Amazon Thumbnail
Audit Tool
Upload your book cover and instantly preview it at every Amazon thumbnail size — from tiny mobile search results to full hero images. Know exactly how your design performs before you go live.
90%
of discovery via thumbnail
3×
more clicks with clear covers
0.3s
decision time on mobile
4 sizes
simulated simultaneously
1 Upload Your Book Cover
Drop your cover here or click to browse
JPG, PNG, WEBP — Any resolution accepted
2 Thumbnail Size Preview
Simulating actual Amazon pixel dimensions
Mobile List
46 × 70 px
Search Result
96 × 146 px
Product Detail
160 × 243 px
Hero / Zoom
260 × 395 px
3 Cover Analysis
Avg. Brightness
—
Saturation Score
—
Image Dimensions
—
Audit Verdict
Upload your cover to get a personalized audit verdict.
Why Thumbnail Size Matters
- Click-Through Rate: Covers with high-contrast typography receive up to 3x more clicks in search results.
- Mobile Dominance: Over 60% of Amazon browsing happens on smartphones, where your cover is just 46 px wide.
- Direct Sales Impact: A blurry thumbnail signals an unprofessional book and kills conversions instantly.
- Genre Recognition: Readers snap-judge genre by visual cues. If your cover is muddled at search scale, they scroll past.
Thumbnail Checklist
- Title is readable at the Search Result size (96 px)
- High-contrast typography — light text on dark bg or vice versa
- One dominant focal point — avoid cluttered compositions
- Cover pops on the shelf against grey competitor placeholders
- Image is minimum 1600 px tall for Amazon quality standards
- Genre mood is instantly recognisable at tiny sizes
Amazon Size Reference
| Context | Size |
|---|---|
| Mobile List View | 46 × 70 px |
| Desktop Search Result | 96 × 146 px |
| Product Detail Page | 160 × 243 px |
| Hero / Zoom View | 260 × 395 px |
| Recommended Upload | 2560 × 1600+ px |
Get a Cover That
Converts.
Professional book cover design built for thumbnails, genre impact, and sales. 3-day turnaround. Unlimited revisions.
Start My Cover Design → View Portfolio FirstPro Tips for a Thumbnail-Ready Cover
Hierarchy-First Typography
Your title must be the single dominant text element. Use a bold, clean typeface at maximum contrast. Subtitle and author name should be significantly smaller — they matter at the product page, not at search-result scale.
Maximum Contrast Ratio
Aim for a contrast ratio of at least 4.5:1 between your text and the background. Black on white, white on deep navy, or bright gold on black all work. Pastel-on-pastel looks elegant at full size but disappears at 96 px.
Single Focal Point
Every successful thumbnail has one clear "hero" element — a face, a weapon, a symbol. Busy compositions with multiple competing elements collapse into visual noise at small sizes. Simplify ruthlessly.
Genre-Signal Color
Readers pre-qualify books by color. Dark, muted palettes signal thriller or dark fantasy. Bright pastels signal romance or cozy mystery. When your thumbnail matches genre expectations, clicks increase dramatically.
Upload at High Resolution
Amazon recommends a minimum of 2,560 pixels on the longest side. Higher resolution ensures that even when Amazon compresses and resizes, your cover retains sharpness, color accuracy, and edge definition.
Test, Don't Guess
Never judge your cover only at full resolution. Always check the 96 px Search Result size — this is the exact size most Amazon shoppers see first. If they cannot read your title there, you are losing sales.
Is Your Cover Failing the Thumbnail Test?
Most self-published authors only discover their cover is illegible after it goes live. Don't lose those clicks. Let Nabin design a cover built for every size.
Common Questions
What Amazon thumbnail sizes does this tool simulate?
Is my cover image uploaded to any server?
FileReader API. Your cover image is never uploaded to or stored on any server.
It stays completely private on your device.
What resolution should I upload my cover at?
How is the brightness and saturation score calculated?
(0.299R + 0.587G + 0.114B).
Saturation is calculated from the HSL colour model. Scores are contextual guides — your
genre will determine what is "ideal."
