Most converters take one file at a time and decide the quality for you. megamp3converter.net does the opposite: drop in a whole folder of songs, recordings, or video clips, choose the bitrate you want, and get every file back as an MP3 in one download. Audio formats like WAV, M4A, FLAC, WMA, AAC, OGG and OPUS all work, and video files are handled too — the soundtrack is extracted and encoded straight to MP3.
The bitrate menu is the part worth knowing about. 320 kbps is the maximum MP3 quality and the right pick when the source is lossless. 192 kbps is the sweet spot for most music. 96 kbps shrinks spoken-word recordings to a fraction of the size without hurting intelligibility.
Built for whole libraries, not single files
Converting an album, a term's worth of lecture recordings, or a backlog of voice memos one file at a time is a waste of an afternoon. Select them all at once and every file goes through the same encoder with the same settings, so your library stays consistent. When more than one file comes back, they're bundled into a ZIP so a single click gets you everything.
Filenames are preserved — only the extension changes — so an album keeps its track order and your tagging software still recognises everything.
Which bitrate should you actually pick?
Bitrate is how many kilobits of data each second of audio is allowed. More bits means more detail retained and a bigger file. For a rough sense of scale, a four-minute song lands around 9.6 MB at 320 kbps, 5.8 MB at 192 kbps and 2.9 MB at 96 kbps.
Use 320 kbps when converting from a lossless source such as FLAC or WAV and you want the best MP3 possible. Use 192–256 kbps for general music listening; most people cannot pick it out from the original in a blind test. Use 96–128 kbps for podcasts, audiobooks, interviews and lectures, where the content is speech and file size matters more than sparkle.
Video in, audio out
Any video you upload is treated as an audio source: the converter reads its soundtrack and encodes that as MP3, discarding the picture. That covers MP4, MOV, MKV, AVI, WebM, M4V, FLV, WMV and MPEG. It's the quickest way to keep the audio of a recorded talk, a rehearsal video or a screen capture. There's a dedicated video to MP3 tool if that's all you're doing.
Not everything should be an MP3
MP3 is the most compatible audio format in existence, but it's lossy — it throws data away to stay small. If you're archiving or editing, convert to FLAC (lossless and about half the size of WAV) or WAV (uncompressed, what every DAW expects). For Apple devices, M4A sounds a little better than MP3 at the same bitrate. And note that converting a lossy file to a lossless one can't restore what the first encoder discarded — it only stops further loss.