How to use it
- Choose an audio file from your device. Its waveform appears after decoding.
- Drag across the waveform to select the part to keep, or type the start and end in seconds.
- Optionally set fade-in and fade-out lengths, the fade curve and mono mixing.
- Select Play selection to check it, then Download WAV.
How it works
The file is decoded with your browser's built-in audio decoder (Web Audio decodeAudioData), so it accepts what your browser can play: MP3, WAV and AAC/M4A everywhere, OGG Vorbis and Opus in most browsers except older Safari, and FLAC in current browsers. The browser converts the audio to its own sample rate, usually 44,100 or 48,000 Hz, and that rate is used for the exported file.
The selected samples are copied, the fades are applied (linear, or a smooth half-cosine S-curve), and the result is written as 16-bit PCM WAV by a small encoder in this page. If fade in and fade out together are longer than the clip, each is shortened to half of it. Samples beyond full scale are clipped.
WAV is uncompressed: about 10 MB per minute of stereo at 44.1 kHz. MP3 export is not offered. Decoded audio needs a lot of memory, so files are limited to 100 MB and 15 minutes.
Examples
Ringtone from a song
Select 30 seconds of the chorus, add a 1-second fade in and a 2-second fade out, and download the WAV. A 30-second stereo clip at 44.1 kHz is about 5.3 MB.
Podcast intro
Cut the first 12.5 seconds of a voice recording, mix to mono with a smooth 0.5-second fade out, and the WAV is about 1.1 MB at 44.1 kHz.
Frequently asked questions
Is my audio uploaded?
No. The file is decoded and cut in your browser, and the WAV is created on your device. Only your Pro status is checked with the site.
Why can I not save as MP3?
Browsers can play MP3 but do not include an MP3 encoder. The tool saves WAV, which you can convert to MP3 with any audio converter if you need a smaller file.
Why is the WAV file much larger than my MP3?
WAV stores uncompressed samples, roughly ten times the size of a typical MP3. It keeps the full quality of the decoded audio.
Does the sample rate change?
It can. The browser decodes audio at its own output rate, usually 44.1 or 48 kHz, and the WAV is saved at that rate. The rate is shown above the download.
Privacy
The audio file is decoded, played and cut in your browser. It is not uploaded, stored or included in analytics; only an anonymous event that the tool was used is counted. Your plan status is loaded from the site's account service.