Why Your KDP Book Description Looks Great But Your Product Description Doesn't
Published 2026-09-14
Two different Amazons, two different rulebooks
Sellers who publish both books (via KDP) and physical products (via Seller Central) often assume Amazon's HTML formatting rules for descriptions are the same everywhere. They aren't — and the two rulebooks moved in opposite directions.
KDP book descriptions: HTML still works
Typed directly into the KDP book description field (not through the rich-text toolbar, which tends to insert unwanted markup), Amazon still supports a real set of formatting tags: bold, italic, underline, line breaks, paragraphs, headings restricted to <h4> through <h6>, and both bulleted and numbered lists — all within a 4,000-character budget that includes the tags themselves.
Regular product descriptions: HTML mostly stopped working in 2021
Standard Seller Central product descriptions used to accept similar formatting tags, but Amazon announced that after July 30, 2021 it would stop rendering them. Today, only line breaks survive; bold, italics and lists you paste in either get stripped or show up as raw, unrendered text — which can look worse than plain text with no formatting attempt at all. Getting real formatting on a regular listing now requires Amazon's A+ Content feature, gated behind Brand Registry enrollment.
The costly mix-up
The failure mode goes both ways: authors who paste plain, un-formatted text into a KDP description miss out on legitimate, still-working formatting that would make their blurb easier to skim. Sellers who paste HTML formatting into a regular product description (based on outdated advice, or a memory of how it used to work) end up with a listing full of visible, broken-looking tag remnants.
Format the right way for the right field
Our Book Description HTML Formatter has a toggle for exactly this distinction — type your description once using simple markup, pick which Amazon field you're targeting, and get output (plus a warning if you're about to lose formatting) that matches what that specific field actually renders.