--- title: "OnBuy main image checker — free, in your browser | Herofab" description: "Check a product photo against OnBuy's main-image rules: background colour. Free, in your browser; nothing is uploaded." url: https://herofab.app/tools/onbuy-product-photo-checker language: en updated: 2026-10-12 --- # 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. ![The brown leather tote alone on a white studio background, front view](https://herofab.app/img/ex/tote-packshot-1100.webp) Made with Herofab · Packshot studio ## Choose a marketplace and a photo. Rules come from each marketplace's own help pages, summarised in the [guides](https://herofab.app/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](https://docs.api.onbuy.com/) · 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 [OnBuy image guide](https://herofab.app/guides/onbuy-image-requirements) · [Product photo checker](https://herofab.app/tools/product-photo-checker) · [OnBuy image resizer](https://herofab.app/tools/onbuy-image-resizer) ## 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. [Amazon](https://herofab.app/tools/amazon-product-photo-checker) · [Google Shopping](https://herofab.app/tools/google-shopping-product-photo-checker) · [Zalando](https://herofab.app/tools/zalando-product-photo-checker) · [Walmart](https://herofab.app/tools/walmart-product-photo-checker) · [Etsy](https://herofab.app/tools/etsy-product-photo-checker) · [TikTok Shop](https://herofab.app/tools/tiktok-shop-product-photo-checker) · [Kaufland](https://herofab.app/tools/kaufland-product-photo-checker) · [OTTO](https://herofab.app/tools/otto-product-photo-checker) · [Galaxus](https://herofab.app/tools/galaxus-product-photo-checker) · [Mercado Livre](https://herofab.app/tools/mercado-livre-product-photo-checker) · [Faire](https://herofab.app/tools/faire-product-photo-checker) · [Shopee](https://herofab.app/tools/shopee-product-photo-checker) · [Allegro](https://herofab.app/tools/allegro-product-photo-checker) · [Hood.de](https://herofab.app/tools/hood-de-product-photo-checker) · [CDON](https://herofab.app/tools/cdon-product-photo-checker) · [Fyndiq](https://herofab.app/tools/fyndiq-product-photo-checker) · [Cdiscount](https://herofab.app/tools/cdiscount-product-photo-checker) · [Ricardo](https://herofab.app/tools/ricardo-product-photo-checker) · [Heureka](https://herofab.app/tools/heureka-product-photo-checker) · [GLAMI](https://herofab.app/tools/glami-product-photo-checker) · [Best Buy Canada](https://herofab.app/tools/best-buy-canada-product-photo-checker) · [Facebook & Instagram Shop](https://herofab.app/tools/facebook-instagram-shop-product-photo-checker) · [Miinto](https://herofab.app/tools/miinto-product-photo-checker) · [Vinted](https://herofab.app/tools/vinted-product-photo-checker) · [Vestiaire Collective](https://herofab.app/tools/vestiaire-collective-product-photo-checker) · [Tokopedia](https://herofab.app/tools/tokopedia-product-photo-checker) · [Tiki](https://herofab.app/tools/tiki-product-photo-checker) · [Coupang](https://herofab.app/tools/coupang-product-photo-checker) · [Newegg](https://herofab.app/tools/newegg-product-photo-checker) · [Wolf & Badger](https://herofab.app/tools/wolf-badger-product-photo-checker) · [noon](https://herofab.app/tools/noon-product-photo-checker) · [Falabella](https://herofab.app/tools/falabella-product-photo-checker) · [Fruugo](https://herofab.app/tools/fruugo-product-photo-checker) · [ZALORA](https://herofab.app/tools/zalora-product-photo-checker) ## 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](https://docs.api.onbuy.com/) is the final reference. **Is my image uploaded?** No. The file is read and processed inside your browser; nothing is sent to a server.