FREE TOOLS

EPUB Inspector

Inspect EPUB metadata, resources, encryption declarations and chapter order.

EPUB

JSON

Browser only

Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.

This tool needs JavaScript. If it does not load, refresh the page and try again.

How to use this tool

Choose an EPUB file within the displayed limits. Supply settings when shown.
Choose Process ebook. Cancel stops the worker.
Download and inspect the result before replacing your original. Reset clears inputs and results.

Choose a local EPUB to process without uploading its contents.

20 MiB compressed input; 64 MiB expanded/output; 1,000 ZIP entries, 8 MiB per entry, 60-second cancellable worker. Reading-order XML is limited to 16 MiB including repeated chapters.
EPUB 2 and EPUB 3 only. UTF-8 or BOM-marked UTF-16 XML. ZIP64, unsafe paths, internal DTDs and custom entities are rejected.
No DRM removal. Remote resources and scripts are never loaded. Extraction uses the first rendition; metadata editing requires one unsigned rendition.
Text/HTML reading copies omit layout, styling, images, links, scripts and media. Complex math and interactive content may not retain meaning.
Images: original PNG, JPEG, GIF or WebP only; SVG, encrypted and remote images are excluded. Image metadata is preserved.
Creation: plain text or Markdown up to 2 MiB, at most 500 chapters, optional PNG/JPEG cover. Markdown links, external media and HTML attributes are omitted.
Inspector reports package structure, not complete EPUB conformance or accessibility. Metadata editing preserves content and its existing active resources.

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