Audio Trimmer
Upload an audio file, set the start and end time, and download your trimmed audio.
All processing happens in your browser — your files are never uploaded.
How to use Audio Trimmer
The Audio Trimmer lets you cut any section from an MP3, WAV, FLAC, OGG or AAC audio file by specifying precise start and end times, then exports the clipped segment — all in the browser with no uploads. Perfect for isolating a song chorus, removing silence from a podcast intro, clipping a sound effect or extracting a quote from a long recording.
- Click "Select Audio" and open your audio file (MP3, WAV, FLAC, OGG or AAC).
- Use the waveform timeline to visually locate the region you want to keep.
- Drag the handles or type timestamps to set the exact start and end of the trim.
- Play back the selected region to confirm it sounds correct.
- Click Trim and download the exported audio clip.
Your data never leaves your device — 100% private processing.
Waveform-based vs timestamp trimming
Waveform-based trimming lets you see the audio visually — peaks represent loud sounds while flat areas indicate silence — making it easy to find the exact position of a beat, word or sound effect without listening to the entire file. Timestamp trimming is faster when you already know the exact time codes from a transcript or video editor. Both methods produce the same output; use whichever is more convenient for your workflow.
Preserving audio quality when trimming
For lossless formats (WAV, FLAC), trimming can be performed as a pure sample cut with no quality loss. For lossy formats (MP3, AAC, OGG), the tool performs a stream-copy trim that avoids re-encoding, preserving the original quality. Frame-accurate trimming of MP3 files requires re-encoding because MP3 uses fixed-length frames of approximately 26 ms each; stream copy is accurate only to the nearest MP3 frame boundary. If exact-to-the-millisecond accuracy is required for a lossy file, choose the re-encode option.
Glossary
- Waveform
- A visual representation of an audio signal that shows amplitude (loudness) over time, used to locate sounds quickly.
- PCM
- Pulse-Code Modulation; the uncompressed digital audio format used in WAV files, where each sample represents an instantaneous audio amplitude.
- MP3 frame
- The smallest independently decodable unit of an MP3 stream, lasting approximately 26 milliseconds and limiting frame-accurate stream-copy cuts.
- Fade in / fade out
- A gradual increase or decrease of audio volume at the beginning or end of a clip, used to avoid abrupt starts and stops.
- Sample
- A single numeric measurement of audio amplitude at one instant in time; audio quality is determined by how many samples exist per second and how many bits each sample uses.
Related reading
Frequently Asked Questions
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Why use Audio Trimmer?
- Powered by FFmpeg running directly in the browser — no upload needed
- Supports all major video and audio formats
- Lossless and lossy options for quality control
- Export results immediately without waiting for cloud processing
Common use cases
- Compress a video before uploading to Google Drive
- Extract audio from a video lecture for easy listening
- Trim a video clip for a social media reel
- Convert MOV files to MP4 for cross-platform compatibility
- Merge two audio tracks for a podcast episode
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