Close, not pixel-exact: every inbox shifts a little with screen size and settings. The text is measured in each inbox's own font, which is what decides the cut.

Do I need an account?

No. This one runs entirely in your browser — nothing is sent anywhere.

SendLintTools

All tools

Subject & pre-header preview

See where each inbox cuts the subject line and the pre-header, on desktop and phone. Inboxes cut by width, not character count, so the text is measured in each inbox’s font. Close, not pixel-exact: every inbox shifts a little with screen size.

Harbourline — a fictional brand

From name

Subject line

0 characters

Pre-header

0 characters

Desktop

Gmail — web

Sender name

Outlook — desktop

Sender name

Apple Mail — Mac

Sender name

Phone

iPhone Mail

Sender name

Gmail app — phone

Sender name

Outlook app — phone

Sender name

What you get

Gmail, Outlook and Apple Mail on desktop; iPhone Mail, Gmail and Outlook on phone
Where the subject and the pre-header are cut, and the last words that show
Subject and pre-header read straight from an .eml or .html file

How it works

Type the sender name, subject line and pre-header — or load them from an email file.
Read each inbox's row and the characters it shows.
Tighten the copy until the important words land before the cut.

Frequently asked questions

Is it exact?: Close, not pixel-exact: every inbox shifts a little with screen size and settings. The text is measured in each inbox's own font, which is what decides the cut.
Do I need an account?: No. This one runs entirely in your browser — nothing is sent anywhere.

More tools

The tools are part of SendLint, which checks every email in a campaign against its copy deck and creative — every version, both languages, every round. See SendLint.