Load an audio file and the waveform and range handles appear here.
Fades
Even at 0 both ends get a 3 ms taper, which is what stops a cut from clicking. Fades are applied inside the exported range.
Export
WAV is 24-bit and uncompressed, so nothing is lost. Output is two channels; a mono source is written as two identical channels. For a mono 16-bit source those two together make the file about three times larger.
Drag the handles on the waveform, or type start and end times, to keep just the part you need. Several files can be joined end to end instead. Add fades and export as WAV or MP3.
Formats
MP3 / WAV / FLAC and more
Questions
Which formats can it read?
Anything the browser can play, which in practice means MP3, WAV, M4A (AAC), OGG and often FLAC. If a file cannot be read, the page says so. To take the audio out of a video first, run it through the file converter (/file/convert) and load the result here.
How long a file can it handle?
Up to 20 minutes and 100MB per file. Decoded audio sits in memory uncompressed — about 23MB per minute in 48000 Hz stereo — so the size of the file tells you very little about what it will cost to open. A 9MB podcast MP3 is routinely 45 minutes. Anything over the limit is reported rather than loaded.
Can it also fix the level or the sound?
No. This tool only cuts and joins; it leaves level and tone exactly as they were, apart from the fades at the ends. For loudness and polish there is the mastering tool (/audio/master), for separating vocals and instruments the stem separator (/audio/separate), for key and tempo the key & tempo changer (/audio/pitch-tempo), and for changing file format the file converter (/file/convert).
Is the audio stored anywhere?
No. Everything happens in the browser and nothing is sent to a server. Closing or reloading the page discards both the audio and the range you had set.
Does it work on a phone?
Yes. The handles are wide enough for a finger, and the range can also be typed into the number fields. Memory use scales with length, though, so start with a few minutes rather than a long recording — long exports are steadier on a computer.