Subtitle line length
Why 42 Characters Per Line Is the Subtitle Standard
42 characters per line is the most widely copied number in subtitle formatting. It comes from the Netflix English (USA) Timed Text Style Guide, which caps an English subtitle line at 42 characters and an event at two lines. Because Netflix publishes per-language guides and the number works across screens, 42 has become the de facto default far beyond Netflix itself.
Why 42, specifically?
A line of 42 characters balances two constraints: it stays inside the safe area of a widescreen frame without covering the picture, and it can be read comfortably in the time the cue is on screen. A full two-line subtitle — up to about 84 characters — read at a relaxed pace takes roughly six seconds, which is the origin of the industry's “six-second rule”.
How platforms differ
| Platform / guide | Characters per line | Lines per event |
|---|---|---|
| Netflix (English, USA) | 42 | 2 |
| BBC (broadcast) | 37 | 2 |
| DCMP (open captions) | 32 | — |
| TED | 42 | 2 |
The BBC's tighter 37 comes from teletext's fixed-width display — see BBC subtitle reading speed. The takeaway: 42 is a streaming default, not a universal law. Read the target platform's guide before delivery.
Line-break rules that go with the limit
When a line must split, Netflix says to break after punctuation and before conjunctions and prepositions, and never to separate an article from its noun, an adjective from its noun, or a first name from a last name. A clean break matters as much as the character count.
Check your lines against 42
The subtitle line length checker reports the longest line of every cue against the 42-character and two-line limits, so you can find the exact lines that wrap in the wrong place before you export.
Frequently asked questions
Where does the 42-character limit come from?
It comes from Netflix's English (USA) Timed Text Style Guide, which caps a subtitle line at 42 characters and an event at two lines. The number has since become an informal industry default.
Is 42 characters per line the same everywhere?
No. Netflix uses 42 for English; the BBC keeps 37 for broadcast (teletext heritage); DCMP recommends 32 for open captions; TED uses 42. Always follow the platform you are delivering to.
How long does a 42-character line take to read?
A full two-line subtitle (up to about 84 characters) read comfortably takes roughly six seconds — the origin of the industry's 'six-second rule'.
Do spaces and punctuation count toward the 42?
Yes. Spaces and punctuation inside the line are counted, which is why a line that looks short can still exceed the limit once spacing is included.
Sources & verification date
The figures on this page were checked against the primary sources below on 2026-11-02. Style guides change; confirm the current guide before a formal delivery.