CHM to TAR.XZ Converter
Processing entirely on your device — large files may take a moment.
Compiled HTML Help and XZ-compressed Tar exist for different jobs: CHM is Microsoft's compiled help format: HTML topics, images and an index compressed into one legacy-but-everywhere file. Old software manuals, ebooks and documentation still ship as CHM. Produce a TAR.XZ for the smallest possible release artifact, or to match the format a build system expects.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How CHM compares to TAR.XZ
| CHM | TAR.XZ | |
|---|---|---|
| Compression | LZX | LZMA2 |
| Encryption | None | None |
| Bundling | HTML topics + index in one file | tar container, single stream |
| Best for | Legacy software manuals | Smallest release artifacts |
How to convert CHM to TAR.XZ
- 1
Select your files
Drag & drop your CHM files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to TAR.XZ". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted TAR.XZ file individually, or grab everything at once as a ZIP archive.
About the CHM format
CHM (Compiled HTML Help) is Microsoft's format for bundling HTML topics, images and a searchable index into one file. An entire generation of software manuals, programming references and even novels shipped as CHM — and modern Windows no longer renders it comfortably.
Extracting a CHM gives you back the raw HTML topics and images: open them in any browser, convert them onward to PDF or EPUB, or migrate the content into a modern documentation system. The help tree becomes regular files.
+ Strengths
- ✓Unlocks decades of locked-in documentation
- ✓Topics come out as clean, standalone HTML
- ✓No deprecated viewer required
! Limitations
- −Index and search metadata do not convert
- −Topic filenames are often opaque codes
- −Some CHM files use encodings that need care
About the TAR.XZ format
TAR.XZ is the smallest common release artifact on Linux: a tar container squeezed with LZMA2. Source distributions, distro packages and countless GitHub release assets use exactly this combination — maximum compression at an acceptable speed.
Compared to TAR.BZ2 it is both smaller and usually faster; compared to tar.gz it is considerably smaller. When a build system, mirror or repository asks for .tar.xz, producing it byte-exact is what keeps CI pipelines and maintainers happy.
+ Strengths
- ✓Highest-ratio common release format
- ✓The default for source distributions on Linux
- ✓Built-in integrity checks (CRC per block)
! Limitations
- −Decompression is memory-hungrier than gzip
- −No random access to individual files
- −Multi-threaded xz is not always compatible
Why convert CHM to TAR.XZ?
There is a concrete reason this conversion exists: Index and search metadata do not convert TAR.XZ sidesteps that — Highest-ratio common release format If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this CHM to TAR.XZ converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for CHM to TAR.XZ?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Are the files inside my CHM archive modified?
No. Contents are unpacked in memory and repacked into TAR.XZ byte-for-byte — the conversion changes the container, never the files inside it.
Is there a size limit for archive conversion?
There is no upload cap because nothing is uploaded — the practical limit is your device memory. A few hundred megabytes of unpacked content works comfortably on a modern computer.