Editorial methodology
How Image Requirements Are Verified
Image Spec Check separates source-backed marketplace limits from practical export recommendations and visual policies that still require human review.
How are sources selected?
Primary platform documentation is preferred, including marketplace help centers, seller documentation, policy pages, category guides, and official creator support pages. Third-party image checker sites are not used as the authority for platform limits.
What do the requirement labels mean?
- Official
- The value is explicitly stated in a linked primary platform source.
- Recommended
- The value is a practical working or export target and is not presented as a hard marketplace limit.
- Manual review
- The item depends on visible image content, policy interpretation, region, category, account, or upload surface.
How often are requirements reviewed?
Each platform page displays a real last-verified date. That date changes only after the linked primary sources have been checked. Marketplace rules can change between reviews, so unusual or high-risk listings should also be confirmed in the official documentation linked from the relevant page.
Which checks are automatic?
The browser reads image width, height, aspect ratio, MIME format, and file size. Those measured values are compared with the selected platform registry. Background color, text, watermark, border, product fill, subject placement, and marketplace approval are not automatically certified.
How are uploaded images handled?
Preview and metadata analysis happen in the browser. When a user requests an export, the image is sent to the server for in-memory Sharp processing and returned with a no-store response. The application does not create a public upload URL or persist the original image.
How should a correction be reported?
A useful correction should identify the affected page, quote the conflicting requirement, link to a primary platform source, and include the date the source was checked. A public correction form is not currently available, so no correction submissions are collected through this site.
What does a passing result mean?
A pass means the measurable file properties satisfy the rules currently represented in the registry. It does not guarantee platform acceptance, search visibility, listing approval, or an AI citation.