Amazon Main Image Normalizer
Amazon's main image rules are strict, and a rejected image means a delayed or suppressed listing. This free tool measures your image against Amazon's published requirements and normalizes it in place — entirely inside your browser. No upload, no watermark.
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white background normalization · square padding · 85% fill check · 100% in-browser
What This Tool Checks
Amazon's main image rules are strict, and a rejected image means a delayed or suppressed listing. This free tool reads your image, measures it against Amazon's published main image requirements, and normalizes it in place — all inside your browser. It checks five things and shows you the numbers:
- Pure white background. Detects off-white or gray pixels around the product and normalizes them to pure white (#FFFFFF).
- Fill the frame (85%+). Measures the subject's bounding-box area as a share of the square canvas — our reading of Amazon's "fill the frame" rule.
- Square, 500px+. Pads the image to a square and reports whether the longest side clears Amazon's 500px upload floor and 1000px zoom threshold.
- Format and size. Exports JPEG in sRGB and reports the exported file size against Amazon's 10MB cap.
- Confidence. Tells you how sure the analysis is, so you know when to eyeball it yourself.
No account, no upload, no watermark. Your image bytes never leave your device.
Your Privacy Is the Point, Not the Pitch
- Your images never leave your browser. No upload, no cloud API, no CDN round-trip — all processing runs locally via Canvas and Web Worker.
- We only fetch our own JavaScript (
listing.js/jszip) on first use. That loads code, it does not upload your image. - No cookies, no tracking. Only CDN edge analytics (Cloudflare, zero on-page script). You can verify this yourself in your browser's Network tab.
What This Tool Does Not Do
- Does not guarantee Amazon's editorial acceptance (style and quality review). It checks technical attributes only.
- Does not perform AI background removal for non-white backgrounds — it normalizes an existing white (or near-white) background to pure white.
- Does not upscale low-resolution images (enlarging only softens pixels).
- Does not add or detect text/logo compliance — that is a planned v1.1 feature.
- Does not alter the product beyond white-background normalization, square padding, and EXIF stripping.
Based on Amazon's published main image requirements (last reviewed 2026-10-24). Always confirm in Seller Central.
Amazon Main Image Requirements at a Glance
Amazon's product image standards for the main (primary) image are non-negotiable. Here is the checklist this tool measures against:
| Requirement | Rule | Why it matters |
|---|---|---|
| Background | Pure white (#FFFFFF, RGB 255,255,255) | Consistent catalog rendering and buy-box display |
| Fill | Subject occupies at least 85% of the image area | "Fill the frame" — product should dominate |
| Shape | Square (1:1) | Uniform grid across the catalog |
| Resolution | Longest side at least 500px (1000px+ for zoom, 1600–2000px recommended) | Enables zoom without pixelation |
| Format | JPEG, sRGB, baseline, under 10MB | Universally decodable, fast to load |
| Content | No text, logo, watermark, or props | Only the product on white |
Source: Amazon Seller Central product image standards (Seller Central help, last reviewed 2026-10-24).
Why the Background Must Be Pure White
Amazon renders millions of products in a uniform grid. A pure white background is what makes that grid look like one catalog rather than a scrapbook. Beyond aesthetics, it is a hard technical requirement: Amazon's systems and the buy-box interface assume white, and off-white or gradient backgrounds are a common reason for image suppression.
Our tool does not just detect a non-white background — it normalizes it. Pixels that fall within the tolerance band around white are set to exact #FFFFFF, while the product itself is left untouched. The result is a background that passes automated checks without altering your product.
How "85% Fill" Is Actually Measured
This is where most "compliance checkers" get vague. We read Amazon's "fill the frame" rule as the image area:
fill % = (subject box width × subject box height) ÷ (canvas side × canvas side)
Why area and not the longest edge? A cable shot as a 300×1000 strip on a 1000px square spans 100% of the longest edge, so a longest-edge reading would call it compliant — yet in the catalog it still looks like a thin object floating in white. Area catches that: 30% of the frame, and it fails. The trade-off cuts the other way too: because the bar is set on area, a roughly square product has to span about 92% of the frame to clear it, which is stricter than a longest-edge reading would be. The dashboard shows your input fill next to your normalized fill, and the CSV report exports both the longest-edge and the area number so you can compare the two readings yourself.
Size and Resolution
Amazon's hard upload floor is 500px on the longest side, and 1000px+ enables the zoom function (1600px+ recommended for the best zoom). 1600–2000px is the sweet spot: large enough for zoom, small enough to stay under the 10MB limit. If the exported square is below 500px on a side, the tool flags it as not compliant and recommends a re-shoot; between 500–999px it is uploadable but won't zoom, so the tool still notes a larger source is recommended — it will never upscale, because enlarging pixels only produces a softer, still-rejected image.
If your source is larger than 2000px, the tool downsamples to keep file size and processing time reasonable, then pads to a square. The product is never cropped in the default mode.
Format and File Size
The correct export is JPEG in the sRGB color space, baseline (non-progressive), under 10MB, square. We strip all metadata on export — including GPS, camera model, and any EXIF — so nothing about your shoot leaks into the file. AVIF inputs are re-encoded to JPEG on export, since Amazon's uploader expects JPEG/PNG.
The Five Most Common Rejections
- Background not pure white. Gray, cream, or gradient backdrops are the #1 reject.
- Product too small in frame. Under 85% fill looks like a thumbnail floating in white space.
- Non-square image. A 4:3 or portrait shot breaks the catalog grid.
- Resolution too low. Longest side under 500px is rejected; under 1000px loses zoom.
- Text or logo in frame. Even a tiny brand mark on the product-adjacent area can trigger a review.
Category Differences Worth Knowing
Apparel on a flat lay
Laid-flat clothing should fill the frame edge to edge on white. Wrinkles and shadows count as non-white — steam or shoot flat to keep the background clean.
Jewelry and small items
Macro shots often have shallow depth of field; keep the product centered and large. A tiny item on a big white field fails the 85% fill rule.
Electronics with screens
A lit screen is part of the product and is fine, but turn off any UI text overlays that read like marketing copy.
Books and media
Front cover only, squared to the spine, no "book mockup" 3D effects — Amazon wants the flat cover on white.
Secondary Images (Additional Views): The Rules That Actually Apply
Amazon's strictest image rules — pure white background, 85% fill, no text or props — are written for the main image only. The additional-view slots (PT01–PT08) follow a looser set of rules, and treating them like main images is why sellers over-process them. This tool's "Secondary images" output target runs that looser pipeline: it measures, squares, and names each file for its PT slot, and it never forces a white background.
What Amazon requires on secondary images
| Rule | Applies to | What this tool does |
|---|---|---|
| Pure white (#FFFFFF, RGB 255,255,255) | Main image — required. Secondary images — recommended, not required. | Main: normalizes to pure white. Secondary: keeps your original background. |
| No text, logo, watermark, or props | Main image — no exceptions. Secondary images — no logos or watermarks; infographics with short text are accepted. | Neither role adds or removes content; infographics pass through untouched. |
| Subject occupies at least 85% of the image area | Main image only — Amazon states no fill rule for additional views. | Main: gates on 85% area. Secondary: fill is reported, never gated. |
| Longest side at least 500px (1000px+ for zoom, 1600–2000px recommended) | Both roles — the same floor and zoom threshold apply to additional views. | Both roles flag anything under 500px as not compliant; under 1000px is noted as zoom-less. |
A slot plan that answers buyer questions
Amazon's own guidance is to use additional images for angles, in-use shots, and details the main image cannot show. A common plan: PT01 a second angle, PT02 a close detail, PT03 a scale or in-hand shot, PT04 a lifestyle or in-use scene, PT05 a feature infographic, PT06–PT08 what's in the box, variants, or care instructions.
Batch-export with the "Secondary images" target selected and each file is named {ASIN}.PT01.jpg … {ASIN}.PT08.jpg — the exact names Amazon's inventory template expects, with the role recorded in the CSV report.
Source: Amazon Seller Central product image standards (Seller Central help, last reviewed 2026-10-24).
Frequently Asked Questions
Why does Amazon require a pure white background?
Amazon's product image standards require the main image background to be pure white (#FFFFFF, RGB 255,255,255) so products render consistently across the catalog and the buy box. Our tool detects off-white background pixels and normalizes them to pure white.
How is 85% fill measured?
We read Amazon's "fill the frame" rule as image area: the subject's bounding-box area divided by the square canvas area must be at least 85%. We chose area over the longest edge because a long, thin product — a cable, or a bottle shot as a 300×1000 strip — can span 100% of the longest edge while covering only 30% of the frame, and that still reads as a thin object floating in white. Area catches it. The CSV report exports both numbers so you can compare the two readings yourself.
What is the minimum image size?
Amazon's hard upload floor is 500px on the longest side, and 1000px+ enables the zoom function (1600-2000px recommended). If the exported square image is below 500px on a side, we flag it as not compliant - and we never upscale, because enlarging pixels only softens the image.
What output format and file size?
JPEG in the sRGB color space, baseline (non-progressive), under 10MB, square. We strip all metadata including GPS on export.
Do my images leave my browser?
No. All processing runs locally in your browser via Canvas / Web Worker. Image bytes are never uploaded, sent to a cloud API, or returned through a CDN. We only fetch our own JavaScript on first use.
What rules apply to secondary (additional-view) images?
Amazon's pure white background and 85% fill rules are written for the main image only. Additional-view images (PT01–PT08) may keep a lifestyle background — white is recommended, not required — but they must still be at least 500px on the longest side (1000px+ for zoom) and must not contain logos or watermarks. Switch the output target to "Secondary images" and the tool measures and names each file for its PT slot without forcing a white background.