#amazon
Practical guides for online sellers: product photos, marketplace listings, video ads and growing your store.
ACoS to ROAS (2026): Formula, Conversion Table and Break-Even
ROAS = 100 divided by ACoS%. A full ACoS-to-ROAS table, the reverse conversion, break-even points and a worked Amazon example.
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Amazon GTIN Exemption (2026): How to Apply, Photo Rules and Approval Time
Amazon's GTIN exemption process from its Seller Central help: eligibility, the photos that get approved, the four scenarios and how to list after approval.
Prime Day Product Images: What to Change, Image Rules, Sizes and Timing
What to change in your Amazon images before Prime Day and Prime Big Deal Days, what to leave alone, the size of every placement and a countdown plan.
Amazon Handmade Image Requirements (2026): Size, Background and Photo Slots
Amazon Handmade uses Amazon's standard image rules: a pure white main image, 1,000+ px for zoom, and lifestyle, scale and process shots in the other slots.
Amazon Hero Image Size (2026): Main Image, Brand Store and A+ Content
"Hero image" means three things on Amazon. The sizes and rules for the main product image, the Brand Store hero and the A+ Content header, side by side.
How Many Product Photos Per Listing? Limits and Shot List (2026)
Image limits and recommendations for each marketplace, what each photo should show, whether more photos help, and how to make extra images from one photo.
Product Color Variant Photos: Platform Rules, Shooting Tips and AI
How each platform links images to color variants, a quick way to photograph a full color range, when AI recoloring is reasonable, and how to keep colors accurate.
Amazon AI-Generated People Tag: What to Label and How (2026)
Amazon's July 2026 rule for AI-generated people in listing images, videos and A+ content: what needs the synthetic performer tag, how to add it, and the New York law behind it.
Amazon, Etsy and eBay Character Limits (2026): Titles, Bullets, Tags and More
Every listing field's limit on Amazon, Etsy and eBay in one table, which numbers are official, why Amazon counts search terms in bytes, and how to trim titles.
Do I Need a UPC Barcode to Sell Online? (2026 Guide)
Which channels require a UPC (Amazon, Walmart) and which don't (Etsy, Shopify), what GS1 charges, how Amazon's GTIN exemption works, and the risk of resold barcodes.
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