NINJA ePUB Accelerator: Fast, Accurate, Accessible ePUB at Scale
The NINJA ePUB Accelerator replaces slow, error-prone manual conversion with an intelligent, automated engine that produces reflowable ePUB3 files that are accurate, accessible, and ready for distribution.
Over 10 million pages produced and counting.
THE PROBLEM
Manual ePUB Conversion Does Not Scale
Publishers converting large volumes to ePUB know the pain. Files go in, errors come out, and fixing them takes longer than the conversion itself. Inconsistent tagging, broken reading order, inaccessible images, and format-specific issues in complex content all compound into delays and quality failures.
The NINJA ePUB Accelerator eliminates this. It handles conversion complexity through a validated automated pipeline, with human oversight at the points that matter.
HOW IT WORKS
A Precision-Engineered Conversion Workflow
Every ePUB produced by the Accelerator passes through six sequential stages:
1. Extraction
High-fidelity text, image, and table extraction that preserves semantic relationships and handles complex layouts and multicolumn formats accurately.
2. Correction
Automated flagging and correction of linguistic and formatting issues, including spelling errors, special character normalisation, and problematic word hyphenation.
3. Structuring
Intelligent element tagging: headers, lists, block quotes, paragraphs, running headers, footers, marginalia, and table captions are all identified and tagged correctly.
4. Styling
Dynamic CSS generation that separates styling from the PDF’s fixed layout, creating clean, lightweight, and fully reflowable content.
5. Hyperlinking
Automated linking for all navigational elements: Table of contents, footnotes, endnotes, figure and table cross-references, and index terms.
6. Generation
Final assembly into a valid, standards-compliant ePUB (ePUB2 or ePUB3), ready for immediate distribution across all major retail platforms.
KEY BENEFITS
Why Publishers Choose the NINJA ePUB Accelerator
Speed
Production cycles are cut from weeks or days to hours. Automated validation removes the back-and-forth of error correction, getting titles to market faster.
Accuracy
99.995% text accuracy, eliminating common conversion errors: incorrect hyphenation, special character corruption, formatting inconsistencies, and font rendering issues.
Built-in Accessibility
Every ePUB meets WCAG 2.1 AA and EPUB Accessibility 1.0 standards at the point of conversion. No separate remediation step required.
COMPLIANCE
Accessible ePUBs
Are Now a Legal Requirement
EAA - June 2025/ADA Title II compliance has been extended to April 26, 2027 for larger public institutions and April 26, 2028 for smaller jurisdictions.
The NINJA ePUB Accelerator makes this the default on every title, for every delivery - meeting WCAG 2.1 AA and EPUB Accessibility 1.0 standards from the point of creation.
ACCESSIBILITY CONFORMANCE SERVICES
NINJA Accessibility Conformance Services for Web Platforms and LMS
S4Carlisle helps publishers, institutions, and edtech vendors demonstrate accessibility conformance for their digital properties, with a focus on Learning Management Systems and digital courseware. Our services cover hybrid audits, VPAT 2.5, ACR documentation, and WCAG 2.2 AA conformance.
Our Hybrid Methodology
Automated: axe-core plus, our multi-tier engine, checks every page and interaction against all WCAG 2.2 Level A and AA success criteria. Manual: experienced specialists verify what automation cannot catch, including meaningful sequence; caption quality; and screen-reader behaviour on NVDA, JAWS, and VoiceOver. Interaction testing: login, navigation, forms, quizzes, and media are exercised via keyboard, screen reader, and mouse paths.
Deliverables
1. Detailed Audit Report (Excel): findings mapped to WCAG, with element identification, fix guidance, and owner routing.
2. Accessibility Conformance Report (ACR): ready for procurement and Section 508 disclosures.
3. VPAT 2.5 (WCAG 2.2 AA): per-criterion conformance in the current ITI template.
4. Remediation guidance: prioritised fixes with re-audit available on request.
Engagement Models
Single platform audit. Per-title courseware audits. Ongoing monitoring with release-diff reviews. Vendor VPAT authoring. We work with you to find the model that fits your programme and budget.
KEY OUTCOMES
What to Expect
01
10 million+ pages produced
across academic, educational, STM, and trade publishing programmes.
02
Hours, not weeks
production cycle time reduced significantly through intelligent automation.
03
Compliance from day one
WCAG 2.1 AA and EPUB Accessibility 1.0 on every output.
04
Any volume, consistent quality
from a single title to a full backlist program.
WHO IS IT FOR