✂️ Audio Trim
Cut an audio file to an exact start and end time. Fast copy mode preserves original quality. Files never leave your device.
Drop an audio file here, or click to select
MP3 · AAC · M4A · FLAC · WAV · OGG · Opus · AIFF
Frequently Asked Questions
Is my audio file uploaded?
No. Trimming runs entirely in your browser using FFmpeg WebAssembly. Your file never leaves your device.
What is fast copy mode?
Fast copy mode re-cuts the file without re-encoding, preserving original quality and completing almost instantly. Use this when possible.
When should I not use fast copy mode?
Fast copy mode snaps to the nearest keyframe, so the actual trim point may be a fraction of a second off. For precise trimming, disable fast copy to re-encode.
Which formats can I trim?
MP3, AAC (M4A), OGG, WAV, FLAC, and most other common audio formats.
Can I set millisecond-precision trim points?
Yes. Enter time in HH:MM:SS.mmm format for millisecond precision.
Is there a file size or duration limit?
No server-side limit. Very long audio files may be slower to load the waveform preview.