MP3 Trim is a neat little (free) program for clipping mp3s down to size and length. There’s no installation as it runs straight from the executable, and you can add fade effects to make the trim less harsh. Useful on files that contain unwanted sounds at the beginning or end, MP3Trim works by trimming precisely at MPEG frame increments. It can automatically detect digital silence and recover wasted disk space occupied by silent frames. In addition, it recognizes ID3 tags and cleans up missing or incomplete frames and WAV headers (for WAV-embedded MP3s). It also allows you to increase the sound level of the mp3.