CHM to EPUB Converter

Convert CHM to EPUB online, for free.



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Default
Optimizes layout and formatting for a specific e-reader. Choose the one that matches your device.
No
Attempts to detect and correct common styling problems in the source file. Experimental, so check the output before relying on it.
Enter margin in cm (0 - 10)
No Change
The base font size is the size of the bulk of the text in your document. Set it and we rescale every font size proportionately, so the most common size becomes your chosen value and headings, captions, and other text scale with it. Select "No Change" to keep the original sizes.
Replaces Unicode characters with their closest ASCII equivalents, for readers that cannot display accented or non-Latin text.
Auto
Helpful for eBooks without an encoding declaration or declare an erroneous one. This option will override existing encoding declarations.
Enter Title, maximum 100 characters
Enter Author Name, maximum 100 characters


How to Convert CHM to EPUB?

  1. Click the “Choose Files” button to select your CHM files.
  2. Click the “Convert to EPUB” button to start the conversion.
  3. When the status change to “Done” click the “Download EPUB” button

Easy to Use

Simply upload your CHM files and click the convert button. You can also batch convert CHM to EPUB format.

Best Quality

We use both open source and custom software to make sure our conversions are of the highest quality. In most cases, you can fine-tune conversion parameters using “Advanced Settings” (optional, look for the icon).

Free & Secure

Our CHM to EPUB Converter is free and works on any web browser. We guarantee file security and privacy. Files are protected with 256-bit SSL encryption and automatically deleted after 8 hours.


Compiled HTML Help (CHM) is Microsoft’s format for software documentation and online help. A CHM packs a set of HTML pages, images, and scripts into one compressed file, along with a table of contents, an index, and a full-text search database. It was the standard help system for Windows applications for many years, and it is still used for reference manuals and technical e-books because everything ships as a single, searchable file.

 

How to open a CHM file?

Windows includes a built-in viewer, so double-clicking a CHM usually opens it straight away. If the pages appear blank, right-click the file, choose Properties, and click Unblock — Windows restricts help files downloaded from the internet.

 

On macOS and Linux, use xCHM or KchmViewer. Calibre also opens CHM files and converts them to EPUB or PDF, which is a good way to read one on a tablet or e-reader.

 

Developed by: Microsoft

Initial Release: 1997


Electronic Publication (EPUB) is the open standard for e-books and the format used by almost every retailer except Amazon. An EPUB is really a ZIP package of HTML, CSS, images, and fonts, which means the text reflows to fit whatever screen it is read on. Readers can change the font, size, and margins freely, and the same file works on phones, tablets, e-readers, and computers.

 

How to open an EPUB file?

On Apple devices, EPUB opens directly in Apple Books. On Windows and Android, Calibre is the standard choice and doubles as a library manager and converter.

 

Other good readers are Adobe Digital Editions, which handles DRM-protected library loans, plus Thorium Reader, Google Play Books, and Kobo. Amazon Kindle devices now accept EPUB through Send to Kindle, but for older Kindles convert the file first with our EPUB to MOBI tool.

 

Developed by: International Digital Publishing Forum / W3C

Initial Release: 2007

FreeConvert.com can convert your CHM files to these other formats:


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