How to remove silence from the start and end of a recording

Most recordings begin with a few seconds of fumbling and end with a pause before someone stops the recorder. Removing that dead air makes a clip feel professional and is the most common reason people use an audio cutter.

Read the waveform

After you open a file in the audio cutter, the waveform shows the level over time. Flat, thin areas are silence or low background noise. Tall shapes are speech or music. The first tall shape is where your audio really starts.

Step by step

1. Open your MP3 or WAV file.
2. Drag the start slider until it sits just before the first tall part of the waveform, then fine-tune the number in seconds.
3. Drag the end slider to just after the last tall part.
4. Preview. If the first word sounds cut off, move the start back by 0.1 to 0.2 seconds and preview again.
5. Add a fade in and fade out of about 0.05 seconds to prevent clicks.
6. Prepare the download.

Leave a little breathing room

Speech often starts with a quiet consonant such as "s", "f" or "h" that looks almost flat on the waveform. Cutting exactly at the first loud peak can clip it. Leaving about 0.1 to 0.3 seconds before the first word and after the last word sounds natural and protects those soft sounds.

Silence in the middle

The audio cutter keeps one continuous section, so it removes silence at the ends. To shorten long pauses in the middle, use the remove silence tool, which finds them automatically. To remove any other section from the middle, such as a cough or a mistake, use cut out sections.

Hiss and background noise

If the "silent" parts contain hiss or hum, trimming removes them at the ends, but the same noise stays under the speech. Removing noise from the whole recording needs a noise reduction tool, which Sound Trimmer does not offer. For future recordings, move the microphone closer to the speaker and away from fans and computers.

Phone voice memos

Many phone recorders save M4A files. The file picker here accepts MP3 and WAV. Some browsers can open other formats when you drag the file onto the editor, but only MP3 and WAV are supported. If your recording is M4A, use your phone's built-in trim feature or export it as MP3 or WAV first. See audio file won't open.

Reviewed October 2026 · How we write our guides · Suggest a correction