spacing, remove blank lines, or remove every whitespace character.
• Add Line Numbers to Text
  Number every line of pasted text from a chosen starting value with a custom separator and optional zero padding.
• Add Prefix and Suffix to Lines
  Add literal prefix and suffix text to every pasted line, with an option to leave blank lines untouched.

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