Compress Audio
Reduce an audio file's size by re-encoding at a lower bitrate you control.
An uncompressed WAV recording or a high-bitrate audio file can be far larger than necessary for voice content, podcasts, or casual music sharing, where a lower bitrate is imperceptibly different to most listeners but produces a dramatically smaller file — useful for email attachments, storage-constrained uploads, or faster streaming.
This tool re-encodes your audio as MP3 at a bitrate you choose — 128 kbps for maximum size reduction (still solid quality for spoken word), 192 kbps as a balanced default, or 320 kbps for near-transparent quality with more modest size savings. Processing uses a real ffmpeg engine running in your browser, the same encoding technology used by professional audio software.
Because everything happens on your device, there's no upload wait and your audio (which might be a private voice memo or unreleased music) never leaves your device.
How to use Compress Audio
- 1
Upload your audio file
Drop the audio file you want to compress into the upload area.
- 2
Choose a bitrate
Lower bitrate means smaller file size; higher bitrate preserves more audio detail.
- 3
Click Compress & Download
See your before/after file size, then download the compressed MP3.
Features
- Three bitrate presets balancing size and quality
- Shows exact before/after file size comparison
- Real MP3 encoding via a genuine ffmpeg engine
- No file upload — processed entirely on your device
Frequently asked questions
Common mistakes to avoid
- Compressing an already low-bitrate MP3 down further, which can introduce noticeable quality degradation.
- Choosing 320 kbps when the priority is actually maximum file size reduction — that setting saves the least space.
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