The Email Preview Text Most Businesses Leave Blank (And What to Put There Instead)

02 October 2026·5 min read

Quick answer: Preview text (also called a preheader) is the snippet that shows up next to or under your subject line in someone's inbox, and most businesses either leave it blank or let it default to "View this email in your browser." That's free real estate you're throwing away. Write 40-90 characters that add a second idea the subject line didn't already say, and you'll see opens creep up without changing a single thing about your subject lines. It's one of the fastest, cheapest wins in email marketing. 📈

Here's the thing nobody tells you when you're setting up email marketing for the first time: your subject line is only half the pitch. The other half — the preview text sitting right next to it — decides whether someone taps your email or swipes it away, and most businesses hand that decision over to whatever junk their platform auto-generates. I've opened client accounts and found "Is this email not displaying correctly? View it in your browser" sitting there as the entire second line of every single send. That's not neutral — it tells someone the email isn't worth their time before they've even read the subject. I love a good subject line as much as the next person 💖, but I'd take a mediocre one with great preview text over a brilliant one with blank preview text any day.

What most businesses get wrong

The default assumption is that preview text is a technical setting, not a copywriting opportunity — something your email platform handles, not something you write. So it gets ignored, or it gets treated as a mini repeat of the subject line ("New offer! New offer, don't miss it!"), which wastes the slot entirely. The other common mistake is writing preview text that's too short and gets cut off mid-sentence, or too generic to earn a click ("Check out what's new this week"). Preview text works when it's doing a different job to the subject line: the subject line gets attention, the preview text gives a reason. They're a one-two punch, not an echo.

The preview text formula (copy this):

Add a specific detail the subject line left out. Subject: "Your appointment reminder." Preview: "Plus what to bring and where to park."
Answer the question the subject line raises. Subject: "We're changing something." Preview: "Here's exactly what's different from 1 November."
Use a name, number or timeframe. Specifics outperform vague enthusiasm every time — "3 spots left for October" beats "Limited availability!"
Keep it to 40-90 characters so it doesn't get truncated on mobile, where most people are reading anyway.
Never repeat the subject line word for word. If you can't think of a second idea, that's a sign the email itself needs a reason to exist.

Quick fix if you're short on time: write your subject line first, then ask "what's the next sentence I'd say out loud to a friend explaining why they should open this?" That sentence is your preview text.

A booking-based business with lots of no-shows: Instead of "Appointment reminder" with default preview text, try subject "See you Thursday?" with preview "Reply to confirm or move it — takes 10 seconds." The preview text does the actual work of reducing no-shows, not the subject line.

A B2B firm with a long sales cycle: A nurture email titled "Thinking about Q1?" paired with preview text "3 questions to ask before you budget for this" gives a hesitant, slow-moving buyer a reason to open now instead of archiving it for "later" (which usually means never).

A seasonal local service business: Subject "We're booking out fast" with preview "October and November are nearly full — here's what's left" turns a generic urgency line into something that reads as genuinely useful, not just a sales push.

How to actually set this up

In most email platforms (Klaviyo, Mailchimp, Flodesk, even plain Shopify email), there's a dedicated preview text or "preheader" field separate from the subject line and body — look for it directly under the subject line field when building a campaign. If your platform doesn't have one, the workaround is to put your preview text as the very first line of the email in white text on a white background (tiny font size), so it shows in the inbox preview without cluttering the email itself. One caution: test a send to your own inbox first, since rendering varies a little between Gmail, Outlook and Apple Mail.

💡 Batch-write your preview text at the same time as your subject lines, not after. If you write the subject line, hit save, and come back to preview text as an afterthought, it almost always ends up repetitive or forgettable. Write them as a pair — subject line asks the question, preview text gives the hook — and you'll stop leaving that second line blank for good.

Mistakes to avoid

Letting the default text stay in: "View this email in your browser" or "Having trouble viewing this email?" tells someone the email isn't worth opening before they've even read your subject line.
Repeating the subject line: if your preview text says the same thing in different words, you've wasted a second impression.
Writing it too long: most inboxes cut preview text off around 40-90 characters depending on device — check the cut-off point, not just the full sentence you wrote.
Being vague to sound "on brand": cute or clever beats clear maybe once in ten emails. The other nine times, specific wins.
Forgetting mobile entirely: most people are opening email on their phone, where preview text is often the only extra information they see before deciding to tap.

Frequently asked questions

How long should preview text actually be?

Aim for 40-90 characters. Shorter and you're not using the space; longer and it gets cut off, sometimes mid-word, which looks messier than leaving it blank in the first place.

Does preview text actually improve open rates, or is this overstated?

It genuinely helps, but it's not a magic lever — if your subject lines are weak or your list is unengaged, better preview text alone won't rescue your open rate. Think of it as removing a small but real piece of friction, not a fix for a list that needs re-engagement or a sender reputation issue.

Can I use emojis in preview text?

Sparingly, yes — one emoji can help it stand out in a crowded inbox, but an emoji in both the subject line and preview text starts to look like spam formatting. Pick one spot for it, not both.

What if my platform doesn't have a preview text field?

Use the hidden first-line trick (white text on white background, tiny font) as a workaround, but test it in your own inbox first across a couple of email clients, since rendering isn't always consistent.

Keep reading 🤍

Written by

Kate, founder of Chronically Online

I help Gold Coast and Brisbane businesses grow with branding, websites and marketing that actually works.

Work with me ✦