Decode a video's audio locally and export it as lossless WAV or compact WebM/Opus.
MP4 · WebM · MOV (browser-dependent) +→ WAVModerate on device
Trim Audio
Cut a recording to the exact seconds you want, with a waveform to guide you.
Processed locallyIn: MP3, WAV, OGG, M4A (browser-dependent), WebMOut: WAV, WebM (Opus)
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How to use trim audio
Select an audio file; a waveform renders locally.
Set start and end points on the waveform or with time fields.
The selection is cut sample-accurately from the decoded audio.
Export WAV or WebM/Opus; duration is verified before download.
What this tool does
- Local waveform rendering
- Sample-accurate cutting (no re-encode needed for WAV output)
- Preview the selection before exporting
- WAV and WebM/Opus output
How the result is verified
The exported audio is re-decoded and its duration compared with your selected range within a few milliseconds.
Frequently asked questions
Will trimming reduce my audio quality?
WAV export is lossless — the selected samples are written exactly as decoded. Opus export re-encodes at a quality suitable for voice and general listening.
Is my file uploaded to a server?
No. The file is opened with your browser's File API and processed by code running in your tab. You can confirm this yourself: open your browser's developer tools, watch the Network panel, and process a file — no request carries your file's bytes. See our How it works page for a step-by-step verification guide.
Related tools
Set in/out points on a preview player and export the range as a locally re-encoded WebM clip.
MP4 · WebM · MOV (browser-dependent)→ WebMHeavy on device
Resolution and bitrate presets re-encoded locally in real time, with before/after size reporting.
MP4 · WebM · MOV (browser-dependent)→ WebMHeavy on device