Convert ebook files online

Conversion Results:
# Output File Source File Action


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, HTMLZ, OEB, LIT, LRF, MOBI, PDB, PMLZ, RB, PDF, RTF, SNB, TCR, TXT or TXTZ.

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 HTML:
Full name Microsoft Compiled HTML Help Hypertext Markup Language
File extension .chm .html, .htm
MIME application/ text/html
Developed by Microsoft W3C & WHATWG
Type of format Document file format Document 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. HyperText Markup Language, commonly referred to as HTML, is the standard markup language used to create web pages. Along with CSS, and JavaScript, HTML is a cornerstone technology, used by most websites to create visually engaging web pages, user interfaces for web applications, and user interfaces for many mobile applications.
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. HTML elements form the building blocks of all websites. HTML allows images and objects to be embedded and can be used to create interactive forms. It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items.
Associated programs Sumatra PDF, HTML Help Workshop Mozilla Firefox, Opera, Google Chrome, Internet Explorer.
Sample file sample.chm sample.html
Wiki CHM on Wikipedia HTML on Wikipedia