About this tool
Audio trimming retains the segment between selected start and end times, removing leading silence, extracting a sentence, or creating a short sample. The range is set in seconds and output is commonly re-encoded, so cut precision and waveform boundaries depend on decoding and format.
A hard cut at nonzero amplitude can click, while speech and music need natural breath or decay. Simple trimming suits rough segments; millisecond precision, fades, and lossless frame cuts call for a professional editor.
How to use it
Listen and locate the range
Note the desired start and end while leaving a small natural boundary.
Enter valid times
Ensure start is before end and neither exceeds the total duration.
Export and inspect cuts
Listen for clipped words, clicks, or excessive remaining silence at both ends.
Supported range and limits
- How you select
- By start and end time, at second / millisecond precision
- Output
- MP3. The result is re-encoded, so one lossy generation is added
- Boundary alignment
- MP3 works in frames, so the real cut can land a few tens of milliseconds from the time you typed
- What is kept
- Only audio inside the range; everything outside it is not written to the output
- vs Remove Silence
- This cuts at times you specify; Remove Silence detects blank passages automatically
- Where it runs
- FFmpeg compiled to WebAssembly in your browser; the file is never uploaded
When you would use it
Cleaning recording ends
Remove preparation at the beginning and unrelated silence after the content.
Extracting an audio excerpt
Keep a quotation, example, or alert from a longer recording.
Pulling the useful part out of a recording
Take the two minutes you need to quote from an hour-long meeting rather than sharing the whole thing.
What to know before you start
- The trimmed output is a new file, so retain the original for later range changes.
- Cuts inside a strong waveform can click; moving near natural silence often helps.
- A re-encoded lossy output is not byte-identical to the corresponding source segment.
Related concepts
- time range
- The retained interval defined by start and end time.
- zero crossing
- A point where waveform amplitude crosses zero, often a cleaner place to cut.