Compress MP3
Make MP3 files smaller in seconds. Up to five at a time, private and free.
1 · Choose your files
Drag & drop audio or video files here, or click to browse
Up to 5 MP3 files, max 200 MB each
2 · Choose the strength
All processing runs on your own device with ffmpeg compiled to WebAssembly; nothing is uploaded.
3 · Collect your files
Results appear here with a player. Download them one by one or grab everything as a ZIP.
How to compress MP3 files
- Drop your MP3 files into the box above.
- Pick the bitrate: 96 kbps is a good balance for speech and casual listening.
- Click Compress MP3, check the savings on each card and download.
About the MP3 format
MP3 (MPEG-1 Audio Layer III) is the most widely supported audio format there is: every phone, car stereo, browser and player reads it. It is lossy, storing music at a fraction of the size of the original by removing detail the ear is least likely to notice. At 192 kbps or more it is transparent for most listeners.
Frequently asked questions
How much smaller will my MP3 get?
It depends on the source bitrate. A 320 kbps MP3 becomes about 70 percent smaller at 96 kbps, a 192 kbps file about 50 percent smaller; a file already at 96 kbps or less barely changes, so pick 64 kbps for it.
Does compressing MP3 lose quality?
A little. Lower bitrates discard the least audible detail first. Speech and podcasts survive 64 to 96 kbps well; keep 128 kbps for music.
Which bitrate should I pick?
128 kbps for music, 96 kbps for speech and mixed content, 64 kbps when size matters most, for example voice memos sent over messaging apps.
Can I compress several files at once?
Yes. Add up to 5 MP3 files of up to 200 MB each; each result card shows its own savings, and a ZIP collects them all.
Are my files uploaded?
No. Everything runs in your browser. Your MP3 files never leave your device.
Is this MP3 compressor free?
Yes, completely, with no sign-up and no watermark. The site is supported by ads.
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