Check your photo against OnBuy's rules.
OnBuy sets rules for the main image that can be measured from the photo: background colour. Drop a photo to see which ones it meets. It runs in your browser; nothing is uploaded.
Choose a marketplace and a photo.
Rules come from each marketplace's own help pages, summarised in the guides (checked 12 October 2026). Size, file size and format are checked as well.
What OnBuy asks for.
Source: OnBuy — OnCommerce API Documentation v2 (Image Download Requirements; Content Scope); Seller Terms v3.0.0 · checked 12 October 2026
- Main image
- White background (recommended)
- Formats
- JPG, JPEG, PNG and GIF only
- Recommended
- 500 × 500 pixels for best results
- Maximum
- 1,000 × 1,000 pixels
- File size
- Maximum 10 MB
- Background
- White background colour where possible; the photographic quality must be high
- Image hosting
- Image URLs must be fully accessible over the public internet, without authentication, IP allowlisting, expiring signatures or token-based access; Imgur links are rejected
- Not allowed
- Product pages must not contain nude images or obscene or discriminatory content
- Shared across sites
- Default and additional image URLs are global content, shared across all OnCommerce sites such as OnBuy UK and OnBuy FR
- Processing
- Only the image URL is checked when a product is submitted; images are downloaded and processed when the product is actually created
How each rule is measured.
- Background colour
- The background colour is the median of a thin band along all four edges. A pure-white rule passes only when that band is RGB 255, 255, 255; near-white values such as 253 are reported with their exact colour.
- Scene photos
- Room and lifestyle photos have no plain background to measure against, so fill, edges and shadow are marked as not measured rather than guessed.
Checkers by marketplace.
OnBuy main images, answered.
What background does OnBuy require for the main image?
White background (recommended). The checker reads the background from the edges of the photo and reports its exact RGB value.
Where do these figures come from?
From OnBuy — OnCommerce API Documentation v2 (Image Download Requirements; Content Scope); Seller Terms v3.0.0, read on 12 October 2026. Marketplaces update their rules; the official page is the final reference.
Is my image uploaded?
No. The file is read and processed inside your browser; nothing is sent to a server.
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