How to Trim, Fade and Convert Audio Files in Your Browser
Money, health & time · October 19, 2026 · 2 min read
Long audio files are awkward. A voice note has a minute of silence at the start, a song has the one part you want as a ringtone, or a recording needs a gentle fade so it doesn't end with a bump. A trimmer solves all of these, and it can run entirely in the browser.
Trim a file
- Open the Audio Trimmer and choose a file. It is decoded on your device.
- Drag the Start and End sliders. The picture of the sound wave shows the part you keep in blue. You can also type times like 1:23.4.
- Press Listen to the result to check it.
- Press Save as WAV.
Fades
A fade in lifts the sound up from silence over the number of seconds you pick, and a fade out brings it down. Half a second to two seconds is usually enough. They hide the click you sometimes hear when a cut lands in the middle of a sound.
Volume, mono and sample rate
- Make it as loud as possible raises the volume until the loudest moment is just under the limit. It never distorts, and it leaves silence alone.
- Mono combines the left and right sides into one. It halves the file size and suits speech.
- Sample rate sets how finely the sound is measured. 44100 Hz is the standard for music. 16000 Hz is fine for speech and makes files much smaller.
About WAV files
WAV holds the sound without squeezing it, so files are large, about 10 MB for each minute of stereo music. That makes them a good starting point for editing, and almost every app can open one. If you need a small file for sharing, run it through a compressor afterwards.
If a file won't open
Browsers can read MP3, WAV, M4A, OGG and FLAC in most cases, but a few formats aren't supported everywhere. If you see an error, try another browser, or convert the file to MP3 or WAV first. Files up to 200 MB are accepted.