Audio Compressor — Free Online
WAV recordings and high-bitrate songs can be painfully large to send. Pick a sensible preset, see the estimated MP3 size before you start, then listen and download.
Drop audio to compress
Shrink WAV, MP3, M4A and other audio for sharing & uploads
100% private — processed on your deviceHow to use the Audio Compressor
- 1
Add your audio file
We show its duration and estimate its current average bitrate so you can choose a lower one confidently.
- 2
Pick speech, balanced or quality
Speech uses compact mono; balanced 128 kbps suits most sharing; 192 kbps keeps more music detail. Custom settings are there if you need them.
- 3
Compress & compare
The result player lets you check the sound, and the before/after sizes show exactly how much you saved.
Why use Tools Stars for this?
- Huge savings when converting uncompressed WAV to MP3
- Speech preset for lectures, bayan, podcasts and voice notes
- Estimated output size before encoding begins
- Custom bitrate, mono/stereo and sample-rate controls
- Listen-before-download preview for every result
Frequently asked questions
Which preset should I choose?
Lectures and voice: Speech. Songs for WhatsApp or general sharing: Balanced 128 kbps. Music you care about: High-quality 192 kbps. Lower bitrate always means a smaller file but gradually less detail.
Why might my MP3 not get smaller?
If the original is already a 64 kbps MP3, re-encoding it at 128 kbps cannot create missing quality and will make it larger. Choose a bitrate below the original estimate shown above the presets.
What is mono, and when is it better?
Mono combines left and right channels into one. For a single voice recording there is usually no stereo information worth keeping, so mono can sound equally clear at a much lower bitrate. Keep stereo for music.
Can compression damage my original file?
No. The compressor creates a separate MP3 and never changes the file on your device. Keep the original if it is an important recording.
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