Marketplace image rules: United Kingdom.
Local marketplaces and their product image rules side by side: size, file limits and formats, each summarised from the marketplace's own page, with a free check for each. Open a marketplace for its full guide.
With Herofab Image size checker
Local marketplaces, side by side.
| Marketplace | At a glance | Free check | Herofab download size | Source |
|---|---|---|---|---|
| OnBuy | OnBuy product images: 500 × 500 pixels recommended, 1,000 × 1,000 maximum, up to 10 MB, JPG, JPEG, PNG or GIF, white background where possible. | Background colour | — | Official page |
| Folksy | Folksy listing photos: at least 1,000 pixels wide, square 1,000 × 1,000 main image recommended, JPG or PNG under 5 MB, up to 5 images per listing. | Image size checker | — | Official page |
The figures, as published.
| Marketplace | File-size limit | Format | AI images | Read on |
|---|---|---|---|---|
| OnBuy | 10 MB | JPEG · PNG · GIF | — | 12 October 2026 |
| Folksy | 5 MB | JPEG · PNG | — | 12 October 2026 |
— No rule found
Main image
- OnBuy
- White background (recommended)
Source: OnBuy — OnCommerce API Documentation v2 (Image Download Requirements; Content Scope); Seller Terms v3.0.0 · checked 12 October 2026
Not allowed
- OnBuy
- Product pages must not contain nude images or obscene or discriminatory content
Read on 12 October 2026
- Folksy
- Animated images in listings; on items featuring swear words, the main product image must be edited to cover up, block out or completely blur the vowel
Read on 12 October 2026
Ready before you list.
- Product photo checker
- OnBuy
- Marketplace image resizer
- OnBuy · 1,000 × 1,000 px
- Image compressor
- OnBuy · 10 MB
Folksy · 5 MB
Beyond one country.
Guides for marketplaces that are not tied to a single country. Each guide links to the marketplace's own page.
Worldwide
Europe
United Kingdom, answered.
Can I check my images before uploading?
Yes. The free image size checker reads each file in your browser and tests it against these rules; the image is not uploaded.
Where do these figures come from?
From each marketplace's own seller pages, linked in the table above; every guide shows the day its rules were read. Marketplaces update their rules; the official page is the final reference.
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