Which bitrate is best for email or messaging?

64 kbps for voice and minimum size; 128 kbps if you want more clarity. Use 192 kbps if quality is the priority.

What if my car won’t play the file?

Use MP3 at 128 kbps with simple filenames. If issues persist, format the USB to FAT32 and place files in the root folder.

Compress MP3 online (MP3 → MP3)

Online MP3 compressor — lighter MP3 converter

Make your MP3s smaller by lowering the bitrate (e.g., 64–128 kbps for voice). 100% in the browser: a lightweight tool, no installs.

Reduce the size of your MP3 files without the hassle. Upload your audio, choose 64, 128 or 192 kbps, and download instantly. Works on Android, iPhone, PC, and Mac.

Compress MP3 now How it works

compress mp3
reduce mp3 size
mp3 to mp3 64/128/192 kbps
send mp3 by email (smaller)
car-compatible mp3

When should you recompress an MP3?

If your MP3 is too big to send by email, store on your phone, or use in your car, recompressing it to a suitable bitrate drastically reduces the size with minimal quality loss for voice and general use.

Benefits of compressing

Lighter files (perfect for email or cloud).
Smoother playback on cars and older devices.
Save space on phones and USB drives.

Which quality to choose (64/128/192 kbps)

64 kbps: voice/audiobooks, minimum size (best in mono).
128 kbps: recommended balance of quality/size.
192 kbps: music with more detail or light editing.

Approx. size per minute: 64 ≈ ~0.47 MB • 128 ≈ ~0.94 MB • 192 ≈ ~1.41 MB.

How to use the MP3 → MP3 compressor

Upload your .mp3 file in the form.
Choose the final quality: 64 / 128 / 192 kbps.
Download the optimized MP3, ready to share or play.

Tips for voice

For dictations, interviews, or notes, use mono and 64/128 kbps. You’ll save a lot of space without losing clarity.

Music & car stereos

128 kbps works on virtually all car systems. Use 192 kbps if you notice artifacts in very dynamic passages.

Compress another MP3

Related guides & tools

Frequently asked questions

Do I lose quality when recompressing MP3?

A little (it’s lossy compression). For voice and general use, 128 kbps is usually transparent. To maximize savings, 64 kbps works well for voice.

What bitrate is best for email or WhatsApp?

To cut size, use 64 kbps (voice) or 128 kbps (voice + light music). If you want maximum clarity, go with 192 kbps.

My car won’t play the file — what can I do?

Use MP3 at 128 kbps with simple filenames. If it still fails, format the USB to FAT32 and place the MP3s in the root folder.

Compress your MP3s in seconds and share without limits. Choose 64/128/192 kbps and forget about compatibility issues or oversized files.