Upload Your Variations
Add Thumbnail A and B, with an optional third design. Use 16:9 images for a representative video thumbnail preview.
Compare thumbnail designs, check small-screen readability, and preview how they may look beside other videos.
Upload your designs to compare them instantly.
Each variation has its own thumbnail and video title. The details below stay the same for all variations.
Images stay in your browser. No YouTube account, upload, or external API is required.
Side-by-side thumbnail comparison
Compare thumbnails at the same display size. Use the small-size row to inspect text and visual clarity.
Export the current comparison or selected placement as a PNG.
YouTube Thumbnail Preview & A/B Comparator helps creators compare two or three thumbnail concepts before publishing a video. Upload each design, write a separate video title for every variation, and compare them at the same size with a shared channel name and duration.
Switch between a direct comparison and illustrative YouTube-style Home Feed, Search Results, and Suggested Videos layouts. The preview is a design planning tool, not an official YouTube experiment or a measurement of real viewer clicks.
Add Thumbnail A and B, with an optional third design. Use 16:9 images for a representative video thumbnail preview.
Compare designs side by side, switch between mobile and desktop, and inspect one thumbnail next to sample competing videos.
Check image dimensions, apply optional blur or grayscale tests, and save a PNG mockup of the selected view.
| Preview | Best For | What to Check |
|---|---|---|
| A/B Compare | Reviewing multiple thumbnail concepts | Contrast, subject clarity, and small-size legibility |
| Home Feed | Assessing visual competition on the homepage | Whether the thumbnail stands out among other videos |
| Search Results | Checking search-page presentation | Thumbnail, title readability, and surrounding metadata |
| Suggested Videos | Reviewing compact recommended-video cards | How quickly the main subject and message can be recognized |
Important: Side-by-side comparison is a visual review, not a live A/B test. This tool does not publish thumbnails, collect impressions, measure click-through rate, or decide which variation will perform better.
View each thumbnail at reduced width. Small lettering and overly detailed backgrounds may become difficult to distinguish on a phone.
Use a recognizable face, object, or central visual idea where appropriate. Make sure the subject does not blend into the background.
Give each variation its own title and thumbnail combination. Avoid repeating the same long message when a shorter visual cue communicates it faster.
Yes. Upload Thumbnail A and B, give each a separate title, and compare them at equal sizes. You can also add a third variation or swap A and B together.
No. It is an independent visual comparison tool. Real A/B experiments require exposure to actual viewers and platform performance data.
Yes. Use the device switch to compare different preview widths and context layouts.
Yes. Select Search Results to see your selected thumbnail alongside illustrative video results.
The Home Feed, Search Results, and Suggested Videos modes include fictional sample video cards for visual comparison. They do not retrieve live YouTube results.
Yes. It reports pixel dimensions and whether the ratio is close to 16:9, and flags relatively small images. You can also use the blur and grayscale visual tests.
A 16:9 image, commonly 1280 × 720 pixels or higher, is a practical starting point for standard horizontal videos.
No. Actual click-through rate depends on the audience, video topic, distribution, and other factors that a visual preview cannot measure.
No. Images are loaded locally in your browser. This tool does not transmit them to ApiSeller or YouTube.
Yes. Download PNG Preview exports an illustrative mockup of your currently selected preview layout.
No. It is an independent design planning tool and is not affiliated with YouTube.