You've downloaded an MP3 file from the web, or recorded a track onto your PC. Or maybe you've extracted the audio from a YouTube video. You have the MP3 file, but there's some stuff at the start or the end, or both, that you want to remove.
Do you need to download and install an audio file editor, just to trim the ends of an MP3 track? Thankfully, no. You can do it all online, for free.
Fire up a web browser and head to http://cut-mp3.com (note there's no www, or it seems you end up at a different site altogether). Upload your mp3 file, drag the sliders to isolate the parts that you want to remove, then press the Cut button. Once your edited track sounds OK, you can download a revised MP3 file.
It's as simple as that, and it works very well. I used it the other day to isolate a small section of audio to use as a ringtone on my phone, and the results were great.