Line Length Checker

How Line Length Checker works

Find every line longer than a limit, with its line number and length. Catches over-long commit messages, code lines and caption drafts before they cause trouble. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Finding the lines that break layout

You set a maximum (80 characters by default) and the tool lists every line that exceeds it, with its line number and a preview. That is the fastest way to find the one long line in a thousand-line file.

The line number is the important part: it takes you straight to the offender in an editor.

Where this bites

Code style guides that limit line length, commit message conventions, and any fixed-width display where an over-long line wraps and ruins the alignment of a table.

It also catches accidental pastes — a single-line JSON blob in a file that should be wrapped.

Counting method

Length is counted in characters as the string is stored, so a tab counts as one even though it may render as four or eight columns. If your editor measures visual columns, the two counts will differ on indented lines.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions