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Real-world conversion quality — verified
We ran Attention Is All You Need by Vaswani et al. through our converter and measured the result page by page. Here's what the numbers look like.
Source: Attention Is All You Need, Vaswani et al. (2017) — arXiv:1706.03762, CC BY 4.0 — 15-page research paper with model architecture and performance tables
Quality metrics — every page measured
99.9%
Text fidelity (avg similarity)
EPUB3
Semantic
Accessibility structure
PDF vs EPUB3 — what changes
Original PDF
- Fixed page size — no reflow
- Small text on phone screens
- Tables as images or broken layout
- No semantic heading structure
- Fails WCAG reflow requirement
- Not readable on Kindle / Kobo
After conversion — EPUB3
- Reflowable text — adapts to any screen
- Readable at any font size
- Performance tables as real HTML
<table>
- Heading hierarchy preserved (H1–H3)
- EPUB Accessibility 1.1
- Works on Kindle, Kobo, Apple Books
The hard part: model performance tables
Many converters turn complex tables into PNG images — readable only at original size, not selectable, not screen-reader accessible. Our converter detected the performance comparison tables in Attention Is All You Need and rendered them as proper HTML <table> elements.
That means: the data is selectable, searchable, screen-reader navigable, and scales correctly at any font size. No image fallback.
How we verify quality
Every conversion runs through our built-in QC pipeline:
- ✓ Page-by-page text extraction and similarity comparison
- ✓ Positioned text presence check (no silent empty pages)
- ✓ Page size fidelity check (PDF dimensions preserved)
- ✓ Structure detection: headings, tables, lists
- ✓ Round-trip validation: EPUB rendered back to PDF, re-compared
The Attention Is All You Need conversion scored 0.9991 average text similarity across all 15 pages, with native PDF text extraction (zero OCR fallbacks).