CHM File - opening and understanding

Did your computer fail to open a CHM file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CHM files.

What is a CHM file?

Files with the .chm extension are most commonly associated with Microsoft help documentation files. The CHM files are compiled to create the help contents of an associated application. These files are normally saved in compressed HTML format and include the images, text and hyperlinks contained in the help files.

The .chm file extension is also used for Chameleon source font files and Chemdraw chemical structure files.

How to open CHM files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CHM for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different CHM openers which you will find listed below.

Suggest another file format using extension CHM

While we know of one file format using the .CHM file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CHM file.

Various viewers for this file format

These apps are known to open certain types of CHM files. Remember, different programs may use CHM files for different purposes, so you may need to try out a few of them to be able to open your specific file.

BitZipperBitZipperUser submitted
Go PDF ReaderGo PDF ReaderUser submitted
HTML HelpHTML HelpUser submitted
PDFlitePDFliteUser submitted
Microsoft SQL ServerMicrosoft SQL ServerUser submitted
TouchEn webTouchEn webUser submitted
Adobe AcrobatAdobe AcrobatUser submitted
E-book viewerE-book viewerUser submitted
calibre - E-book managementcalibre - E-book managementUser submitted
Launch ManagerLaunch ManagerUser submitted
We have not verified any software that we know for certain will work with CHM-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with CHM-files. If you know one, please use the 'Suggest a program' link below and tell us about it!