A range of small web applications. Each of them performs a complex task for the user in three simple steps. An example of such a problem could be trimming audio files, merging multiple audio files into one file, or converting them to another format – one application per job. PDF.io allows you to do all the necessary things right in your web browser without downloading special software for each task and installing it on your computer. With that service, you can:> trim mp3 file> convert to most popular audio formats, such as mp3, wav, ogg, m4a, m4r, flac,> a few songs (mp3, m4a, wav, etc) in a single composition ,> convert video to MP4, AVI, MPEG, FLV, 3GP, and extract audio from video or change resolution,> crop video online,> record audio from microphone and save to computer,> record video from webcam. is actively developing new programs that appear regularly and the existing new ones are added