Audio

Audio compressor

Reduce audio file size with a quality slider. Shows before and after file size.

Drop your audio file here, or

MP3 · WAV · OGG · AAC · FLAC · M4A · Max 100 MB

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100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use Audio compressor

  1. 01 Drag and drop your audio file onto the upload area, or click to browse
  2. 02 Choose your settings (format, quality, timestamps, etc.)
  3. 03 Click the action button — the engine loads on first use, then processes your file
  4. 04 Click Download to save the result to your device

Frequently asked questions

Common questions about Audio compressor.

Is Audio compressor free to use?
Yes, Audio compressor is completely free. No account, subscription, or payment is ever required — just open the page and start using it.
Does Audio compressor upload my data to a server?
No. Audio compressor runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.
Can I use Audio compressor on my phone or tablet?
Yes. Audio compressor is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.
Are my audio files kept private?
Yes. Audio compressor processes all audio entirely in your browser using ffmpeg.wasm (a WebAssembly build of FFmpeg) or the Web Audio API. Your files are never uploaded to any server.
Why does it take a moment to start the first time?
The audio engine uses ffmpeg.wasm, a ~30MB WebAssembly library that loads on demand — only when you click the action button. Once loaded, subsequent operations are instant. It is not loaded on page arrival to protect page speed.

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Audio merger
Combine two audio files sequentially or with a crossfade transition. Browser-based, no upload.
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About Audio compressor

Audio compression reduces file size by re-encoding audio at a lower bitrate or quality level. The Audio Compressor lets you choose a compression level from minimal (near-original quality, small reduction) to maximum (smallest file, lower quality), with a live preview of the estimated output size before you process. For most voices and podcasts, a 128kbps MP3 is indistinguishable from the original for listeners. For music, 192–256kbps preserves detail. All processing uses ffmpeg.wasm in your browser — no uploads.

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