3 Line Length Checkers, Compared Honestly

You have a block of text going somewhere with a hard limit per line — subtitles capped at 42 characters, product labels that must not wrap, a display with a fixed character width. You need to know which lines break the limit, and you need to know it before the text reaches the thing that will truncate it.

Most character counting tools answer a different question. They count the whole block, which tells you nothing useful when the constraint is per line: a 400-character paragraph can sit comfortably under a total limit while containing three lines that overflow. And the tools that do work per line are almost all built for subtitles specifically, which means they want an SRT or VTT file rather than the plain text you happen to have.

How to judge a line length checker

Does it count per line or in total? This is the whole distinction, and total-count tools vastly outnumber per-line ones.

Does it need a subtitle file? SRT-aware tools are better at subtitles and useless for a list of labels.

Can you set the limit? 42 characters is the subtitle convention; your display, label, or field will have its own number.

Does the text leave your machine? Unreleased scripts and product copy are not always things you want uploaded.

The comparison

Facts checked August 2026; plans can change.

MacParakeet subtitle character counter

MacParakeet is the cleanest of the three for the core check. It counts characters per line and characters per second for SRT and VTT files, is browser-based with no upload stated, and uses default limits of 20 CPS and 42 characters per line following common streaming guidance. Having sensible defaults matters — most people do not know what limit they should be applying.

It expects a subtitle file. If your text is a column pasted from a spreadsheet, you are converting it into SRT first, which is more work than the check itself.

SRT Subtitle Checker

SubtitleChecker goes furthest on subtitle quality assurance, checking line length and CPS alongside two-line limits, timing overlaps, numbering issues, and general readability, running in your browser with no upload. If you are delivering subtitles to a platform with a spec, this catches the things that get a file rejected.

That breadth is overkill when line length is the only thing you care about, and again it is file-oriented rather than text-oriented.

Subtitle Line Length Limiter

This one acts rather than reports. You pick a character-per-line limit from presets or set a custom value between 20 and 80, and it splits overly long cues into two with proportional timing. When you have a file that fails and you want it to pass, doing the work is more useful than describing the problem.

Automatic resplitting is a judgement call about where to break, and line breaks in subtitles carry meaning — a break in the wrong place hurts readability even when the character count passes. Review what it did.

Character Count Per Line Checker

Ours works on plain text. Paste any multi-line text, set your limit, and it shows the character count for each line and flags the ones that exceed it — no file format, no conversion, no assumption about what the text is for. That makes it the fit for labels, fixed-width displays, form fields, and subtitle text you have not yet turned into a file. It runs entirely in your browser.

The limitations are the direct cost of that generality. It counts characters per line and nothing else: no characters-per-second reading-rate check, no timing validation, no awareness of subtitle structure, and no automatic resplitting. For a subtitle file heading to a platform with a delivery spec, one of the tools above will catch problems ours cannot see. Ours tells you which lines are too long, which is frequently all you needed.

Which one to pick

• If you are checking an SRT or VTT and want CPS as well, use MacParakeet.
• If the file is a deliverable that must pass a spec, SubtitleChecker’s full QA is the safer pass.
• If you need long lines actually split rather than flagged, use the Line Length Limiter.
• If you have plain text and a character limit, use ours.

How to do it with Character Count Per Line Checker

1. Open the Character Count Per Line Checker.
2. Paste your text, one item or subtitle line per line.
3. Set the limit your destination actually enforces.
4. Rewrite the flagged lines rather than letting something else truncate them. More writing tools are in the tools directory.

You might also need

• Caption Line Counter — for social captions with their own platform limits.
• Subtitle Editor — when the text needs to become a timed subtitle file.

Frequently asked questions

Is there a free line length checker that doesn’t need an account?

Yes — all three tools above are free and browser-based with no upload stated, and ours requires no account because the site has no signup at all.

How many characters should a subtitle line be?

42 characters per line is the most widely cited convention, with a two-line maximum per cue and a reading rate around 20 characters per second. Accessibility guidance such as the BBC’s subtitle guidelines sets out the reasoning, though individual platforms publish their own specs.

Why does my character count differ between tools?

Usually whitespace and line-break handling. Some tools count trailing spaces, some strip them, and some count a two-line cue as one string. For anything near a hard limit, check what the tool counts before trusting the margin.

Final thought

Check per line, not in total, and use the limit your destination actually enforces rather than the one you remember. Truncation is silent, and by the time you see it the text is already on screen.

Try the free Character Count Per Line Checker