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Email Subject Line Analyzer

Score a subject line and see how it truncates on mobile.

Marketing Tools Reviews Free · no sign-up

How it will appear

Score

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Characters—
Words—
Capitals—

Quick Tool Overview

The Email Subject Line Analyzer scores a subject line out of 100 on length, spam words, capitals, emoji, personalisation and urgency, and shows exactly where it truncates on mobile and desktop.

What it does
Scores a subject line and previews how it truncates
You give it
An email subject line
You get back
A score out of 100, named findings, and truncation previews
Best for
Choosing between subject line drafts before a send
Marketing Tools Free, unlimited use No sign-up Runs in your browser

About the Email Subject Line Analyzer

A subject line is judged in a preview pane roughly forty characters wide on a phone, so the half you wrote last is often the half nobody reads. Length alone changes whether the offer, the urgency or the brand name survives the cut.

Paste a subject line and this tool scores it out of 100 on the things that actually move open rates: character and word count, spam trigger words, shouting capitals, emoji use, whether a personalisation token is present, and whether it leans on urgency language.

Alongside the score it shows the line exactly as it will truncate in a typical mobile preview and a typical desktop one, so you can see for yourself whether the important part is still visible.

Key features of the Email Subject Line Analyzer

Mobile and desktop previews

See the cut-off point on each, so the key words survive.

Six scoring factors

Length, spam words, capitals, emoji, personalisation and urgency.

Specific findings

Each one names the actual word or count behind it.

Runs in your browser

No sign-up, no data sent anywhere.

How to use the Email Subject Line Analyzer

  1. 1

    Paste your subject line

    The score and the previews update as you type.

  2. 2

    Check the truncation previews

    Mobile cuts far earlier than desktop — make sure the point survives.

  3. 3

    Read the findings

    Each one names the specific word or count causing it.

  4. 4

    Rewrite and compare

    Edit in place and watch the score move.

Frequently asked questions

Roughly 30 to 50 characters is a commonly recommended range, mostly because mobile previews typically cut off somewhere around 35 to 45 characters. Shorter than about 20 often reads as vague, and past 60 the end is usually invisible on a phone.

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