Readers
| Format | Current engine |
|---|---|
| PDF.js with HTTP Range and internal page rendering | |
| EPUB | archive/parser pipeline rendered by the Web client |
| MOBI | parser pipeline with format limitations |
| CBZ | indexed ZIP images |
| CBR | indexed RAR images |
All engines share navigation, progress, cleanup, memory-budget, responsive layout, and reader telemetry contracts. Large files should be streamed or fetched in ranges rather than loaded entirely. See formats and performance/progress.