AI tools are transforming self-publishing by automating e-book formatting. However, these powerful assistants can introduce subtle glitches that cause validation failures or poor reading experiences. This guide provides a concise troubleshooting workflow for the most common AI-generated errors.
Step 1: Validate Your File
Before deep-diving into code, use dedicated validators. For ePub, run your file through the free epubcheck tool or an online validator. For KDP, use the Kindle Previewer’s Validate button. For PDFs, utilize preflight tools in Adobe Acrobat Pro. These will flag critical structural issues.
Step 2: Check for Consistency
AI can create inconsistent styling. Ask: Are all chapter titles using the *exact same* paragraph style (e.g., “Heading 1”)? Are all blockquotes uniform? Are section breaks represented by a unique, consistent style (e.g., “SceneBreak”)? Inconsistency is a primary source of visual errors.
Step 3: Hunt Problematic CSS
AI often copies experimental or print-specific CSS from source documents. First, remove vendor prefixes like -webkit- or -moz-; Amazon’s engine doesn’t need them. Second, eliminate any fixed-layout code. A major symptom is a KDP upload failure citing fixed-layout content in a reflowable file. Target any element with a pixel-based width or height that isn’t an image. For multi-column text, avoid CSS columns; use clear paragraph breaks instead.
Step 4: Diagnose Image Errors
Image issues fall into three categories. For Huge files, the AI embedded an uncompressed photo—manually resize and compress. For Misaligned images, the AI likely used float or absolute position, which breaks reflowable text; replace with simple centering. For Missing images, the AI failed to embed the file correctly; check file paths in the ePub package.
Step 5: Isolate Stubborn Glitches
For unexplained line breaks, odd spacing, or persistent validation errors, isolate the CSS. Find the suspect class (e.g., .chapter-intro). Comment it out completely in your stylesheet, then re-convert. If the problem disappears, the issue is within that CSS rule. Also, search for stray CSS classes that don’t match your stylesheet and remove them.
For a comprehensive guide with detailed workflows, templates, and additional strategies, see my e-book: AI-Assisted E-book Formatting for Self-Publishers.