If You Can Type, You Can Use This
Write Subject Lines That Actually Get Opened (Without Doing Anything Hard)
Write Subject Lines That Actually Get Opened (Without Doing Anything Hard)
No signup. No payment. No brain strain. Totally FREE.
Just click the blue button, activate the GPT and boom—you're done.
(Need help using this thing? Click the white button)
"Dude. I used to spend like 45 minutes rewriting the same subject line and still hate it. Now I drop my idea into this thing and boom—5 solid options in seconds. It's like having a chill copywriter buddy who doesn’t judge my caffeine addiction."
Roger Santos
@iLoveGPTs
Struggling to write subject lines that actually get opened? Killer Subject Lines is your chilled-out, high-converting copy buddy that makes crafting irresistible email intros easy—even on burnout days. Whether you're selling, nurturing, or launching, it gives you the kind of punchy subject lines and previews that grab attention and earn clicks.
This GPT doesn’t just throw random ideas at you—it works with your copy, your tone, and your goals. It analyzes email content, tunes up your subject lines, brainstorms irresistible hooks, and never sounds spammy. Designed with a slacker genius vibe, it sneaks pro-level persuasion into every line without making it feel like hard work.
Killer Subject Lines GPT
Killer Subject Lines GPT
User Guide
User Guide
Because You’ve Got Better Things to Do Than Write Email Hooks
Because You’ve Got Better Things to Do Than Write Email Hooks
🧠 What It Is (Without the Tech Nonsense)
🧠 What It Is (Without the Tech Nonsense)
Each subject line comes as a full package:
Subject Line
Preview Text
Lead-In Line
Hook Type
Use Case
Pro Tip
🔧 How To Use It (Even If You're Half-Asleep)
🔧 How To Use It (Even If You're Half-Asleep)
Open the GPT (link at the bottom)Type anything : an idea, a topic, a product, even a half-baked subject lineGet back gold : a subject line package you can actually useCopy + Paste – no edits, no thinking, no dramaDone . Go eat snacks. Or pretend you wrote it.
💬 100 Prompts – Categorized For Easy Use
💬 100 Prompts – Categorized For Easy Use
Give me subject lines for a weight loss offer
Subject lines that use fear for a tax deadline
Curiosity hook for a re-engagement email
Hooks using nostalgia for 90s fitness challenge
“Almost too late” hook for cart abandon
Make this feel like a dare for a workout offer
Subject lines that spark envy for luxury lifestyle
Give me one-word subject lines
Hook that turns a guarantee into a challenge
Hook that sounds like a secret leak
Why does “Your future self will thank you” work?
What’s wrong with: “Try This New Thing”?
Compare: “Don’t skip this” vs. “Final warning”
Break down the hook: “She lost 42 lbs drinking this”
Tone check: “We need to talk” vs. “Heads up…”
Review: “I can’t believe how fast it worked”
A/B: “This changes everything” vs. “Game-changer”
Why did this old subject line perform well?
Audit this batch of 5 subject lines
Tell me why this subject works: [insert line]
Rewrite this like a sarcastic friend
Make it sound like a confession
Make it sound like an ex sent it
Passive-aggressive rewrite of: “We noticed you didn’t…”
Make this subject line tweet-sized
Make it sound like a desperate voicemail
Subject lines that spark envy for luxury lifestyle
Rewrite it like a reality TV teaser
Make it sound like a 3AM thought spiral
How would David Ogilvy write this?
Full email opener for a Black Friday sale
Launch sequence opener for a course
Match preview to: “What’s really in your coffee?”
Add 3 preview options to: “The ugly truth about carbs”
Rewrite this for mobile: [paste subject]
“Oops” subject + preview combo
Reversal hook for a webinar
Cold list revival subject + preview
What-if hook + preview for real estate lead gen
Turn a feature into a curiosity-based subject package
Hook that sounds like breaking news
Flip this benefit into a curiosity teaser
Add contradiction to this subject
Good news / bad news format
Clickbait that actually delivers value
Make this feel like a leaked secret
Hook that feels “accidental”
Make this sound like someone yelled it across a room
Hook with flawed logic
Make this a plot twist subject
Give me 3 curiosity-based subject lines
Give me 3 fear-based lines for this product
One subject per category: curiosity, scarcity, proof
Best hook type for a luxury skincare offer
Reversal hooks for a coaching program
Envy-based subjects for fashion
Guilt hook for a nonprofit
Myth-busting hook for crypto
Nostalgia-based hooks for 40+ crowd
Social proof hooks for SaaS
Turn this testimonial into a subject line
Rewrite this podcast title as subject lines
Convert this blog headline into 3 subject ideas
Turn this into an inside joke-style subject
Add drama to this update
Make this a “plot twist” hook
Extract the best hook from this email
Convert this social post into subject lines
Rewrite this opener like a mentor wrote it
Give me 3 hooks from this email paragraph
Hooks for people who didn’t click last time
Urgent-style subject without the word “urgent”
What would a grumpy chef write about this?
Subject that sounds like a scandal
Two versions: one for warm list, one for cold
Write this like it’s an infomercial teaser
Hook from a passive-aggressive roommate
“If-then” subject variations
Subject line for people who don’t think they need this
Add irony to this subject line
What emotion does this hook trigger?
Label this subject by hook type
Turn this session into a swipe file
Compare these 3 subjects—what works best?
Rewrite this subject in 3 emotional tones
Explain why this subject converts
What angle is this subject using?
Rank these 5 subject lines
Categorize my last 5 subject lines
Reframe this subject 3 different ways
Make this sound like gossip
Make this a dad joke
Turn this into a fight starter
Scam email–style subject for a legit offer
Petty tweet–style rewrite
“I dare you” subject format
Misleading first half, real second half
Rewrite like a jealous friend wrote it
Turn this into a prank
Make it sound like you regret sending it
✅ 30 Tips - Organized For Max Effect
✅ 30 Tips - Organized For Max Effect
Keep it short—1–2 lines max
Always ask for subject + preview + lead-in
Use hook categories to sort your best ones
Bookmark the KillerEmails.com link—it’s your next step
Ask “why” to learn from the output
Don’t overthink—give it a dumb input, get smart results
Reuse great prompts, mix them up
Let the AI write it, then tweak if needed
Save good lines to your own swipe file
Use preview lines to do the heavy lifting
Ask for A/B breakdowns on your subject lines
Use emotion type swaps (curiosity → fear, etc.)
Try “if you liked X, you’ll love Y” hooks
Roleplay famous copywriters
Ask for subject line audits
“What NOT to do” prompts teach fast
Add story-style lead-ins for emotional hooks
Flip a benefit into a reversal
Run 3 hooks for cold vs. warm lists
Ask for pro tips—every single time
Use weird character voices (grumpy chef, lazy intern)
Try prank or mistake-style hooks
Text-message tone wins on mobile
Use “accidental” or “oops” formatting
Create inside jokes from brand voice
Ask for drama where there is none
Flip “boring” into “bold” with sarcasm
Mix tones (angry, nostalgic, hopeful)
Ask for “what if this were gossip?”
Let the GPT go weird—it’ll surprise you
🎯 Bottom Line
🎯 Bottom Line
You’re not trying to win awards. You’re trying to get emails opened.
Just open the tool. Type some words. Watch it do what you wish your brain would do on a deadline.
✅ Launch it now. Copy. Paste. Done
✅ Launch it now. Copy. Paste. Done
🧠 Want the Rest of the Email Written Too?
🧠 Want the Rest of the Email Written Too?
Once Killer Subject Lines GPT hooks 'em, you still gotta send something worth reading. But hey—why write that yourself when an AI can do it better and faster than your caffeine-deprived brain ever could?
Just plug your subject line into our fave email writer and boom: full email written.
Hooks + body copy = done.
No sweat
No second drafts
No soul-crushing overthinking
It’s like having a full-stack copy team that works for snacks. (Just like me.)