Testimonial Request Email Subject Lines That Actually Get Opened
Swipe 20+ testimonial request subject lines plus the principles behind them, so your collection emails get opened and answered.
Your testimonial request can be perfect — but if the subject line flops, nobody reads it. Subject lines are 80% of whether your email gets opened. Here are the patterns and examples that work.
Keep it short and human
Subject lines under 30 characters read as personal notes, not marketing. “Quick favor?” beats “We’d Love Your Feedback on Our Product.”
Use curiosity and specificity
Hint at what is inside without giving it all away: “20 seconds, {{firstName}}?” or “About that thing you said…” Open loops drive opens.
Personalize with a token
First names lift open rates measurably. Reference their company or a recent win for an even bigger bump.
Swipe these subject lines
Try: “A 30-second favor?” · “Mind if I quote you?” · “You said something great” · “Help another team like yours” · “Two sentences?” · “Can I brag about your results?”
Match the subject to the body
Do not bait-and-switch. If the subject promises 30 seconds, the body must deliver a 30-second ask with a one-click link.
Key takeaways
- Aim for under 30 characters.
- Lead with curiosity, not corporate-speak.
- Personalize with name or company.
- Keep the promise the subject makes.
Frequently asked questions
Do emojis help in testimonial subject lines?
Occasionally — a single, relevant emoji can lift opens, but test it. Overuse reads as spam and can hurt deliverability.
How long should the email itself be?
Three to four sentences. State the ask, the time it takes, and the link. Anything longer reduces replies.
Collect testimonials like this with Credibuilt
You don’t need a developer or a video crew. Credibuilt gives you a branded collect link, an approval inbox, and a one‑line Wall of Love embed that loads in milliseconds. It’s free forever — start collecting in under two minutes.
Keep reading: How to Ask for a Testimonial on LinkedIn (and Turn It Into a Recommendation)