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How to trim an MP3 or audio file in your browser

You need ten seconds of a forty-minute recording: a quote from an interview, a ringtone, a clip for a video, or a voice memo without the silence at the start. This guide covers how to cut out just that part, without installing an editor or uploading the file.

The fastest way

  1. Open your file in the Audio Trimmer. MP3, WAV, M4A, OGG and FLAC all work.
  2. The waveform appears, so you can see where the sound and the silences are.
  3. Drag the Start and End sliders over the part you want to keep. The shaded region and timestamps update as you move them.
  4. Press Preview selection to hear only that part, and adjust until it's right.
  5. Press Trim & download to save the clip.

Tips for a clean cut

Why the download is a WAV

Browsers can encode uncompressed WAV reliably, but they don't include an MP3 encoder. So the trimmed clip is saved as WAV, which is lossless and plays everywhere. The trim itself costs no quality: the selected audio is copied out unchanged.

Need a smaller file?

WAV files are large. To share the clip or post it online, run it through the Audio Converter and export it as compressed WebM/Opus where your browser supports it. Trimming first keeps that file as small as possible.

A note on privacy

The Audio Trimmer decodes and cuts your file entirely in your browser. Nothing is uploaded, and it keeps working offline once the page has loaded.

Open the Audio Trimmer →

Common questions

How do I trim an MP3 online?

Open the MP3 in the Audio Trimmer, drag the Start and End sliders over the waveform to select the part you want, press Preview to check it, then Trim & download. The clip is cut in your browser and saved to your device.

Why does the trimmed file download as WAV?

Browsers can reliably encode uncompressed WAV but don't provide an MP3 encoder, so the clip is exported as WAV. It's lossless and plays everywhere. If you need a smaller file, run it through the Audio Converter afterwards.

Does trimming reduce the audio quality?

No. The selected section is copied out as-is into a lossless WAV, so nothing extra is lost. Converting it back to a compressed format later is what costs quality, and only if you compress it again.

Can I trim long recordings?

Yes, but the whole file is decoded into memory to show the waveform and cut it. Very long recordings use more RAM and can be slow on phones or older computers.

Is my audio uploaded?

No. The file is decoded and cut locally with the Web Audio API. Nothing is sent to a server, so voice memos and private recordings stay on your device.