AI Subject Line Generator
AI Subject Line Generator
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Generate email subject lines from your draft or brief. Choose tone, audience, and length to match your campaign. Improve open rates with copy-ready options.
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Automate Web Data Extraction FasterUse Thunderbit to scrape websites and extract structured data in a few clicks. Automate collection from subpages, PDFs, and images, then export to Sheets, Airtable, or Notion.
Install fromChrome Web Store
Automate Web Data Extraction Faster
Thunderbit helps you scrape data from websites, subpages, PDFs, docs, and images using an AI-powered Chrome extension. Click AI Suggest Fields, then Scrape to capture clean tables, and use AI to summarize, categorize, and format results.
Export your extracted data to Google Sheets, Airtable, or Notion for outreach, research, and reporting. Use pagination and subpage scraping to scale collection across listings, and keep workflows automated with scheduled scraping.
How to Generate Email Subject Lines Using Thunderbit
STEP 1Download and InstallDownload and install the Thunderbit Chrome Extension from the Thunderbit Chrome Extension Download Page. Once installed, log in or create a free account to get started.
STEP 2Open ExtensionOpen the Thunderbit Chrome Extension, then go to the AI Subject Line Generator and select the "Generate Subject Lines" tab. In the "Email Description / Body" field, paste your email draft or describe what the email is about. Choose a "Tone of Voice" (for example, professional or friendly). Optionally, add a target audience, set a character limit, and choose whether to include emoji options.
STEP 3Click the Generate subject lines ButtonClick the "Generate subject lines" button to create 10 copy-ready subject line options based on your inputs. Review the results and copy the lines you want to use in your email platform. If you need different angles, adjust the tone, audience, or character limit and run the generator again to produce a new set.
Learn how to generate high-performing email subject lines with AI
Generate subject lines from your email draft
Paste your email body or describe what you plan to send, and the AI Subject Line Generator returns 10 copy-ready subject lines based on your message. It’s built for marketers, sales teams, founders, and customer success teams who need strong subject lines without rewriting from scratch. You get multiple angles such as benefits, curiosity, urgency, and direct value, all grounded in your actual content.
Control tone, audience, length, and emoji options
Choose a tone of voice such as professional, friendly, urgent, or bold, then optionally add a target audience to make the wording more specific. Set a character limit to fit mobile inboxes and A/B testing needs, or leave it blank to receive a mix of short and long options. You can also toggle emoji suggestions on or off to match brand guidelines.
Improve open rates for sales outreach and follow-ups
Use the tool to write subject lines for cold emails, warm follow-ups, demo reminders, and re-engagement campaigns. Sales teams can tailor lines to roles like SaaS founders or HR managers, while keeping the tone consistent with the outreach sequence. The 10-option output makes it easy to pick a safe choice, test a curiosity angle, or run quick A/B tests across segments.
Speed up marketing campaigns, newsletters, and product updates
Marketing and lifecycle teams can generate subject lines for newsletters, product launches, webinar invites, and promotional campaigns using the same input draft they already have. The character limit setting helps you stay within inbox display constraints, and the tone selector keeps messaging aligned with your brand voice. The result is clean text you can paste into any email platform or CRM.
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What users say about Thunderbit
Taryn W.Growth Strategist@Thunderbit changed how I run competitor research. I click 'AI Suggest Fields,' and it builds a clean table across paginated results—no coding, no CSS. Huge time-saver when analyzing product data from long-tail marketplaces.
Miles T.Sales Development ConsultantI use Thunderbit to grab emails and phone numbers from directories. It extracts clean contact info in one click, and exporting to Sheets or Notion takes seconds. No extra setup, no coding—just usable data ready to work with.
Rhea C.E-commerce AnalystThunderbit helps me monitor SKU data across multiple pages. I scrape the listings, then use Subpage Scraping to pull full product specs, pricing, reviews, and stock. The AI organizes everything into columns I define.
Cassian B.Real Estate AdvisorThunderbit's Scheduled Scraper makes real estate tracking easier. I describe the interval in plain English, and it automatically pulls updated listings, prices, and links without touching the setup again. Simple and very practical.
Dorian B.Content & SEO SpecialistI use Thunderbit's Field AI Prompts to clean and tag scraped blog content. It extracts titles, authors, and even suggests categories. Works great across dynamic sites and subpages—perfect for building structured SEO datasets.
Lina K.Marketplace Operations LeadWe track SKUs from niche stores using Thunderbit. Cloud Scraping handles 50 pages at a time, and for login-required sites, we switch to browser mode. It’s fast, flexible, and doesn’t need ongoing maintenance or manual edits.
Jorge F.Inbound Sales ManagerThunderbit’s AI Autofill is a lifesaver. After scraping contact info, I use it to fill lead forms directly in my browser. I just select the tab, and it fills everything using the scraped row. No manual input needed.
Alina D.Freelance ResearcherI rely on Thunderbit for extracting data from PDFs, image-based sites, and infinite scroll pages. It handles messy formats with AI and delivers ready-to-export tables I can send to Google Sheets or Airtable in seconds.
Taryn W.Growth Strategist@Thunderbit changed how I run competitor research. I click 'AI Suggest Fields,' and it builds a clean table across paginated results—no coding, no CSS. Huge time-saver when analyzing product data from long-tail marketplaces.
Miles T.Sales Development ConsultantI use Thunderbit to grab emails and phone numbers from directories. It extracts clean contact info in one click, and exporting to Sheets or Notion takes seconds. No extra setup, no coding—just usable data ready to work with.
Rhea C.E-commerce AnalystThunderbit helps me monitor SKU data across multiple pages. I scrape the listings, then use Subpage Scraping to pull full product specs, pricing, reviews, and stock. The AI organizes everything into columns I define.
Cassian B.Real Estate AdvisorThunderbit's Scheduled Scraper makes real estate tracking easier. I describe the interval in plain English, and it automatically pulls updated listings, prices, and links without touching the setup again. Simple and very practical.
Dorian B.Content & SEO SpecialistI use Thunderbit's Field AI Prompts to clean and tag scraped blog content. It extracts titles, authors, and even suggests categories. Works great across dynamic sites and subpages—perfect for building structured SEO datasets.
Lina K.Marketplace Operations LeadWe track SKUs from niche stores using Thunderbit. Cloud Scraping handles 50 pages at a time, and for login-required sites, we switch to browser mode. It’s fast, flexible, and doesn’t need ongoing maintenance or manual edits.
Jorge F.Inbound Sales ManagerThunderbit’s AI Autofill is a lifesaver. After scraping contact info, I use it to fill lead forms directly in my browser. I just select the tab, and it fills everything using the scraped row. No manual input needed.
Alina D.Freelance ResearcherI rely on Thunderbit for extracting data from PDFs, image-based sites, and infinite scroll pages. It handles messy formats with AI and delivers ready-to-export tables I can send to Google Sheets or Airtable in seconds.
Frequently Asked Questions
Extract Data using AI
Easily transfer data to Google Sheets, Airtable, or Notion
Chrome Store Rating
PRODUCT HUNT#1 Product of the Week