Listing optimisation, product imagery and multi-channel selling. Written to be useful to somebody actually doing the work — no listicles, no recycled 2018 advice.
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Amazon, Walmart, Etsy and eBay each enforce different field limits. The real numbers, which are hard caps, and why the maximum is never the target.
Etsy gives every listing thirteen tags of twenty characters. Most sellers fill six. How Etsy search reads them, and why empty slots cost reach.
Main image rules, the 85% frame guideline, the 1,600px zoom threshold, and the mistakes that get new listings suppressed before anyone sees them.
Amazon caps backend search terms at 250 bytes, not characters. Why that costs non-English sellers half the field, and how to use every byte.
Keyword placement, bullet structure, backend search terms, and how COSMO and Rufus changed what Amazon rewards. A practical guide, not a checklist.
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