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Automated EPUB Validation at Scale

Automated EPUB Validation at Scale

Publishing & Trade Leading Trade Publisher (anonymized)

Validating and remediating 5,366 EPUB titles against a fixed deadline through an automation-driven framework built for scale.

The Challenge

A leading trade publisher faced a CRASH-priority mandate: validate and remediate 5,366 EPUB titles within a fixed timeline that had no room to move. At that volume, manual review alone would have meant longer timelines and more inconsistency across the catalog.

Thousands of titles needed to move through validation together, on one deadline, not one at a time.

The Partnership

Six Red Marbles and the publisher worked through the scope and urgency of the mandate together, aligning early on a scalable, automation-driven approach to remediation.

The Strategy

Six Red Marbles built an automation-driven framework instead of converting every title individually.

  • Identify recurring structural errors across the catalog to target the fixes that mattered most.
  • Apply batch-level remediation built around those error patterns.
  • Reduce manual intervention at every stage of the workflow.
  • Preserve content integrity across all 5,366 titles.

Automation ran inside disciplined quality checkpoints throughout, keeping accuracy intact at scale.

What Six Red Marbles Designed and Delivered

Six Red Marbles built and ran an automation-first remediation workflow sized to the full catalog:

  • Automated validation and remediation workflow
  • Structured error pattern analysis
  • Batch-based correction scripts
  • Quality assurance checkpoints built to scale with the catalog

The Learning Experience

Across all 5,366 titles, readers experienced the same dependable formatting and structure, regardless of which title, device, or reading app they opened it in. That kind of consistency, at that volume, on that timeline, is what an automation-first framework makes possible.

The Impact

5,366Titles Validated
100%On-Time Delivery
0Deadline Overruns

All 5,366 titles were validated and delivered within the deadline, with meaningfully less manual effort than a title-by-title approach would have required.

Why It Matters

As publishing portfolios grow, scalable production depends on workflow intelligence, not just added headcount. This case shows how automation, built into a mature production process, lets publishers manage large content ecosystems predictably and reliably.

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Thanks to you and your team for sorting this out so quickly. I really appreciate it.

Penguin Random House UK — Ebury

This looks fantastic. Thank you for implementing the bespoke code and resolving the rendering issues.

Penguin Random House UK — Ebury

Thank you to the typesetting and design teams for their hard work. The results look fantastic, and we truly appreciate the patience and attention to detail.

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Hachette UK — Headline

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Little, Brown and Company

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Bloomsbury Publishing (US)

The team reviewed the file, and it looks fantastic. Thank you for the excellent work.

Walker Books UK

A beautiful piece of typesetting. Thank you.

Penguin Random House UK

We deeply appreciate the tremendous level of attention from your editorial team.

Grand Central Publishing