Email Subject Line LengthEmail subject lines have no meaningful technical limit, but inboxes truncate them: desktop clients show roughly 60 characters and mobile clients closer to 30-40. The working rule is to make the first 40 characters carry the message, with the preheader (about 40-100 visible characters) as backup.
Verified July 2026. Platforms adjust limits over time.
| Field | Limit |
|---|---|
| Subject line (desktop display) | ~60 characters |
| Subject line (mobile display) | ~30-40 characters |
| Recommended length | 30-50 characters |
| Preheader text (visible) | ~40-100 characters |
WordLimit shortens your text to the exact word or character count you need - it trims redundancy while keeping your key information and your own writing style, so human-written text stays recognizably human. Check your current count with the free word limit counter first.
30-50 characters is the safe range: short enough to survive mobile truncation, long enough to say something specific. Front-load the words that make the case to open.
WordLimit
