Krunch is a nice little service that provides you with the option to upload and compress files in to three different formats (zip, rar, gzip) online. After the file has been compressed by the service, you can either download the compressed archive to your local system or mail it to other recipients instead either by adding the archive as an attachment to the email or by adding the link to the file instead to it.
The online service can also unpack archived files that you upload to it. The developers state that it supports zip, rar and tar.gz archives, but I had issues getting rar files to work properly. The two other formats worked on the other hand without any issues.
Krunch offers two more options which make the site even more interesting. Unkrunch on web decompresses a compressed file that is already hosted on a webserver on the Internet. You simply enter the url of the file or paste it in the form, and it will be decompressed. Last but not least you have the option to compress files on websites and download them as one big compressed file. Pretty useful if this reduces the size of the file significantly for example.
Update: Krunch is not available anymore, a parked domain full of advertisement is now returned when you visit the original. A Krunch alternative is WobZip which seems to be the better service in many respects. The online service supports all popular compression formats, including 7z, rar, zip, tar, gz and two dozen additional formats. Users can however only use it to extract the contents of a compressed file online, but not to compress files.
To do that you either need to enter or paste in the url of the compressed file that you want to unpack, or browser for a file on your local computer instead. You can also add a password for the archive if that is needed. The maximum file size for both online and local files is 200 Megabytes, which should be enough for most situations.
Update: Use a program like Online Convert to compress files from your local system or files that are already hosted on the web.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.