Cutting and joining
The audio trimmer keeps one section of a file. Drag two handles on the waveform or type start and end times in seconds, and use the ringtone button for a thirty-second clip from the start handle. The audio joiner goes the other way: it combines up to thirty files into one, in an order you set, with either a gap of silence or a crossfade between them.
A common pairing is to trim the good part of several recordings and then join them. Do the trimming first, so the joiner only has to handle the parts you want. Every file you add is converted to match the first one's sample rate and stereo layout.
Converter, WAV to MP3 and MP3 to WAV
All three conversion pages share one engine. The general converter is the open door: it reads nearly any audio your browser can decode and saves MP3 or WAV, with options for sample rate and channels. It does not write OGG, FLAC, M4A or AAC files.
The two pair pages are shortcuts with defaults picked for you. WAV to MP3 starts at 320 kbps and shows the estimated size before you save, which suits making a large recording easier to share. MP3 to WAV starts at 16-bit and offers 24-bit, which suits software that wants uncompressed input. Use the general page when the source is something else, such as FLAC or an M4A voice memo.
Trimmer or recorder
These two overlap only at the end. The voice recorder captures new sound from your microphone, shows time and level while you speak, and then opens the take in a trimmer view so you can cut the fumbles and save. The trimmer on its own starts from a file you already have. If the sound exists, use the trimmer; if it does not yet, record first.
Recordings stay in the tab until you save them, so do not close the page before downloading.
A small edge fade is available on both tools. It lasts ten milliseconds, far too short to hear as a fade, but enough to stop the faint click that appears when a cut lands in the middle of a wave.
Choosing the output
Save MP3 when size matters and WAV when you will keep editing. Because MP3 is re-encoded at every save, a chain of exports slowly loses detail, and converting an MP3 to WAV afterwards cannot bring it back.
Bitrate is the other choice. 128 kbps is fine for speech and quick sharing, while 256 or 320 kbps is the safer pick for music you care about. The size estimate shown before saving lets you compare options without downloading each one.