Certain contexts — code style guides, terminal output, fixed-width printed documents — have strict line-length limits, and manually counting characters line by line to find violations is tedious. This tool checks every line at once and flags any that exceed your chosen limit.
It's commonly useful for checking code against a style guide's line-length rule, formatting text for a fixed-width display, or preparing content for a system with strict character constraints per line.
Each line's length is shown alongside the text itself, with lines over the limit marked clearly, so you can quickly scan for exactly which ones need trimming.
Because everything runs locally in your browser, results appear instantly and nothing you type or upload is ever sent to a server.
Bookmark this page if you expect to use this tool regularly — it loads fast and behaves the same way every time, with no account needed.
This kind of task shows up constantly in everyday writing, coding, design, and admin work, which is exactly why a dedicated, focused tool saves so much back-and-forth.
A tool that does one job well, without a cluttered interface or unrelated features competing for attention, tends to be faster to use than a heavier all-in-one app.
If you find yourself needing this conversion or calculation often, keeping this page open in a tab is usually faster than digging through a bigger software suite's menus.
Because there's no sign-up or installation step, you can jump straight from search result to working tool in a couple of seconds.
Frequently asked questions
What line length do coding style guides typically use?
Common conventions range from 80 to 120 characters, though the right limit depends on your specific project's style guide.
Does this count tabs as one character or several?
Tabs are counted as a single character each, matching how most text editors count raw character length rather than visual column width.