Convert CHM to FB2

Understanding CHM and FB2 file formats

CHM (Microsoft Compiled HTML Help) is a proprietary format developed by Microsoft for online help documentation. It packages HTML pages, images, and navigation tools into a single compressed file, commonly used for software manuals and eBooks on Windows systems.

FB2 (FictionBook 2.0) is an open XML-based eBook format popular in Russia and Eastern Europe. It is designed for fiction books, focusing on structure and metadata rather than appearance, making it ideal for eBook readers and conversion to other formats.

Why convert CHM to FB2?

Converting CHM to FB2 allows you to read help files or eBooks originally in CHM format on a wider range of eBook readers and mobile devices that support FB2. FB2's open structure also makes it easier to edit and manage metadata.

How to convert CHM to FB2

There is no direct, one-step converter from CHM to FB2, but you can achieve this conversion in two main steps:

1. Extract the content from the CHM file using a tool like CHM Decoder or 7-Zip. This will give you the HTML files and images contained in the CHM.
2. Convert the extracted HTML files to FB2 using a program like Calibre. Calibre supports importing HTML files and exporting them as FB2 eBooks.

Recommended software for CHM to FB2 conversion

• CHM Decoder: Extracts HTML content from CHM files.
• 7-Zip: Free tool to open and extract CHM files.
• Calibre: Powerful eBook management tool that can convert HTML to FB2. After extracting HTML files, add them to Calibre and use Convert books → FB2 to create your FB2 file.

Step-by-step conversion process

1. Open your CHM file with CHM Decoder or 7-Zip and extract all contents to a folder.
2. Launch Calibre and add the main HTML file (usually index.html or default.html).
3. Select the book in Calibre, click Convert books, and choose FB2 as the output format.
4. Adjust metadata and structure as needed, then start the conversion.
5. Find your new FB2 file in Calibre's library folder.

Tips for successful conversion

• Check the extracted HTML files for completeness before converting.
• Review the FB2 output in an eBook reader to ensure formatting and chapters are correct.
• Edit metadata in Calibre for better organization and searchability.