Audio Compressor

Make an audio file smaller without a heavy editor. Choose a bitrate for a predictable quality, or enter a target size in megabytes and let the tool calculate the bitrate that gets close to it. The encoder runs in your browser, so podcast drafts, voice notes and client recordings never leave your device.

Add an audio file

MP3 · WAV · M4A · OGG · FLAC

Drop audio here or click to browse

One file at a time. The length is read as soon as it is added

MP3WAVM4AAACOGGFLACOPUS

Compressed audio

Add audio to start

Your compressed audio will appear here

How to compress an audio file

Add your audio

Drop one audio file into the tool, or click to browse. MP3, WAV, M4A, AAC, OGG, FLAC and Opus are accepted, and the length is read on your device.

Pick a compression mode

Choose Target bitrate to set a quality level, or Target file size to enter the size you need and let the tool work out the bitrate.

Compress and download

Click Compress audio, listen to the result, then download the smaller file. Nothing is uploaded at any point.

Why use Aihangsoft Audio Compressor

Two ways to shrink a file

Set a bitrate when you want predictable quality, or name a target size in megabytes and let the tool calculate the bitrate that lands close to it.

Audio never leaves your device

The encoder runs inside your browser, so voice notes, podcast drafts and client recordings are never uploaded or stored. Files never leave your device.

Live size estimate

The estimated output size updates as you change the mode, bitrate or format, so you can weigh the trade-off before rendering anything.

Built for everyday audio

Target bitrate mode

Pick 64, 96, 128, 192, 256 or 320 kbps. A lower bitrate gives a smaller file, and 128 kbps is the usual balance for spoken word and casual listening.

Use case: podcasts, voice notes, everyday listening

Target file size mode

Enter the size you need in megabytes and the tool works backwards from the duration to a bitrate, then clamps it to a usable range and shows the value it will use.

Use case: email limits, upload caps, messaging apps

MP3, M4A and OGG output

Export to the three formats most players accept. MP3 is the most compatible, M4A gives better quality per kilobyte, and OGG is open and web friendly.

Use case: phones, car stereos, web players

Size and ratio after each run

Every result shows the source size, the output size and the percentage saved, next to an audio preview so you can hear the result before keeping it.

Use case: checking savings, comparing bitrates

Related tools

Audio Converter

Change format, bitrate and sample rate

Audio Trimmer

Cut audio before you compress it

Video to MP3

Extract audio from a video

Audio compression FAQ

Yes. The encoder, FFmpeg compiled to WebAssembly, runs inside your browser tab, so your audio never leaves your device. There is no sign-up, no track limit and no fee, and the compressed files carry no watermark.
That depends on the bitrate you choose, because the size follows it directly. Going from a 320 kbps file to 128 kbps leaves roughly 40 percent of the original size, but a file that is already at 96 kbps has very little left to remove.
The bitrate is clamped between 32 and 320 kbps, so a target that needs a value outside that range gets the nearest usable bitrate and the tool shows what it will use. The estimate is arithmetic from duration and bitrate, and container overhead makes the real file a little larger or smaller than the target.
Yes. MP3, M4A and OGG are lossy formats, so a lower bitrate removes detail from the sound. Listen to the preview before you download, and keep a higher bitrate for music where clarity matters.
No. A file cannot be made smaller losslessly by re-encoding, because the encoder has to decode and then re-encode it, which adds another round of loss. Lossless shrinking only works when the source is uncompressed, such as WAV.
MP3 plays almost anywhere and is the safest choice. M4A sounds slightly better at the same bitrate, and OGG stays fully open and is common on the web.

Compress your audio now

Free, private and unlimited. No account needed.

Upload an audio file