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.

CHM was introduced as the successor to Microsoft WinHelp with the release of Windows 98 and is still supported in Windows 7. Although the format was designed by Microsoft, it has been successfully reverse-engineered and is now supported in many document viewer applications.

You can convert PDF to CHM by PDFConvert desktop software or command line program.

The PDF to CHM converter online program is not available yet. Please check back later.

After installing PDFConvert software, click Start - Programs - PDFConvert - PDFConvert to run.

Click the "Convert PDF" Toolbar, click the "PDF to CHM" button, then click the "Add Files" to add local PDF files. You can also directly drag PDF files from file explorer and drop to list.

When selecting a PDF file, PDFConvert will check the PDF file's security information. PDFConvert will automatically remove owner password and restrictions if the PDF file is secured by owner password. PDFConvert will prompt to enter user password if the PDF file is secured by user password which is unable to crack.

Click the "Convert PDF" button to convert PDF files you selected to CHM files. The default output directory is "PDFConvert" directory in "My Document". PDFConvert will try to create this directory if it doesn't exist and open it when conversion is completed.

Download pdfconvert.exe, and run pdfconvert.exe command line program to convert PDF to CHM on background without windows showed.

/?

Shows all command line parameters of pdfconvert.exe.

/i

input files

For example: pdfconvert.exe /i "c:\pdf\1.pdf"

/o

output folder

For example: pdfconvert.exe /o "c:\chm"

/cs 13000

convert pdf file to CHM file

For example: This command will convert local PDF file "c:\pdf\1.pdf" to CHM file "c:\chm\1.chm".
pdfconvert.exe /cs 13000 /i "c:\pdf\1.pdf" /o "c:\chm"