AI tools dramatically speed up e-book formatting, but they can introduce subtle errors that cause validation failures or poor reading experiences. Here’s a targeted guide to diagnosing and fixing the most common AI-generated glitches.
1. Validation Failures: CSS & Fixed-Layout Issues
Symptom: KDP upload fails with messages about fixed-layout content in a reflowable file.
Cause: AI tools often insert pixel-based CSS (width: 500px;) on non-image elements, which KDP flags as fixed-layout. Also, watch for experimental CSS prefixes (-webkit-, -moz-) that Amazon’s engine doesn’t need.
Fix: Remove all pixel-based dimensions from text elements (use em or %). Strip out unnecessary CSS prefixes. Always run files through Kindle Previewer’s Validate button and epubcheck to catch these issues.
2. Inconsistent Styling & Hidden Code
Symptom: Unexplained line breaks, odd spacing, or text misalignment.
Cause: Inconsistent style application and leftover hidden code. Ask: Are all chapter titles using the *exact same* paragraph style? Are all blockquotes uniform? AI can create duplicate, conflicting styles.
Fix: Use a systematic audit. In your CSS, find a suspect class (e.g., .chapter-intro). Comment it out completely and re-convert. If the problem disappears, you’ve found the culprit. Also, manually search for and delete unused CSS classes.
3. Image-Related Glitches
AI often mishandles images in three ways:
Misaligned: AI uses float or absolute position from source layouts, which breaks in reflowable text. Replace with simple centering (text-align: center) on a containing block.
Huge: The AI embeds an original 5MB photo. You must manually resize and compress images before final conversion.
Missing: AI fails to embed the image correctly or uses a broken file path. Use ePub validators and check the ePub’s internal file structure.
4. Advanced Layout Pitfalls
Avoid complex CSS that AI might generate. For multi-column text, do not use CSS columns. Let the reader’s device control column count. Use clear paragraph breaks with consistent styling (e.g., a “SceneBreak” style) for visual separation instead.
For a comprehensive guide with detailed workflows, templates, and additional strategies, see my e-book: AI-Assisted E-book Formatting for Self-Publishers.