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- Free
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- Works on any device
Create a QR code for a link, Wi-Fi, WhatsApp, contact and more, or read one from a photo.
- Free
- No sign-up
- Works on any device
Fill in the details to see your QR code.
PNG for phones, chats and websites. SVG and PDF stay sharp at any size, which is best for printing. Tip: point your phone camera at the preview to test it.
3. Style (optional): colors, dots, logo
Choose a photo or screenshot or drag it here
Works with photos of printed codes, screenshots and image files.
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Email subject line tester
Score your subject line for length, spam words and capitals, and preview it in an inbox.
- Free
- No sign-up
- Works on any device
About Email subject line tester
Scores a subject line on length, spam-trigger words and excessive capitals, and previews how it appears in an inbox. Mobile screens cut subjects at about 30 to 40 characters, so the key words belong at the start. ALL CAPS and many exclamation marks also raise spam suspicion.
How to use Email subject line tester
- Type your email subject line.
- Review the score and notes on length, spam words and capitals.
- Edit the subject and watch the inbox preview update.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
How long should an email subject be?
Aim for about 40 to 50 characters. Mobile inboxes show even less, so place the most important words near the beginning.
Why do capital letters hurt a subject line?
ALL CAPS looks like shouting and is common in spam, so filters and readers react badly. Use normal sentence case, with a capital only where it is natural.
Do emojis help or hurt?
A single relevant emoji can draw the eye, but many look spammy. Test your audience and keep the key words at the start of the line.
Is Email subject line tester free?
Yes. Email subject line tester on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Email subject line tester on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.