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EPUB Optimizer

Repackage and optimize an EPUB while preserving its readable content and structural validity.

How it works

Choose one EPUB file.
Repackage and optimize the EPUB structure.
Validate the result and compare it with the original.

Related tools

Create ZIP

Bundle selected files in a ZIP archive without uploading them.

ZIP contents and safety inspector

List ZIP entries, declared sizes and suspicious paths without extracting files.

File entropy viewer

Measure byte frequencies and Shannon entropy across a file.