Validated ePub 3.0, Kindle MOBI/AZW3, and print-ready PDF — tested on physical Kindle, Apple Books, Kobo, and all major platforms before we hand you the files. Zero errors, guaranteed.
Every deliverable, every detail — fully transparent, nothing hidden.
Fully validated ePub 3.0 with proper metadata, embedded fonts, clean TOC navigation, and reflowable layout. Passes Apple Books and Kobo validators without a single error.
Amazon-specific formatting with correct TOC structure, cover thumbnail, chapter navigation, and metadata. Tested on physical Kindle devices and the official Kindle Previewer tool.
Exact KDP Print and IngramSpark specifications — proper bleed, margins, embedded fonts, CMYK color. Approved on the first upload attempt, every time.
For children's books, cookbooks, and heavily designed books where layout must stay fixed across all devices. Fully compatible with Apple Books — tested and validated.
Have a broken ePub, corrupted Word document, or poorly converted file? We diagnose and repair any formatting issue — regardless of how it happened.
Every file tested on Kindle Paperwhite, Kindle App (iOS/Android), Apple Books, Kobo App, and Google Play Books before delivery. Zero surprises on launch day.
Simple process, clear milestones — you're in control at every stage.
Provide your final, approved Word document or Google Doc.
ePub, MOBI/AZW3, and print PDF produced simultaneously.
Every file tested on real hardware and official validators.
Complete file package delivered — ready to upload anywhere.
We don't just deliver files — we deliver results you can measure.
We test on physical Kindle Paperwhite, iPad, and Kobo hardware — not just software emulators. What you see is exactly what your readers get.
Standard formatting delivered within 24 hours of receiving your final manuscript. Rush formatting in under 8 hours for urgent launch deadlines.
If your file gets a validation error or is rejected by any platform after delivery, we fix it for free — within 2 hours, no questions asked.
I'd tried formatting my ePub myself and it kept failing Apple Books validation. ZS Den fixed the file in 3 hours and it went live the same day. Should have called them first.
ePub is the universal standard used by Apple Books, Kobo, Google Play, and most platforms outside Amazon. MOBI/AZW3 is Amazon's Kindle-specific format. We deliver both so you're covered on every single store without compromise.
Yes. We test on multiple Kindle generations including first-generation e-ink models. Our CSS degrades gracefully so your book renders correctly regardless of device age.
Absolutely. Complex layouts with images, tables, callout boxes, footnotes, and charts are our specialty. We use fixed-layout ePub where the design complexity requires it for perfect rendering.
A final, completely approved manuscript in Word (.docx) format, your cover image at minimum 2,560px height for Kindle, and any special formatting instructions. We handle everything from there.
Send us your manuscript today and receive publication-ready files in every format within 24 hours — tested, validated, and guaranteed to upload without errors.
Interior formatting that makes your book a pleasure to read — proper margins, chapters, fonts, and spacing for every output format.