How do I compress an audio file?

Pick a target bitrate, drop your file onto the tool above, and it re-encodes to a smaller MP3 in your browser. Preview it, then download — no account needed.

Does my file get uploaded?

No. Compression runs entirely in your browser — your audio never leaves your device, so even large files stay private.

Which bitrate should I choose?

Lower bitrate means a smaller file. 128 kbps is a great all-round default for music and voice; 64–96 kbps is fine for spoken-word; 192 kbps keeps more detail for music.

Free tool

Shrink any audio file, instantly.

Runs entirely in your browser. Drop a clip, pick a bitrate, and get a smaller MP3 you can email, upload or store without the bloat. Nothing is uploaded.

Try it

Drop an audio file

The fastest way to make an audio file smaller without installing anything.

Target quality

Lower bitrate = smaller file. 128 kbps is a great all-round default.

Drop an audio file here

MP3, WAV, OGG, M4A, FLAC — up to 100 MB. Re-encodes to a smaller MP3 at 128 kbps.

Runs in your browser via WebAssembly. The first compression loads the audio engine (~once per visit).

How it works

Your audio never leaves your device

The compressor decodes your file and re-encodes it to a lower-bitrate MP3 right in your browser — all on your machine, no server round trip.

Step 1

Pick a bitrate

64, 96, 128 or 192 kbps — lower means smaller.

Step 2

Drop the file

MP3, WAV, OGG, M4A or FLAC — up to 100 MB.

Step 3

Download the MP3

See the size saving, preview, then save.

More free tools

Related free tools

Keep going — every one of these runs free in your browser, no signup.

Audio Format ConverterConvert between MP3, WAV, OGG, M4A and FLAC — right in your browser.Video to Audio ExtractorPull the audio track out of an MP4, MOV or WEBM as MP3 or WAV.Audio to WAVConvert MP3, OGG, M4A or FLAC to 16-bit PCM WAV.Mono ↔ Stereo ConverterDownmix stereo to mono or duplicate a mono track to stereo.

Browse all free tools

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