Turn an EPUB Into Editable Notes Without Losing Track of Illustrations

An ebook can be a good research source, but a reading app isn’t always a convenient place to reorganize quotations, add questions, or collect notes for a project. Markdown gives you a plain-text document you can edit in many writing apps. The main decision is whether you also need the illustrations your notes refer to.

Start with an EPUB you have permission to convert, such as a book released under a license that covers your intended use. Check the license or other permission yourself. Do not bypass DRM: password-protected, DRM-protected, or damaged books are not supported by this tool.

Choose an export that matches your notes

The LensUp workspace accepts one EPUB 2 or EPUB 3 file at a time. When you select a book, it converts automatically and opens the result in a Markdown editor with a Preview. If your goal is to convert an EPUB into Markdown notes, review the result before you treat it as a finished working document.

Use Copy or Download .md when you need the text alone. A Markdown file can reference an image, but the reference alone doesn’t put the image bytes in the file. If you want supported illustrations alongside your notes, choose Download with images (.zip). The ZIP normally contains book.md and an assets folder with supported raster images, including PNG, JPEG, GIF, and WebP files.

Unzip the package and keep the Markdown file and its assets in the same relative arrangement. Moving only book.md into another folder can leave its image references pointing to files that are no longer there. If you move or rename the asset folder, update the references in the Markdown and open the moved document to check them.

The ZIP doesn’t promise that every visual element survived conversion. Repeated image-only ornaments may be removed, and if you see warnings about unsupported or skipped image assets, compare that part with the source. An export with no images doesn’t prove that the original had no illustrations.

Review before you reorganize

Start by checking a few passages against the permitted source. Look at a section with an illustration, one with a footnote or publisher note, and one with a table if the book has one. Unusual CSS, merged table cells, and publisher notes can need manual attention. Keep your source citation with the notes so a later reader can identify the book and locate the relevant passage.

A hypothetical example: a note about a botanical diagram refers to “Figure 3.” Before shortening the surrounding text, check that the exported image is actually Figure 3 and record its caption or other identifying detail. An image that happens to sit nearby isn’t proof that it’s the right one.

You can then edit the Markdown to add your own headings, questions, or summaries. The optional Add book details at the top (YAML front matter) setting adds book details to Copy, Markdown, and ZIP output; it is off by default. You don’t need it just to make notes.

Preview is limited to 100,000 characters, so where it stops tells you nothing about whether a longer download is complete. Beyond 500,000 characters, the editor shows a read-only excerpt and Copy is disabled; the full text remains available for download. With a long book, check the downloaded file itself.

A quick check after moving the files

Possible problem Practical check
An illustration no longer appears Open the moved Markdown and confirm that the asset folder and relative reference still match.
A note points to another chapter Follow the reference and compare its destination with the source; repair it if needed.
A passage or table looks odd Compare that passage with the source before using it in your notes.
Preview ends early Check the downloaded output instead of assuming the book ends there.

This article was substantially drafted by GPT-6.1 Terra for Yan Wang / LensUp. A Codex agent inspected the formal source and live page text on 2026-10-29. No new EPUB conversion, browser or reader rendering, device test, or human-owner test was performed.

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