🎚️ Audio Trimmer & Normalizer
Cut intros and silences from voiceovers and podcasts and match loudness to platform targets — measured with the ITU-R BS.1770 method.
✅ Free · No sign-up
Choose a audio file or drag it here
Processed on your device — nothing is uploaded
Processed on your device — nothing is uploaded
Safety
How to use the Audio Trimmer & Normalizer
- Load an audio file (or a video to use its soundtrack).
- Drag on the waveform to select the part to keep, or type start/end.
- Pick a loudness target, gain and fades. The meter shows input and output loudness and peak.
- Preview, then export WAV, MP3 or M4A.
Why creators use it
- Trim a podcast intro and normalise it to −16 LUFS.
- Make voiceovers consistently loud across videos.
Good to know
- Loudness is measured with the BS.1770-4 integrated method (K-weighting + gating). Peaks are sample peaks, not true peaks; leave headroom (−1 dBFS) for lossy formats.
- “Prevent clipping” reduces the gain if reaching the target would push peaks above −1 dBFS, so the result may be quieter than the target. No compressor or limiter is applied.
- MP3/M4A export uses FFmpeg.wasm; WAV export needs no download.
Frequently asked questions
What loudness should I use?
YouTube and Spotify normalise to about −14 LUFS; Apple Podcasts recommends −16 LUFS. Louder masters are turned down by the platform anyway.
Is this real LUFS?
Yes — integrated loudness per ITU-R BS.1770-4, verified against reference test tones.