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Paste a subject line and preview text. See how they might truncate and which simple warning signs show up. Runs in your browser, so it is unlimited.
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0
Desktop, about 60 characters
Your subject line — Your preview text
Mobile, about 38 characters
Your subject line
Your preview text
Subject length OK
0 characters. It should show in full on desktop and mobile.
Preview text Note
Empty. Many inboxes then show the first lines of the email body instead.
ALL CAPS OK
0% capital letters. Nothing unusual.
Punctuation OK
No excessive punctuation.
Emoji OK
No emoji.
These are rules of thumb, not measurements. Email apps, devices, fonts and settings truncate at different widths, and nothing here predicts spam filtering, deliverability or open rates. Test on the inboxes your readers use.
Runs in your browser. Your text is not uploaded, saved or counted against any limit.
Type a newsletter subject line and, if you have one, its preview text. The tool shows an inbox preview as it might look on desktop, where subjects often cut after about 60 characters, and on mobile, where they often cut after about 35 to 40. It then runs five simple checks: subject length, preview text length (40 to 90 characters is treated as ideal, the same range the PostReady Studio uses), the share of capital letters and fully capitalised words, repeated or excessive punctuation, and emoji count. Each check is a rule of thumb. Inbox apps, devices, fonts and settings truncate at different widths, and a warning means look again, not that something is wrong. Nothing here predicts spam filtering, deliverability or open rates. Put the important words first, write for the reader, and test with the inboxes your subscribers actually use. Everything runs in your browser.
Subject: Your March product update: 3 changes worth a look Preview: Faster exports, a new template picker and fewer clicks to publish.
Subject: 49 characters. Fits desktop (about 60); mobile may cut after about 38. Preview: 66 characters, inside the 40 to 90 range. Capital letters 5%, no excessive punctuation, no emoji.
There is no single right length. Desktop inboxes often show about 60 characters and mobile often about 35 to 40, so the words that matter most should come early.
This tool treats 40 to 90 characters as a good range. Shorter text may be filled from the email body, and longer text is likely to be cut.
This tool cannot tell. Heavy capitals, stacked punctuation and many emoji can read as pushy to subscribers, so they are flagged as things to double-check, not as a deliverability verdict.
No. Everything runs in your browser, and the tool does not use the free uses of the AI tools.