The short answer
On desktop, Amazon shows your description in a box exactly 280 pixels tall and hides everything below it behind "Read more". With Amazon's 14-pixel text on 20-pixel lines, that's about 14 lines. How many characters fit depends on your formatting: every paragraph break, heading and list uses up lines.
How we measured it
On 28 October 2026 we opened book pages on amazon.com and amazon.co.uk in Chrome on a desktop with a 1,920-pixel-wide window and measured the description panel directly in the page:
- The collapsed description box was 280 pixels tall on every book.
- The text column was 786 pixels wide.
- Amazon's text is 14 pixels on 20-pixel lines, in Amazon's own font with Arial as the fallback.
- We changed the width of the column to 600 and then 450 pixels: the box stayed 280 pixels tall. So the cut-off is a height, not a number of characters or lines of HTML.
For each book we then counted how many characters of text sat fully above the 280-pixel line.
The results
| Book | Characters before "Read more" | Line breaks in the description |
|---|---|---|
| Sapiens | 1,195 | 8 |
| The Midnight Library | 919 | 10 |
| Atomic Habits | 820 | 16 |
| The Silent Patient | 779 | 12 |
| Project Hail Mary (amazon.co.uk) | 747 | 22 |
The range is wide: from 747 to 1,195 characters. Books with more line breaks showed fewer characters, because each break and blank line takes a line of the 14 available. Any advice that gives a fixed character count for the fold will be wrong for most descriptions.
Amazon's spacing
We also measured how Amazon spaces each kind of formatting KDP allows, because it decides how much fits:
| Element | Text size | Height it uses |
|---|---|---|
| Normal text | 14 px | 20 px per line |
| Paragraph gap | 14 px after each paragraph (10 px between two in a row) | |
| Blank line (<br>) | 20 px | |
| Large heading (h4) | 18 px bold | 28 px |
| Medium heading (h5) | 14 px bold | 20 px |
| Small heading (h6) | 12 px bold | 17 px |
| List item | 14 px | 20 px per line, no gap after the list |
Note there's no gap after a heading or a list. If you want one, add a blank line.
What this means for your description
- Treat the first 14 lines as your sales pitch. The hook, who the book is for, and why it's different all need to be above the line.
- Every blank line costs you a line. Short paragraphs are easier to read, but a description with lots of one-line paragraphs shows less before the fold. Balance the two.
- A large heading costs about one and a half lines. One heading as a hook earns its space. Several headings near the top push your pitch below the fold.
- Opening sales claims push the pitch down. Atomic Habits opens with three lines of sales figures, which a bestseller can afford. Most authors are better off opening with the hook.
Check yours
Our book description formatter lays your description out at Amazon's width with Amazon's spacing and draws the "Read more" line, with a count of the characters above it. We checked it against Atomic Habits: the tool's line falls after the same sentence as Amazon's, at 819 characters against Amazon's 820.
What about phones?
We measured desktop only. The Amazon app and mobile site lay out text differently, with a narrower column, so the fold falls elsewhere. Once your book is live, look at the listing on your own phone.