The Complete Guide to Selling on OnBuy in 2026

## Why Sell on OnBuy? OnBuy has established itself as one of the fastest-growing marketplaces in the UK, offering sellers a genuine alternative to the dominant platforms. Unlike some competitors, OnBuy does not sell its own products, which means you are never competing against the marketplace itself. This creates a fairer environment for third-party sellers and gives every listing an equal opportunity to succeed. With millions of active buyers and a growing international presence, OnBuy represents a significant revenue channel for UK-based retailers and international sellers alike. The platform continues to invest heavily in buyer acquisition, which means more traffic to your products without additional marketing spend on your part. ## Setting Up Your OnBuy Seller Account Getting started on OnBuy is straightforward. Visit the OnBuy Seller Centre and register for a seller account. You will need to provide your business details, VAT number (if applicable), and banking information for payouts. OnBuy supports both individual and business seller accounts, though business accounts unlock additional features and higher trust signals to buyers. Once registered, you will gain access to the OnBuy Seller Centre, your central dashboard for managing listings, orders, and performance metrics. Take time to complete your seller profile fully, including a professional company description and logo. A complete profile builds buyer confidence and can improve your conversion rate. ## Listing Your Products OnBuy uses a catalogue-based listing system. This means you search for existing products in the OnBuy catalogue and attach your offer (price, stock quantity, condition, and delivery details) to the matching product page. If your product is not already in the catalogue, you can create a new listing from scratch by providing the product title, description, images, category, and relevant attributes. When creating new listings, invest time in writing clear, keyword-rich product titles and detailed descriptions. High-quality images from multiple angles significantly improve click-through rates. Include all relevant product specifications such as dimensions, materials, and compatibility information to reduce returns and buyer queries. For sellers with large inventories, OnBuy supports bulk uploads via CSV files and integrations with popular listing tools. This makes it practical to manage hundreds or even thousands of SKUs efficiently. ## Understanding OnBuy Fees One of the most attractive aspects of selling on OnBuy is the transparent fee structure. OnBuy charges a category-based commission on each sale, which typically ranges between 5% and 9% depending on the product category. There is also a small payment processing fee applied to each transaction. Unlike some other marketplaces, OnBuy does not charge insertion fees for listing products, so you can list your entire catalogue without upfront costs. This makes it a low-risk platform to test new products and categories. For a detailed breakdown, see our guide on [OnBuy fees explained](/blog/onbuy-fees-explained). ## Shipping and Fulfilment OnBuy gives sellers flexibility in how they fulfil orders. You can handle shipping yourself, use a third-party logistics provider, or take advantage of OnBuy's partnerships with delivery services. When setting up your listings, you define your delivery options including standard, express, and next-day delivery where applicable. Timely dispatch is critical to your seller performance. OnBuy expects sellers to dispatch orders within the timeframe specified in their delivery settings. Late dispatches negatively impact your seller metrics and can result in reduced visibility on the platform. Consider setting realistic delivery windows that you can consistently meet, even during peak trading periods like Black Friday and Christmas. ## Seller Metrics and Performance OnBuy monitors several key performance indicators for sellers, including dispatch time, cancellation rate, and customer feedback scores. Maintaining strong metrics is essential because they directly influence your eligibility for the buy box and your overall visibility in search results. Respond to buyer messages promptly, ideally within 24 hours. Handle returns and refunds fairly and efficiently. Consistent positive experiences lead to strong reviews, which in turn drive more sales. Think of your seller metrics as a reputation score that compounds over time. ## Tips for Success on OnBuy **Price competitively.** OnBuy buyers are value-conscious. Use a repricing tool like [Re-Pricer](https://re-pricer.com) to automatically adjust your prices based on competitor activity, ensuring you remain competitive without constantly monitoring the market manually. **Expand your catalogue.** The more products you list, the more opportunities you have to capture sales. Look for gaps in the OnBuy catalogue where demand exists but supply is limited. **Monitor your analytics.** The OnBuy Seller Centre provides sales data and performance reports. Review these regularly to identify your best-selling products, seasonal trends, and areas for improvement. **Optimise for the buy box.** On product pages with multiple sellers, winning the buy box is the key to capturing the majority of sales. Competitive pricing, strong seller metrics, and reliable delivery all contribute to buy box eligibility. Read our guide on [how to win the buy box](/blog/how-to-win-the-buy-box-on-marketplaces) for detailed strategies. **Stay informed.** OnBuy regularly updates its seller policies and introduces new features. Subscribe to seller newsletters and check the Seller Centre for announcements to stay ahead of changes that could affect your business. ## Getting Started Today Selling on OnBuy in 2026 is a genuine opportunity for retailers of all sizes. The combination of fair competition, transparent fees, and a growing buyer base makes it an attractive channel to diversify your online sales. Whether you are an experienced marketplace seller or just starting out, the steps above give you a solid foundation for building a profitable OnBuy business.