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Eugene Schwartz was a prodigy. He wrote "Breakthrough Advertising" when he was just 29 years old. He wasn't a theorist; he was a practitioner. He wrote the famous "Stanley Tools" campaign, generated millions of dollars in an era when that was unfathomable, and then distilled his process into 200 pages of laser-focused genius.
So, why is the PDF so popular?
However, a word of caution: While a Breakthrough Advertising by Eugene Schwartz PDF is floating around the internet (often scanned poorly with missing pages), reading it as a scanned image on a screen is a disservice to the work. The book is dense. You need to highlight, margin-note, and dog-ear the pages. Consider purchasing the authorized digital edition or paying for a reprint to support the legacy of this craft.
These people know "SEO software" exists, but they don't know your software. They know the "what" but not the "which."
When the iPhone launched, the market was at Level 3 (Mass Market for phones) but Level 1 (Unaware for touch screens). Schwartz would argue that Apple didn't sell a "phone." They sold a "revolutionary communication device." They moved the market backward to generate new desire.
The prospect knows about your product, but isn't sure if it's right for them or if it works as promised.