Convert ebook files online

(AZW, CBZ, CHM, DJVU, DOCX, EPUB, FB2, HTML, MOBI, PDF, SNB or TXT etc.)
Conversion Results:
# Output File Source File Action

Steps:

1. Click "Choose Files" button to select multiple files on your computer. You can also click the dropdown button to choose online file from URL, Google Drive or Dropbox.

2. Choose a target ebook format. The target ebook format can be AZW3, EPUB, DOCX, FB2, HTML, OEB, LIT, LRF, MOBI, PDF, RTF, SNB, TCR or TXT etc.

3. Click "Convert Now!" button to start conversion. The output files will be listed in the "Conversion Results" section. Click icon to show file QR code or save file to online storage services such as Google Drive or Dropbox.

Compare CHM with EPUB:
Name CHM EPUB
Full name Microsoft Compiled HTML Help Electronic Publication
File extension .chm .epub
MIME application/vnd.ms-htmlhelp application/epub+zip
Developed by Microsoft International Digital Publishing Forum
Type of format Document file format Ebook file format
Introduction Microsoft Compiled HTML Help is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM, for Compiled HTML. The format is often used for software documentation. EPUB is an e-book file format with the extension .epub that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers. It is a free and open standard published by the International Digital Publishing Forum (IDPF). The term is short for electronic publication and is sometimes styled ePub.
Technical details Help is delivered as a binary file with the .chm extension. It contains a set of HTML files, a hyperlinked table of contents, and an index file. The file format has been reverse-engineered and documentation of it is freely available. CHM files support the following features: data compression, built-in search engine, ability to merge multiple .chm help files, extended character support. EPUB is the most widely supported vendor-independent XML-based (as opposed to PDF) e-book format. An EPUB file is a ZIP archive that contains, in effect, a website-including HTML files, images, CSS style sheets, and other assets. It also contains metadata. EPUB 3 is the latest version. By using HTML5, publications can contain video, audio, and interactivity, just like websites in web browsers.
Associated programs Sumatra PDF, HTML Help Workshop Adobe InDesign, calibre, LaTeX, Genebook, epubcheck.
Sample file sample.chm sample.epub
Wiki CHM on Wikipedia EPUB on Wikipedia