Audio Trimmer
Cut part of an MP3, WAV, M4A, OGG or FLAC file on its waveform, with fades, mono and normalise, and save it as WAV. The file never leaves your device.
Drag a file here, paste it, or choose one. Up to 300 MB. It stays on your device.
The file is opened in this tab and never uploaded. The trimmed part is saved as a WAV file.
How is this calculated?
The selection is the samples from start × rate to end × rate. Fades multiply the samples by a straight line from 0 to 1 (or 1 to 0). Normalising multiplies every sample by 10^(−1/20) ÷ the loudest sample.Runs in your browser — nothing you enter leaves this device.
About this tool
What it does
Audio Trimmer cuts the part of an audio file you want and saves it as a new file — a ringtone from a song, the useful minute of a long voice note, an intro without the silence before it. Open an MP3, WAV, M4A, AAC, OGG, Opus or FLAC file (which formats open depends on your browser), and its waveform appears, the outline of the sound over time. Set the start and end by typing times, by moving the two sliders, or by clicking the waveform, which moves the nearer edge of the selection. Play the selection to hear exactly what will be saved. You can add a fade in and a fade out of up to ten seconds each, mix stereo down to mono, and normalise, which raises (or lowers) the volume so the loudest moment reaches −1 dBFS, just under the maximum. The result is saved as a WAV file, uncompressed 16-bit audio at 44.1 or 48 kHz, which every phone, player and editor opens. The file is opened and cut in your browser and never uploaded.
How to use it
- Choose or drop an audio file.
- Set the start and end: type them, move the sliders, or click the waveform.
- Add fades, mono or normalise if you want them.
- Press Play selection to check it, then Save as WAV.
Limits and your data
- The trimmed audio is saved as WAV only: browsers cannot write MP3 or AAC without an extra encoder. WAV files are larger — about 10 MB a minute in stereo.
- The audio is decoded at the sample rate you choose (44.1 or 48 kHz); a file at another rate is converted to it.
- Very long files use a lot of memory: about 45 minutes of stereo is the most this page will open.
- Which formats open depends on the browser; if one does not, try another browser or convert it to WAV or MP3 first.
- The file is read and cut in this browser tab. Nothing is uploaded, and nothing is kept after you leave the page.
Questions
How do I make a ringtone?
Open the song, select 30 seconds or less (an iPhone ringtone can be at most 40), add a short fade out, and save. Android accepts the WAV directly; on an iPhone, convert it to M4R in GarageBand or Finder.
Is the quality reduced?
No more than once. The WAV is uncompressed, so nothing is lost in saving it; a compressed source such as an MP3 keeps the quality it already had.
Can I cut more than one part?
Save one part, then change the start and end and save again. Each save is a separate file.
What does normalise do?
It sets the volume so the loudest moment is just under the maximum, making a quiet recording louder without clipping.