What does it mean when a PDF is flattened?

A flattened PDF has all its layers — text, images, vectors, and effects — merged into a single raster image per page. The text is no longer selectable or editable; it exists only as pixels.

Can you un-flatten a flattened PDF?

You cannot reverse flattening by opening the file in a PDF editor — but "flattened" usually means the design layers were merged for rendering, not that the text itself was destroyed. Most PDFs exported from Canva, InDesign, and similar tools still contain the original text as real, extractable text objects inside the PDF, even though the page renders as one flat image. MJ Convert Systems reads that embedded text and its coordinates directly from the PDF to produce a fixed-layout EPUB with genuine, positionally accurate text. When a PDF genuinely has no embedded text at all (for example, a scanned page), Reflowable EPUB mode falls back to OCR instead.

Why does OCR fail on flattened design PDFs?

OCR was built for scanned text documents, not designed pages. It produces ghosting artifacts, misidentifies decorative fonts, and cannot reconstruct multi-column layouts or image-text relationships.

Does Canva flatten PDFs by default?

Canva offers a Flatten PDF checkbox during export. When enabled, all layers merge into raster images. Even without flattening, Canva's PDF structure can be complex enough that standard converters struggle.

What is a Flattened PDF? (And How to Convert It for Kindle)

Flattened PDFs merge text and images into a single raster layer, making conversion difficult. Learn why standard OCR fails and how MJ Convert Systems recovers the PDF's own embedded text data for Kindle-ready EPUBs.

By Magnus | Published 2026-04-19 | Category: Guide

When a design tool exports a PDF, it can choose to keep text, images, and vector elements as separate layers — or merge everything into a single raster image. The second option is called flattening, and it is the root cause of most failed PDF-to-EPUB conversions.

Diagram showing PDF layers being flattened into a single raster image

Most PDFs exported from Canva, InDesign, and similar tools still contain the original text as real, extractable text objects even though the page renders as a single flat image. MJ Convert Systems reads that embedded text and its coordinates directly from the PDF — when a page genuinely has no embedded text, Reflowable EPUB mode falls back to Tesseract OCR instead. Choose Advanced Live Text Mode for EAA-aligned live text, or Visual Perfection Mode for image-perfect KDP pages.

Frequently Asked Questions

What does it mean when a PDF is flattened?: A flattened PDF has all its layers — text, images, vectors, and effects — merged into a single raster image per page. The text is no longer selectable or editable; it exists only as pixels.
Can you un-flatten a flattened PDF?: You cannot reverse flattening by opening the file in a PDF editor — but "flattened" usually means the design layers were merged for rendering, not that the text itself was destroyed. Most PDFs exported from Canva, InDesign, and similar tools still contain the original text as real, extractable text objects inside the PDF, even though the page renders as one flat image. MJ Convert Systems reads that embedded text and its coordinates directly from the PDF to produce a fixed-layout EPUB with genuine, positionally accurate text. When a PDF genuinely has no embedded text at all (for example, a scanned page), Reflowable EPUB mode falls back to OCR instead.
Why does OCR fail on flattened design PDFs?: OCR was built for scanned text documents, not designed pages. It produces ghosting artifacts, misidentifies decorative fonts, and cannot reconstruct multi-column layouts or image-text relationships.
Does Canva flatten PDFs by default?: Canva offers a Flatten PDF checkbox during export. When enabled, all layers merge into raster images. Even without flattening, Canva's PDF structure can be complex enough that standard converters struggle.

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