How to Trim an Audio File Online — Cut MP3, WAV, and FLAC Files
Audio trimming is the audio equivalent of video cutting — you specify a start and end time, keep that section, and discard everything outside it. Use it to extract a podcast highlight, cut a ringtone from a song, remove silence from the start of a recording, or isolate a specific music sample.
Common Uses for Audio Trimming
Podcast clips: extract a 60-second highlight from a long episode to share on social media or post as a teaser. Ringtones: cut the chorus from a song to create a custom ringtone (30–45 seconds). Sample isolation: pull a drum break, vocal phrase, or instrument loop from a recording for use in music production. Interview extraction: lift a single question and answer from a long recording.
Silence removal: trim dead air from the start or end of a voice memo before uploading to a podcast host or sending to a client — even a few seconds of silence at the start creates a poor first impression.
- Use the Inspect Metadata tool first to find the exact duration and locate the right timestamps
- Trim before converting — a shorter file converts faster and produces a smaller output
- For podcast clips, aim for 45–90 seconds — short enough to share, long enough to convey value
Supported Formats and Output Quality
MediaFormatter's audio trimmer accepts MP3, WAV, FLAC, AAC (M4A), OGG, and OPUS files up to 500 MB. The output format matches the input — trimming an MP3 outputs an MP3, trimming a WAV outputs a WAV. Enter start and end times in MM:SS format (for example, 1:30 for one minute 30 seconds). For files over an hour, use HH:MM:SS.
For lossless formats (WAV, FLAC), trimming is truly lossless — the output contains exactly the audio data in the specified range. For lossy formats (MP3, AAC), the audio is re-encoded at the trim boundaries, but the quality impact is inaudible at high bitrates (192 kbps and above).