Email Subject Line Tester
Check length, trigger words, capitals, punctuation, numbers, name tokens and emoji to see what may be worth fixing.
Ce contenu est en anglais.
| Length | - |
|---|---|
| Trigger words | - |
| Capital letters | - |
| Punctuation | - |
| Numbers | - |
| Name tokens | - |
| Emoji | - |
What to fix
This is a rule-based guide. It does not predict open rates, so test real subject lines with your own readers.
Exemples détaillés
Checking a shipping notice
Your order has shipped
A score with notes on length, the use of an action word and whether the line is personalised, based on common rules of thumb.
The tester is a guide only and does not predict open rates, which depend on the readers and the sender name.
Checking a personalised offer
Asha, your autumn offer ends Friday
A score with notes that the line is personalised and includes a deadline, based on common rules of thumb.
Results come from rules of thumb, so test the subject line with a small group before using it widely.
À propos de Email Subject Line Tester
The subject line is often the first thing a reader sees in their inbox, so a few well chosen words can decide whether an email is opened or left for later. An email subject line tester checks your line against common rules of thumb and gives it a score out of 100. It looks at length, trigger words that often appear in unwanted mail, the use of all capitals, repeated punctuation, numbers, name tokens and emoji. Each area gets its own score, so you can see what is working well and what might be worth changing.
This tester is a guide. It does not predict open rates, because those depend on your readers, your sender name, your send time and the rest of your message. Use the score to spot easy improvements, then test two or three versions with your own list to see what your readers actually respond to. Keep a note of what works, and the tester will help you build a steady habit of writing clear, honest subject lines that set the right expectations for the email inside.
Comment utiliser Email Subject Line Tester
- Type or paste your subject line into the box.
- Read the overall score and the verdict beside it.
- Look at each category to see which parts lost points.
- Work through the list of things to fix, starting with the largest losses.
- Write two or three variations and test them with a small part of your list.
Usages courants
- Checking a newsletter subject line before a big send
- Comparing two possible subject lines for the same campaign
- Teaching a team the basics of clear subject line writing
- Reviewing a set of automated emails for shouting or repeated punctuation
Questions fréquentes
What length should an email subject line be?
A subject line of 30 to 50 characters usually reads well on both desktop and phone screens. Shorter lines can feel abrupt, and longer lines may be cut off on small screens before the important words appear. The tester gives full marks for length in this range and reduces the score gradually as the line moves outside it.
Why does the tester check for trigger words?
Some words appear often in unwanted or pushy mail, such as urgent, winner or act now. Filters and readers can both react to them, so the tester flags these words and lowers the score a little for each one. Rewriting the line in plain, specific words usually makes it more honest and more likely to be read.
Is it bad to use capital letters?
Words written in all capitals can look like shouting, and too many of them make a line harder to read. A single acronym such as NHS or BBC is normal, but a whole phrase in capitals usually works better in sentence case. The tester reduces the score for each all-capital word of three or more letters so you can spot them quickly.
Should I use emoji in my subject line?
One emoji can help a subject line stand out and suit a friendly brand, but several emoji can look cluttered. The tester gives the best score for one or two, a lower score for none, and a reduced score for three or more. Choose emoji that match your brand and the message, and check how they look on a phone.
Do name tokens always help?
A name token such as first_name can make a subject line feel personal, but only when your email tool fills it in correctly. If a name is missing, the line can look broken, so always check a test send first. The tester only looks for the token itself, so it cannot confirm that your tool will replace it with a name.