Author Resources

Practical guidesfor indie authors.

Straight answers on KDP, formatting, covers, ISBNs, audiobooks and editing from the Opus team.

Book Cover Design

Book Cover Thumbnail Test: Does Yours Pass?

Run the book cover thumbnail test the way shoppers see it, in a real store grid and in grayscale, then fix the one element that failed first.

Author Marketing

KDP Keywords: What to Put in All Seven Boxes

KDP keywords belong on what your title and categories miss. See Amazon's five keyword types, what KDP keeps out of the boxes, and how to test a phrase.

Audiobook Production

Prepare Your Manuscript for Audiobook Narration

What to cut, what to mark and what to send when you prepare a manuscript for audiobook narration, plus the ACX rules that shape your script.

Audiobook Production

ACX Audio Requirements Explained in Plain English

The ACX audio requirements in plain English: RMS, peak, noise floor, room tone and MP3 settings, what each one means and the order to fix them in.

Manuscript Formatting

Book Trim Size: How to Choose Before You Format

Choose your book trim size with confidence: KDP's page count limits by ink and paper, the large trim cost boundary, and what locks after you publish.