MP3 Compressor
Free online MP3 compressor. Reduce MP3 file size instantly with no signup and no server uploads.
Compress MP3 files to a smaller size by selecting your target bitrate. Perfect for shrinking music files before emailing, uploading to Discord, or saving storage space. All processing runs in your browser using WebAssembly. Your files stay on your device. Need to compress WAV, OGG, or FLAC? Use our general audio compressor. Want to trim before compressing? Try the audio trimmer.
Drop MP3 files here
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Only .mp3 files accepted
How to Compress MP3 Files
- 1Upload your MP3 files
Click or drag and drop one or more .mp3 files into the upload area.
- 2Pick a target bitrate
64 kbps for voice and podcasts, 128 kbps for everyday music, 192 kbps for high quality, or 320 kbps for maximum quality with some size savings over unoptimized files.
- 3Download compressed MP3
Click Compress MP3 and download your smaller files. Share them via email, upload to Discord, or free up storage.
Frequently Asked Questions
How do I compress an MP3 file?
Upload your MP3 file above, choose a target bitrate (lower means smaller file), and click Compress MP3. The compressed file downloads instantly. Everything runs in your browser.
What bitrate should I use for MP3 compression?
64 kbps works well for voice recordings and podcasts. 128 kbps is the sweet spot for most music. 192 kbps keeps near-original quality. 320 kbps is the maximum MP3 bitrate, useful for slight size reduction from unoptimized files.
Does compressing an MP3 reduce audio quality?
Lowering the bitrate removes some audio data, so yes. Most people cannot hear the difference at 128 kbps and above. For lossless audio, consider converting to FLAC with our WAV to MP3 converter or keeping the original WAV file.
Is my MP3 file uploaded to a server?
No. All compression runs directly in your browser using WebAssembly (FFmpeg). Your MP3 files never leave your device. Nothing is stored or transmitted.
How much smaller will my MP3 get?
It depends on the original bitrate. A 320 kbps MP3 compressed to 128 kbps shrinks by roughly 60%. A 192 kbps file compressed to 64 kbps gets about 65-70% smaller. If you need to compress other audio formats like WAV or FLAC, use the audio compressor.
Can I compress multiple MP3 files at once?
Yes. Upload several MP3 files and compress them all in one batch with the same bitrate setting. Download them individually or all at once.