The CHM file format and its associated .chm filename extension, is a proprietary file format developed by Microsoft. Its full name is compiled HTML Help. CHM was released to the public in 1997 as a bundle with Microsoft Windows 98 and was primarily designed to facilitate documentation on the Windows platform, particularly help files for software applications that run on the Microsoft Windows platform. Essentially, a CHM file is a collection of HTML files packed as a single compressed file. Though the format is proprietary, it was successfully reverse engineered by the late 90's to early 2000s allowing the development of open source readers that are capable of opening files with the .chm extension. The format was succeeded by the LIT format.
The .rar filename extension is a popular and partially open archive file format associated with the compression and decompression tool WinRAR. The format was developed by Eugene Roshal with its initial release in 1993. It, like many other archive formats, acts as the compressed data container for one or several files. The archive format can maintain the directory structure of the compressed archive even when unpacked to a directory. The RAR file format supports multi volume file compression where an archive is saved as a sequence of several files of a given size.
FreeFileConvert uses tuned encoding for CHM to RAR conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload CHM files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized RAR results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent RAR audio with dependable progress tracking.
The CHM file format is a binary format that uses the LZX algorithm to compress the HTML data found in the file. The format supports full text searching, indexing, and table of contents, among other useful features.
The RAR archive format supports compression, file spanning, and error recovery. Compression is carried out using a prediction by partial matching algorithm and the lossless compression algorithm LZSS. The RAR file format has a range in file size from as low as 20 bytes to 8 exbibytes less 1. It also supports AES encryption at 256bits as well as the CRC32 checksum and BLAKE2 file hash algortihms.
Upload your document file in the CHM format from your device, Dropbox, or Google Drive.
Select RAR as the output format and click Convert. Adjust optional settings if needed.
Download the converted archive file. Each file stays available for up to 5 downloads.