Line Counter — Count Lines in Text Online

A line is any sequence of characters that ends with a newline character or is the last portion of text after the final newline. When you press Enter in a text editor, you create a new line. Our tool splits the input on newline boundaries, which means the total line count equals the number of newline characters plus one (for the last line) unless the text ends with a trailing newline. An empty document with no characters has zero lines. A single character with no newline counts as one line. This behavior matches the POSIX definition used by the Unix wc command and most programming language standard libraries.

Line endings differ between operating systems. Unix, Linux, and macOS use a single Line Feed character (LF, represented as \n) to mark the end of a line. Windows uses a two-character sequence of Carriage Return followed by Line Feed (CRLF, represented as \r\n). Older Mac systems used a standalone Carriage Return (CR, \r). Our line counter normalizes all three formats internally, so it produces accurate counts regardless of which operating system created the text. When you paste content from a Windows text file or a Unix terminal output, the line count will be identical. This normalization prevents the off-by-one errors that often occur when mixing line ending formats across platforms.

An empty line is a line that contains no visible characters. A line is considered empty if it consists solely of whitespace characters such as spaces and tabs, or if it contains nothing at all between two consecutive newline characters. The "Remove empty lines" option strips all such lines from your text, which is useful for compacting configuration files, cleaning up pasted terminal output, or preparing data for processing by tools that do not tolerate blank lines. The empty line count in the stats dashboard reflects the number of these whitespace-only or completely blank lines present in your input.

Line counting is used across many fields. Software developers count lines of code (LOC) to estimate project size and track changes across commits. System administrators count lines in log files to measure event frequency and detect anomalies. Data analysts count rows in CSV and TSV files to verify record counts after data exports. Writers count lines in poetry, scripts, and structured content to maintain formatting standards. Quality assurance engineers count test cases and assertions listed in plain text test plans. Network engineers count lines in routing tables and firewall rules to audit configuration complexity. The tool is also useful for anyone who needs to quickly check how many items are in a pasted list, such as email addresses, URLs, or inventory codes.

Lines of code, or LOC, is a software metric that counts the number of lines in a source code file. There are several variants of this metric. Physical LOC counts every line in the file including blank lines and comments. Logical LOC counts only the lines that contain executable statements, excluding blanks and comments. Source Lines of Code (SLOC) is a synonym that sometimes refers to non-blank, non-comment lines specifically. Our tool counts physical lines, which gives you the raw total. To approximate SLOC, you can use the "Remove empty lines" option to strip blanks and then subtract the comment lines manually. For large codebases, dedicated tools like cloc or sloccount provide automated comment detection, but for quick checks on individual files or snippets, this line counter delivers instant results.

Yes. All transformation options work together in real time. When you enable sorting (A to Z, Z to A, or by length) and also check "Remove empty lines," both operations are applied simultaneously. The tool first removes empty lines, then sorts the remaining lines according to your selected order. You can also enable line numbering on top of sorting and filtering. The transformed text appears directly in the text area, ready to be copied. If you want to restore the original text, simply undo using your keyboard shortcut (Ctrl+Z or Cmd+Z) or clear the field and paste your original content again.

No. All processing happens locally in your web browser using JavaScript. Your text is never transmitted over the network, stored on a server, or logged in any way. This makes the tool safe for sensitive content such as proprietary source code, server logs containing IP addresses or user data, confidential documents, and internal configuration files. You can verify this by disconnecting from the internet and confirming that the tool still works perfectly. We designed it this way because privacy is a fundamental requirement for any text processing tool that handles real-world data.