Compress MP3
To compress an MP3, pick the file and press Compress MP3. The tool re-encodes it at 96 kbps by default, and file size follows bitrate, so that is half the size of a 192 kbps MP3.
Drop an MP3 here
or
MP3
Up to 2 GB on a computer and 1 GB on a phone, because your device does the work. You can also paste a file.
Stays on your device
Your file is never uploaded
Up to 2 GB
On a computer
MP3 out
Ready to download
How it works
- Pick an MP3 from your device.
- Choose a lower MP3 bitrate. The default is 96 kbps.
- The tool decodes the MP3 and encodes it again at the bitrate you chose.
- If the bitrate you chose is not lower than the original, the tool stops and says so.
- Download the smaller MP3.
Facts
- Where it runs
- In your browser, on your device. Nothing is uploaded
- Input format
- MP3
- Output format
- MP3
- Quality choices
- 64 to 320 kbps. The default is 96 kbps
- Size rule
- File size follows bitrate, so 96 kbps is half the size of 192 kbps
- Max file size
- 2 GB on a computer, 1 GB on a phone
- Browsers
- Chrome and Edge 94 or later, Firefox 130 or later, Safari 26 or later
Questions
How do I make an MP3 file smaller?
Pick the MP3 on this page and press Compress MP3. The default of 96 kbps halves the size of a 192 kbps file.
Which bitrate should I pick for speech?
Speech stays clear at 64 kbps, which gives the smallest file. For music, 128 kbps or more gives a better result.
Why did the tool say my bitrate is not lower?
Compressing needs a bitrate lower than the original. Pick a smaller option from the list and try again.
Does compressing an MP3 reduce quality?
Yes, a little. Fewer bits per second leave less room for fine detail, so the loss is larger at the bottom of the list.