As a matter of fact, lossless compression is not very difficult for image files. With proper algorithms, you can compress the file size of an image while preserving as much detail as possible. On the contrary, it is very difficult to enlarge images without quality loss. As everyone knows, image is made up of pixels, and it becomes blurry and distorted when you zoom in on it. If we want to realize the lossless magnification of an image, we need to make up for the missing details after the image enlargement, which has a very high requirement on the calculation and analysis capabilities of program.

Acoustica is a very excellent multi-track audio editing tool for Windows and Mac platforms, developed by Acon Digital from Norway. It features dynamic sound processing, real-time noise reduction, format conversion, time scale adjustment, audio equalizer, chorus effects, reverberation effects, etc. To some extent, it can be regarded as a lite edition of Cool Edit Pro.

Because the supporting degree for audio/video formats varies from media device to media device, it is not possible for the same video to be played properly on every device. And with the advent of more and more video formats, it's harder to get a piece of hardware that's compatible with all media file types on the market. Even on a computer, it is impossible to install decoders for all media formats. In this case, multimedia format conversion tools come in handy.

Switch (full name: Switch Audio File Converter, formerly called Switch Sound File Converter) is a very stable, user-friendly, comprehensive and professional audio format universal converter/compressor/extractor for Windows and Mac platforms, developed by NCH Software from Australia. It helps user convert and encode sound files quickly and easily.

Any Video Downloader Pro (formerly called HD Video Downloader Pro) is a fairly good online video universal downloading, converting and searching tool for Windows, developed by Any Video Software (formerly known as Vimato). It claims to be able to download online videos from YouTube, Facebook, Dailymotion, as well as thousands of other video sharing websites around the world, and to accelerate the video download speed by up to 5 times.