Audio Compressor Online Free
A free audio file compressor for reducing file size while keeping quality. Supports MP3, WAV, FLAC, OGG, AAC, and other formats with adjustable quality settings — all in your browser.
Shrink any audio file while keeping it sounding great
Drop audio file here
or click to browse
Features
How to Compress Any Audio File
- Drop your audio file onto the page — format is detected automatically
- Review the detected codec and adjust compression settings or pick a preset
- Check the estimated file size and reduction percentage
- Click Compress and download the smaller file in the same format
Frequently Asked Questions
Which audio formats are supported?
MP3, WAV, FLAC, M4A (AAC in MP4), OGG Vorbis, raw AAC (ADTS), AIFF, WMA, and OPUS. The tool automatically detects the format from the file header, not just the extension, so renamed files work too.
Why use a universal compressor instead of a format-specific one?
If you work with multiple formats or receive files from different sources, a universal tool saves time — no need to figure out the format first or switch between tools. Our compressor auto-detects the codec and shows only the relevant settings.
Does the output format match the input?
By default, yes — an MP3 stays MP3, an OGG stays OGG. You can optionally convert to a different format during compression if needed, for example converting WAV to MP3 for a much smaller file. For full format control, use the audio converter.
How is lossless compression different from lossy?
Lossless formats (WAV, FLAC, AIFF) store every audio sample exactly. Compressing them means reducing bit depth, sample rate, or converting to a lossy codec. Lossy formats (MP3, AAC, OGG) already discard inaudible data; compressing them further means re-encoding at a lower bitrate, which reduces more detail.
Are my files uploaded to a server?
No. All processing happens in your browser using FFmpeg WebAssembly technology. Your audio files never leave your device. A server-side fallback is available for browsers that do not support WebAssembly.
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