Convert CHM to MOBI — Free Online Converter
Convert Compiled HTML Help (.chm) to Mobipocket eBook (.mobi) online for free. Fast, secure document conversion with no watermarks or registration....
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How to Convert
Upload your .chm file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mobi file when it's ready.
About CHM to MOBI Conversion
CHM to MOBI conversion transforms Microsoft Compiled HTML Help files into Amazon Kindle's ebook format, making technical documentation and reference material readable on Kindle devices and apps. MOBI packages content with Kindle-optimized typography, chapter navigation, and the reflowable text layout that Kindle's e-ink display renders beautifully for long reading sessions.
Our converter extracts the HTML content from the CHM archive, maps the topic hierarchy to MOBI's chapter structure, and generates a properly formatted ebook through Calibre's conversion engine. The result is a fully navigable Kindle book with table of contents, chapter breaks, and Kindle-optimized formatting.
Why Convert CHM to MOBI?
Developers and IT professionals accumulate vast libraries of CHM documentation — programming references, API guides, framework documentation — that are only readable on Windows. Converting to MOBI puts this reference material on Kindle, where the e-ink display is ideal for extended reading sessions and the device's portability makes documentation available anywhere.
Kindle's personal documents feature allows sending MOBI files directly to the device via email. Converting CHM reference material to MOBI creates a portable, battery-efficient reading experience that Windows Help Viewer cannot match for actual studying and learning.
Common Use Cases
- Reading programming API documentation on Kindle during commutes and travel
- Building a Kindle library of software reference material from accumulated CHM help files
- Sending technical documentation to Kindle for distraction-free studying on e-ink displays
- Making legacy software documentation available offline on Kindle devices
- Creating Kindle-readable versions of training materials originally distributed as CHM files
How It Works
MOBI format uses PalmDoc compression (or Kindle Format 8 for newer variants) to package HTML content with metadata, navigation, and image resources. The conversion extracts CHM content, processes it through Calibre's HTML-to-MOBI pipeline, generates NCX (Navigation Control for XML) table of contents from the CHM topic hierarchy, and applies Kindle-specific formatting (indentation, font sizing, page break placement). Images are resized for Kindle's display resolution. The output is compatible with all Kindle devices and Kindle apps on iOS, Android, macOS, and Windows.
Quality & Performance
Text content converts with excellent readability on Kindle. Paragraphs, headings, lists, and basic tables render cleanly. Code examples are preserved in monospace formatting, though complex multi-column code layouts may reflow into single-column format. Images are downscaled for Kindle's display (typically 600x800 for e-ink, higher for Kindle Fire). Mathematical formulas and complex diagrams may lose precision at Kindle resolution.
Device Compatibility
| Device | CHM | MOBI |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Tips for Best Results
- 1Send the MOBI to Kindle via personal documents email for wireless delivery to your device
- 2Use Kindle's X-Ray or search feature to navigate through large converted documentation
- 3For code-heavy CHMs, read the MOBI on Kindle Fire or Kindle app (larger screen) rather than e-ink devices
- 4Add the MOBI to Calibre's library for metadata editing (cover image, author, tags) before sending to Kindle
- 5Convert to EPUB instead of MOBI if using newer Kindle devices that support EPUB natively
CHM to MOBI makes Windows help documentation readable on Kindle, combining the portability and e-ink display quality of Kindle with the structured reference content in CHM files.