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Chaekgalpi Tools › E-books
EPUB Font Unlock
Removes the hard-coded fonts from an EPUB whose typeface will not change on your e-reader, so you can read it in the font you choose.
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Windows program · MIT · v0.1.1 · Updated 2026-10-14
For Windows. The file is unsigned, so if "Windows protected your PC" appears the first time, choose "More info → Run anyway".
Chaekgalpi Tools are made by the person who runs Chaekgalpi Library, a Korean-language web service for keeping a reading log. About Chaekgalpi Library (Korean) →
How to use
- Download epub-font-unlock.exe and run it (no install).
- Drop EPUB files or a folder.
- A new EPUB with the font locks removed (and, if you choose, the embedded font files taken out) is created. The original is untouched.
What it does not do
- It does not change the body text.
- DRM-protected EPUBs are not opened; it reports them and moves on.
- No EPUB2/EPUB3 conversion and no restructuring.
- Cover, table of contents and metadata are left alone.
Since v0.1.2, the program sends only its name and version to the Chaekgalpi server when it starts, to check whether a newer version exists. No file is sent, it asks once a day, and you can turn it off in the settings.
Other tools in this group
- TXT to EPUB — Turns a plain-text file into an EPUB e-book without garbled characters. Chapter headings are detected and a table of contents is built.
- Ebook Cover Maker — Type a title, author and publisher name and get an e-book cover that passes self-publishing platform checks, inserted straight into your EPUB. A compliance tool, not a design tool.
- Upaper EPUB Checker — Checks an EPUB before you submit it to Upaper, a Korean self-publishing platform. Catches rejection causes in advance: cover, copyright page, table of contents, forbidden tags.