Reduce MP3 file size with quality presets or a custom 32-320 kbps bitrate, process up to 10 files, and preview the estimated output size.
Drop audio here to reduce its file size, or import from:
Choose quality, a reduction percentage, or a target size.
An MP3 compressor reduces MP3 file size by re-encoding the audio at a lower bitrate. Fewer kilobits per second create a smaller file, while a higher bitrate retains more of the source detail.
Use it to create a smaller MP3 copy for storage, sharing, web delivery, and upload limits while keeping the original file unchanged.
Choose High Quality, Balanced, Small File, or Voice, or set a custom bitrate from 32 to 320 kbps.
Shrink each MP3 proportionally or work toward a specific file-size limit in MB.
Apply the same settings to a group, process files sequentially, and download the results individually or as a ZIP.
Use the track duration and compression settings to preview the approximate output size before encoding.
Start with the original MP3 when possible so the audio is not repeatedly re-encoded.
Drop one MP3 into the compressor or switch to Batch Compress and add up to 10 files.
Select a quality and bitrate, enter a percentage reduction, or set a target output size in MB.
Check the expected output before processing and adjust the setting when the file needs to fit a stricter limit.
Run local browser processing, compare the original and final sizes, listen to the result, and save the compressed MP3.
A smaller MP3 transfers faster and uses less storage, but stronger compression also removes more audio detail.
Reduce interviews, demos, lessons, and voice notes before attaching or sharing them.
Use Target Size when a form, learning platform, website, or publishing system specifies a maximum number of megabytes.
Create a smaller MP3 for previews, portfolio pages, podcasts, and other bandwidth-sensitive playback.
Keep a high-quality original archived and create smaller listening copies for everyday use.
These bitrates are practical starting points. The best setting depends on the source and how closely listeners will inspect the audio.
| MP3 bitrate | Relative file size | Recommended use |
|---|---|---|
| 320 kbps | Largest | High-quality listening when size reduction is secondary |
| 192 kbps | Large | Detailed music, ambience, and finished mixes |
| 128 kbps | Medium | Balanced everyday listening, uploads, and sharing |
| 96 kbps | Small | Web, mobile, previews, and casual playback |
| 64 kbps | Very small | Speech, meetings, lectures, and voice notes |
If the source MP3 already uses a lower bitrate than the selected output, recompression may make it larger without restoring lost detail.
Upload the MP3, choose a lower bitrate, a percentage reduction, or a target size, then compress and download the new file.
Use 192 kbps for detailed music, 128 kbps for balanced everyday audio, 96 kbps for smaller web or mobile files, and 64 kbps for speech.
Yes. Target Size calculates a bitrate from the track duration and requested MB value, then tightens the result when needed. Leave a small margin below a strict external limit.
Yes. Batch Compress accepts up to 10 files and processes them one at a time to reduce browser memory pressure.
Usually yes. MP3 is lossy, so lowering the bitrate removes more encoded detail. Keep the original and listen to the result before replacing any file.
The source may already use a lower bitrate than the selected setting. Choose a lower bitrate or keep the original when it is already efficiently encoded.
Files selected from your device are processed in your browser. Link, Dropbox, or Google Drive imports first use the selected provider and configured import service.
Edit one or more audio files with a browser-based timeline and export in popular formats.
Batch compress up to 10 files and export MP3, M4A, OGG, or configurable PCM WAV.
Match a sample-peak or LUFS target, compare the original and normalized audio, then export WAV, MP3, M4A, FLAC, or OGG.
Set the peak, shape lows, mids, and highs, control the final ceiling, compare, and export a mastered WAV.
Boost audio up to 300% or normalize it to a consistent -16 LUFS level.
Select a waveform section, add fades, loop-preview it, and export for iPhone or Android.
Select a waveform section, repeat it, smooth every join, then slow down, speed up, transpose, and export.
Update embedded title, artist, album, date, genre, track, comments, and supported cover art.
