How do I convert CRLF to LF?

Choose LF as the line ending and download the result. In Git, git config core.autocrlf input stops CRLF being committed.

What is a byte-order mark?

The character U+FEFF at the start of a file. In UTF-8 it is three bytes, EF BB BF. Some Windows editors add it; most Unix tools do not expect it.

Why does my script say bad interpreter?

Usually the first line ends in CRLF, so the system looks for /bin/bash\r. Convert to LF.

Should files end with a newline?

POSIX defines a line as ending in a newline, and many tools expect one. Git shows “No newline at end of file” when it is missing.

Convert line endings and clean whitespace

Convert CRLF to LF, strip trailing spaces, swap tabs and spaces, and remove a byte-order mark.

Runs in your browser. Your input is not uploaded.

Line endings

Tabs and spaces

Final newline

Open the file to check its line endings. Browsers convert pasted or typed line endings to LF.

Input

Result (CR and CRLF shown as ␍ and ↵)

Loading the tool…

What it does

Windows writes line endings as CRLF (\r\n); Linux and macOS use LF (\n). Mixed endings produce noisy diffs, ^M characters in shells and scripts that fail with bad interpreter.

This tool reports which endings the text contains, converts them, and fixes the other usual whitespace problems: trailing spaces, tabs versus spaces, a byte-order mark and a missing final newline.

How to use it

Open the file. The counts of LF, CRLF and CR endings appear straight away. (Pasting works for whitespace clean-up, but browsers turn pasted line endings into LF, so open the file to see the real endings.)
Choose the target line ending and any clean-ups.
Download the result. Download keeps the exact bytes.

Things to watch for

Copying to the clipboard can change line endings on some systems. Use Download when the exact bytes matter.
Converting tabs to spaces expands every tab to a fixed width; it does not align to tab stops.
A BOM at the start of a shell script stops the #! line from working. Remove it.

Questions

How do I convert CRLF to LF?: Choose LF as the line ending and download the result. In Git, git config core.autocrlf input stops CRLF being committed.
What is a byte-order mark?: The character U+FEFF at the start of a file. In UTF-8 it is three bytes, EF BB BF. Some Windows editors add it; most Unix tools do not expect it.
Why does my script say bad interpreter?: Usually the first line ends in CRLF, so the system looks for /bin/bash\r. Convert to LF.
Should files end with a newline?: POSIX defines a line as ending in a newline, and many tools expect one. Git shows “No newline at end of file” when it is missing.