Remove Silence From Audio

Dead air makes a recording drag. This tool measures the RMS level of your recording in 20-millisecond windows and finds every stretch below a threshold you choose — leading, trailing, and the pauses in between — then stitches what is left back together. That is deliberately classical signal processing rather than a model: silence is defined by a number, so the result is exact, repeatable, and instant, with no guessing about what a network decided. You see the waveform with the cuts highlighted before you commit, so nothing disappears without you knowing about it. Useful for tightening podcast episodes, lecture recordings, voice memos, and interview tape — and it pairs well with the AI noise removal and AI transcription tools on the same site.

How to Remove Silence From Audio

  1. 1

    Add your file

    Drop an audio file onto the page, or click to browse. WAV, MP3, M4A, OGG and FLAC all work.

  2. 2

    Set the silence threshold

    Anything quieter than the threshold counts as silence. Regions that will be cut turn red on the waveform, so you can dial it in by eye rather than by guesswork.

  3. 3

    Add padding if you need it

    Padding leaves a little silence either side of the audio you keep, so the cuts breathe instead of clipping the start of each word.

  4. 4

    Trim and download

    Press Trim silence, then download the result as a WAV. The original file is untouched.

How it works

Silence detection is digital signal processing, not machine learning. The decoded waveform is scanned in 20-millisecond windows, the RMS level of each window is converted to decibels, and any run of windows below your threshold is marked as silence. Adjacent regions merge, padding is applied, and the surviving audio is concatenated into a new buffer through the Web Audio API. Everything about that is deterministic: the same file and the same threshold always produce the same cuts, and the threshold is a number you control rather than a judgement made inside a model.

Supported formats

WAV, MP3, M4A, AAC, OGG and FLAC. Files are decoded by your browser, so anything it can play will work here. Output is exported as WAV.

Frequently asked questions

Is my audio uploaded anywhere?
No. Everything runs inside your browser using the Web Audio API, so the file never leaves your device. You can prove it: load the page, turn off your Wi-Fi, and the tool still works.
Will it cut the quiet parts of speech?
Only if the threshold is set too high. Start around -40 dB and watch the red regions on the waveform — if they start eating the beginnings of words, lower the threshold or raise the padding.
Can I remove only leading and trailing silence?
Set a high padding value. Inline pauses shorter than the padding stay intact, while the long silence at the head and tail of the file is still removed.
Does this use AI?
Not this tool, by design. Silence trimming is RMS threshold analysis — classical DSP that is exact and gives you a number you can adjust, which beats a model you cannot inspect. Audio Magic does use AI where it genuinely helps: Whisper for transcription and RNNoise or DeepFilterNet3 for background noise removal, both running on your own device.
Do I need an account?
No. The free tools work straight away with no sign-up. Creating a free account raises your daily processing limit from 20 to 60 minutes.
Is it free?
Yes. Every tool on this page is free to use, with a daily limit on total audio processed. There is no watermark and no trial period.

Other free audio tools