Online Audio Trimmer with Waveform

Trim with 0.01-second precision using a visual waveform interface. Drag the region to select what to keep, preview before rendering, and export 192kbps MP3.

Trim Audio with Waveform
Drag the cyan selection region on the waveform to choose your clip.

About this online audio trimmer

Want to build a 20-second ringtone from a favorite song? Extract just the standout chorus from a 4-minute track? OneAudio Trimmer uses a WaveSurfer.js waveform interface — a visual representation of amplitude over time. Drag the cyan selection region on the waveform, preview with the Play button, and export MP3 with 0.01-second precision.

The backend uses FFmpeg's setStartTime + setDuration filters — without re-encoding the retained portion, keeping source audio quality at maximum. Supports both audio (MP3, WAV, FLAC, M4A, AAC, OGG) and video files (MP4, MKV) — for videos, only the trimmed audio is returned.

  • WaveSurfer.js waveform UI — zoom, pan, real-time preview
  • 0.01-second precision via exact setStartTime + setDuration
  • In-browser preview before rendering — saves time
  • Audio and video input, always MP3 output
  • Up to 200MB — enough for long albums or 3-hour podcasts
  • Audio quality preserved — no re-encode of unchanged segments

Trim audio online using a waveform

  1. 1

    Upload an audio or video file

    Drag and drop or click. OneAudio renders the waveform as soon as the file loads.

  2. 2

    Drag the cyan selection on the waveform

    Pick the start and end of the clip you want. Click Play to preview. Default selection is the first 30 seconds.

  3. 3

    Click Start Trimming and download the MP3

    Server cuts exactly on the selection in 5-15 seconds. Download the resulting MP3 to your device.

Real uses of audio trimming

Create 15-30 second ringtones
Trim the standout chorus or verse from a song to turn it into a phone ringtone.
Strip silence at the start/end
A recording has 10s of silence at the front and 20s at the back — trim for a tighter file.
Cut music samples for remixing
A producer needs a 2-4 second sample from another track — millisecond precision is exactly what's needed.
Pull shareable clips from podcasts
Carve out a great 1-minute clip from a 60-minute episode to share on social media.

Frequently asked questions about audio trimming

Does trimming degrade quality?
Slightly — OneAudio re-encodes to 192kbps MP3, a small loss vs. the source. For 100% preservation, use a lossless trimmer like mp3DirectCut.
Can I make multiple cuts at once?
Not yet. The current version trims one segment per upload. To keep three clips, upload three times (or use Audacity).
Waveform doesn't render after upload?
File might be too large or in an unusual format. Try a standard format (MP3 or WAV) under 100MB. Reload if the issue persists.
Preview sounds stuttery — will the file stutter?
No — preview uses the Web Audio API and can lag on slower machines, but the rendered file is smooth.
Can I trim shorter than 1 second?
Yes — down to 0.01 second (10 ms). Perfect for micro-samples.
For video files, will the output have video too?
No. The Trimmer only exports the audio track as MP3. For video trimming, use CapCut or another video editor.