In your affiliate LemonSqueezy account, copy your affiliate link directly in the YouTube description, comments or on another platform like X.
Log in to your LemonSqueezy account.
In Affiliate Hub - Creatives.
Click on text.
And under, Embed code, copy your affiliate link.
Promote Chrome extension, ProThumbnailPreview, with your code for 50% OFF (which you will receive after registration). In the description of the video and comment (pin), you can use this text (just put your code and affiliate link), and you're ready!
In video description
Stop guessing if your thumbnail works! 50% OFF today, pay once, use forever, Pro Thumbnail Preview, with code [your-code]: [https://Your-Link] (ad)
In Pinned comment
Hi 👋 Use code ‘[your-code]’ for 50% OFF today, pay once, use forever, Pro Thumbnail Preview, [https://Your-Link] and stop losing views to hidden timestamps.(ad)
You sell "Confidence"
This is the "Pre-Publish Check". This is a Validation Tool. It’s a cheat code to boost CTR
You aren't promoting a AI tool. You are promoting certainty, speed, and visual proof that the packaging will get the click.
Creators fall in love with their own thumbnails and lose objectivity. They forget the fundamental rules of psychology and composition.
It doesn't replace a A/B test, but it helps you eliminate obviously bad options before you publish or start A/B testing. You save time, avoid wasted impressions, and protect your video's early momentum.
As you've probably noticed, everyone studies and emulates viral thumbnails and headlines. It's hard to know if you've truly "hit the vibe" of a viral video until you place your thumbnail right next to theirs. ProThumbnailPreview lets you insert your thumbnail directly beside the YouTube thumbnail you're emulating — for an instant "vibe check". If yours looks like the "poor cousin" of the viral one, you'll know immediately that your packaging (thumbnail or title) still needs work.
You can ask an AI for theoretical advice — I’ve done it myself.
But ChatGPT or any other AI, doesn't actually know what the live YouTube interface looks like or how your thumbnail looks on a phone in Dark Mode. It cannot show you if the YouTube timestamp is going to cut off your text.
Pro Thumbnail Preview, using its Live Preview and Mobile Scroll Simulator, places your thumbnail into its natural ecosystem.
The creator doesn't have to imagine how it will look next to MrBeast or Marques Brownlee — they see it physically on their screen.
Pro Thumbnail Preview isn’t an AI tool — it’s a visual simulator. AI tells you the contrast is good; Pro Thumbnail Preview physically proves through the Blur Test whether a viewer's eye will even notice your thumbnail while they are fast-scrolling their feed.
AI can recognize colors, but the Blur Test and Contrast Test from the Increase CTR framework rely on the biological function of the human eye.
When a creator hits the "Blur Test," they see with their own eyes whether the main subject blends into the background or "pops" out.
AI can write a description of that, but until a creator experiences it visually, they don't know exactly what needs fixing.
It is a visual laboratory, AI is just a text-based consultant.
Pro Thumbnail Preview isn’t just a tool. it’s a System.
The questions in the "Increase CTR" framework represent an unchanging, standardized test.
The creator knows they are following the same proven procedure every single time.
With ChatGPT, results are unpredictable. Depending on how you phrase a prompt today, the AI might give completely different advice than it did yesterday.
Creators crave consistency, and Pro Thumbnail Preview offers exactly that — a checklist that doesn't hallucinate or change its mind.
The focus is on context and the fact that a thumbnail never stands alone, but is always surrounded by competition.
Stop guessing.
Have you ever posted a video, got a bad CTR, and then frantically changed the thumbnail? That's because you haven't seen what he actually looks like in the feed. Our Live Preview gives you a superpower: A look into the future. Submit your idea directly to the YouTube page before you record a single second of video. If your thumbnail doesn't win this test, it won't win when you upload it either. Don't upload until you see your video dominating the screen next to your competition.
On smaller screens, text gets tiny, elements blur, and your video disappears in the feed. With the Mobile Scroll Simulator, you can check if your thumbnail actually survives the scroll, grabs attention and gets a click.
Blur Test
The 1.8-Second Test: Viewers don't analyze your image, they scan it. You have 1 seconds to grab attention. If your thumbnail isn't clear when it's blurry, it won't be noticed when it's sharp. Check what is the real focus of your image.
Contrast Test
Colors can lie. The human eye first registers the difference between light and dark, and only then color. If your text or face blends into the background in black and white, your thumbnail is unreadable on many screens. Good contrast ensures that the subject stands out clearly from the background, rather than looking "flat". Check if your design has the right "pop" effect. Colors are makeup, Contrast is the foundation.
Composition Test
The Rule of Thirds is commonly used for quick, efficient framing in both photography and film. Divides the image into nine equal parts, aiming for a simpler, more balanced, or sometimes "safer" composition. This rule guides the viewer's eye through the image in a more natural way, creating energy and tension instead of a static, centered frame. Effective tools for avoiding boring images. Applying the rule of thirds serves to create visual balance and direct the viewer's attention to key elements
If you have questions or need help, please contact us at: Email: prothumbnailpreview@gmail.com