# HTTrack Website Copier - Offline Browser
HTTrack is an easy-to-use website mirror utility. It allows you to download a World Wide website from the Internet to a local directory,building recursively all structures, getting html, images, and other files from the server to your computer. Links are rebuiltrelatively so that you can freely browse to the local site (works with any browser). You can mirror several sites together so that you can jump from one toanother. You can, also, update an existing mirror site, or resume an interrupted download. The robot is fully configurable, with an integrated help
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Open Source offline browser

## HTTrack Programming page

HTTrack can be used as a third-party program in batch files, or as library. Depending on your needs, you may look:

### Programming

- Simple use: scripting examples using the httrack commandline program
You can use tens of options (see `httrack --help`) to control precisely the mirror, and used embedded commands in httrack.
- More complex use: plugging external C functions to the httrack library
For advanced functions, you may have to use external C wrappers ; for example when adding advanced crawl features, such as "tuned" filestructure type
Important note: please read the license information of httrack before developing add-ons
See also the page for versions prior to 3.41
- Advanced use: using the library
The library can be used to write graphical GUIs for httrack, or to run mirrors from a program.
Important note: please read the license information of httrack before developing add-ons

### Technical references

- Cache format
HTTrack stores original HTML data and references to downloaded files in a cache, located in the hts-cache directory. This page describes the HTTrack cache format.