Can I compress audio from a video?

Yes. Upload MP4, MOV, or WebM and the audio compressor extracts and compresses the audio track — perfect for shrinking narration from screen recordings or clips pulled from social media.

Which browsers are supported?

Latest Chrome and Edge work best with this audio compressor. Safari support varies by codec; if an output format is unavailable, try MP3 or switch browsers.

Free Audio Compressor · In-browser

Free Audio Compressor

This free audio compressor reduces MP3, AAC, Opus, WAV, and other audio to a smaller file size — entirely in your browser, with no upload and. Pick a quality preset (High, Balanced, or Small) or set an exact megabyte target, preview the waveform, and download a compressed file that never leaves your device. Ideal for email attachments, Discord voice clips, podcast hosting limits, and mobile sharing.

Private & localQuality presetsTarget file sizeWaveform preview

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Drop a file into the audio compressor

Drag and drop or click to choose. This audio compressor processes everything locally — max 500MB.

MP3, WAV, AAC, FLAC, OGG, M4A, Opus, MP4, MOV, WebM

Detecting encoder support…

Need format conversion? Try Audio Converter

No file? Try a sample in another format

Click to load — test the audio compressor on MP3, WAV, FLAC, MP4 and more

Recommended next steps based on what you're working on — pick up where this tool leaves off.

Browse all free tools

How this audio compressor works

Add a file

Upload audio or video (up to 500MB). The audio compressor decodes it locally and shows a waveform preview so you can confirm the right track before compressing.

Choose settings

Select a quality preset or target file size, then pick MP3, AAC, or Opus output. The audio compressor adjusts bitrate to match your chosen mode.

Compress & download

Click Compress and download your smaller file when processing finishes. Run the audio compressor again on another track anytime required.

Why use this free audio compressor?

Nothing leaves your browser

This audio compressor encodes locally with WebCodecs. Your recordings, mixes, and voice memos stay on your device — we never receive your files.

Preset or target size

Pick High, Balanced, or Small quality presets, or set an exact megabyte target and let the audio compressor find the best bitrate automatically.

Extract from video

Drop an MP4 or MOV clip and the audio compressor extracts and shrinks the audio track to a smaller MP3 or AAC file — handy for screen recordings and social clips.

Pairs with our audio tools

Use this audio compressor alongside Audio Converter, Vocal Remover, and Audio Editor for a full local audio workflow without desktop software.

Audio compressor FAQ

Is my audio uploaded to a server?+

No. This audio compressor runs entirely in your browser using WebCodecs. Encoding happens on your CPU and the compressed file downloads directly — we never store or see your audio.

Can I compress WAV or FLAC without quality loss?+

To shrink file size you need a lossy format (MP3, AAC, Opus). The audio compressor re-encodes WAV and FLAC to your chosen lossy format at the best bitrate for your preset or target size.

How does target file size mode work?+

The audio compressor binary-searches the highest bitrate that keeps the output under your megabyte target — useful when a platform or email provider enforces a strict size limit.

What is the maximum file size?+

500MB per file, same as our other browser audio tools. For very large archives, desktop FFmpeg may be faster, but this audio compressor handles most podcasts, songs, and voice recordings easily.

Free Audio Compressor

Continue your creative workflow

How this audio compressor works

Add a file

Choose settings

Compress & download

Why use this free audio compressor?

Nothing leaves your browser

Preset or target size

Extract from video

Pairs with our audio tools

Audio compressor FAQ

Free Audio Compressor

Continue your creative workflow

How this audio compressor works

Add a file

Choose settings

Compress & download

Why use this free audio compressor?

Nothing leaves your browser

Preset or target size

Extract from video

Pairs with our audio tools

Audio compressor FAQ