How to trim audio online
Use this tool to select and export part of an audio file in your browser. Drop a file or click browse files, set the start and end points, check the selection, then download the result. The page processes the file locally; it is not uploaded.
- Drop your audio file onto the drop zone, or click browse files.
- Drag the two handles on the waveform to set your start and end points.
- Click Preview selection to listen to just the part you've selected.
- Wait for the trim to process automatically, then preview the result.
- Click Download trimmed audio.
Select and check the trim range
Set the range with the separate start and end handles. The interface shows Original length, Start, End, and Trimmed length as you adjust them. Click the waveform to seek the audio preview, or use Preview selection to play the selected range once; it stops when the range ends.
- Use the Left Arrow and Right Arrow keys to adjust the focused handle.
- Use Home or End to move the focused handle toward the start or end of the file. The other handle and the minimum gap can prevent it from reaching the absolute boundary.
Choose Fast (recommended) or Precise
Fast (recommended) is selected by default. It attempts an FFmpeg stream-copy trim without audio re-encoding, but the cut may not land exactly on the selected time for every file. If the fast operation fails, the tool automatically falls back to re-encoding.
Choose Precise when the cut must land on the selected timing. This mode re-encodes. Recognized extensions use defined encoder settings; unknown extensions use a default high-quality setting, so do not assume that the original bitrate or encoding settings will be preserved. Fast mode also uses the applicable re-encoding settings when its automatic fallback is needed.
What to know before trimming
- The browser loads an audio engine of about 30 MB when processing begins. Loading can take time.
- Some formats may not show a waveform. The interface reports that trimming can still work in this case.
- No hard maximum file size is defined in the page code. The file is read and decoded in memory, so large files may fail or use more memory than your device has available.
- The page lists MP3, WAV, FLAC, AAC, OGG, and more, but it does not provide a complete guaranteed format list or browser compatibility matrix.
Frequently asked questions
Can I trim an MP3 with this tool?
MP3 is listed in the interface alongside WAV, FLAC, AAC, OGG, and more. These examples are not a complete guaranteed format list. The download keeps the original file extension, but the processing mode determines whether the audio is stream-copied or re-encoded.
Is there a file size limit?
No hard maximum is defined in the page code. Because the file is read and decoded in memory, a large file may fail or exhaust available memory.
Is my audio uploaded anywhere?
No. The entire trim happens in your browser using a local audio engine. Your file never leaves your device.
Why does it download something on first use?
The local audio engine that powers the trim is about 30 MB. The browser downloads it when processing begins, and loading can take time.
Does this change my file's bitrate or compress it?
It depends on the mode. Fast mode attempts to avoid re-encoding, but it can fall back to re-encoding if stream copy fails. Precise mode always re-encodes; recognized extensions use defined encoder settings, while unknown extensions use a default high-quality setting. Either may change bitrate or other encoding details. Use the Audio Compressor when you want deliberate file-size reduction.