Load a song or recording, drag the handles on the waveform, add a fade and save the part you want as MP3 or WAV.
To cut an MP3, add the file, set a start and an end on the waveform, and save: the tool keeps only the sound between the two handles and writes it as a new file. The file is decoded once by your browser into raw samples, and the waveform is drawn from them: each column is the loudest sample in its slice of the sound. Dragging a handle, pressing the arrow keys on it, or typing a time such as 1:23.5 all change the same start and end. When you save, the samples between those two times are copied, the optional fades are applied, and the result is written as MP3 or WAV. The original file is never changed. Because the cut works on decoded samples, it can start and end at any thousandth of a second, not only at MP3 frame boundaries.
Times are written minutes:seconds.milliseconds, so 1:23.5 is one minute and 23.5 seconds, 83.5 on its own means 83.5 seconds, and 1:02:03 is one hour, two minutes and three seconds. A start must be before the end by at least 0.05 seconds, and neither can pass the length of the sound. Each handle is a slider you can reach with the Tab key. An arrow key moves it 0.1 seconds, Shift with an arrow moves it 1 second, Page Up and Page Down move it 5 seconds, and Home and End jump to the ends. Play selection plays just the part between the handles, with the same fade lengths as the saved file (fades longer than the cut are shortened in proportion to fit), so you can check an edit before saving. Click the waveform to move the nearer handle to that spot.
A fade in raises the volume from silence to full over the first 1, 2 or 5 seconds of the cut, and a fade out lowers it to silence over the last ones. This avoids a click when the cut starts or ends in the middle of a note. If the two fades together are longer than the cut, both are shortened in proportion. Saving as MP3 re-encodes the sound, so a second round of lossy compression is applied; at 192 kbps or more the extra loss is small for most listening, and WAV avoids it at the cost of size. A 30-second cut at 192 kbps is 30 times 192,000 divided by 8, which is about 720,000 bytes, about 0.7 MB (an estimate of the audio data; the file is slightly larger because of frame headers and padding). The same 30 seconds as stereo 44.1 kHz WAV is 30 times 44,100 times 4 plus 44, or 5,292,044 bytes, about 5 MB.
The whole file is read and decoded in memory, so a file may be up to 100 MB. Cutting also makes a copy of the selection, so the sound must fit a smaller memory budget than a plain conversion: about 7 minutes of 48 kHz stereo on a computer, about 3 on a phone or tablet, and up to 30 minutes of mono at lower rates. Longer sounds are refused with a message. The tool opens the formats your browser can play: MP3, WAV, M4A, AAC and FLAC in current browsers, and OGG in Chrome, Edge and Firefox, but not reliably in Safari. Tags and cover art are not copied into the new file. The audio is processed in this tab and a background worker and is not uploaded. The MP3 encoder, about 0.9 MB (its script and its WebAssembly file), is downloaded only when you first save an MP3. It is LAME, licensed under the LGPL, and the page links to the LAME project.
Add the MP3, drag the two handles on the waveform to the start and end you want, press Play selection to check, then press Cut and save. A 30-second cut at 192 kbps comes out near 0.7 MB. The original file stays as it was.
Cut the part you want, usually 20 to 30 seconds, add a 1 or 2 second fade out so it ends smoothly, and save as MP3. Then copy the file to your phone the way your phone expects; this tool only makes the audio file.
Yes. Use the Start and End boxes and type minutes:seconds.milliseconds, such as 0:45.250, or just seconds such as 45.25. Press Enter or leave the box. A time past the end of the sound, or a start after the end, shows a message and leaves the cut as it was.
A little, if you save as MP3. The cut sound is encoded again, which adds a second round of lossy compression. At 192 kbps or higher the extra loss is small for most listening. Save as WAV if you want no further loss, knowing a 30-second stereo WAV is about 5 MB.
The tool uses your browser's own audio decoder, so it opens what the browser can play. Safari has been less reliable with OGG, for instance. Try Chrome, Edge or Firefox, or convert the file to MP3 or WAV with the audio converter first.
No. The file is decoded and cut in your browser, in this tab and a background worker, so no server receives your audio. The page counts visits with Google Analytics using rough groups such as 1 to 10 MB, never a file name or a sound. Your fade, format and MP3 settings are remembered on this device.