How to convert an MP3 into a lighter MP3
If you have an MP3 that’s too large and you want to send it quickly via WhatsApp, email, or upload it to the cloud, recompress it with a lower bitrate. This reduces size while keeping full compatibility.
How to compress an MP3 (step by step)
- Open the MP3 compressor.
- Upload your
.mp3file. - Choose a lower quality: 128 kbps or 96/64 kbps for voice.
- Click Convert and download your lighter MP3.
Which bitrate should I choose?
| Use | Recommended bitrate | Notes |
|---|---|---|
| Music | 128/192 kbps | Good quality/size balance. |
| Podcast / voice | 64–128 kbps | Clear voice; for mono, 96 kbps is usually enough. |
| Sharing via WhatsApp/email | 64–96 kbps | Very small file with good intelligibility. |
Approximate size per minute
Indicative values (CBR); actual size may vary:
| Bitrate | MB/min approx. | Typical use |
|---|---|---|
| 64 kbps | ~0.47 MB | Very light voice (long sends) |
| 96 kbps | ~0.70 MB | Podcast/voice |
| 128 kbps | ~0.94 MB | Clear voice / basic music |
| 160 kbps | ~1.17 MB | Music |
| 192 kbps | ~1.41 MB | More detailed music |
Common use cases
- Shrink a long podcast to save space.
- Send MP3 audio via email.
- Optimize phone recordings for the cloud.
- Improve compatibility for WhatsApp audios.
Other compatible formats
Besides recompressing MP3, you can convert:
Extra tips
- Avoid multiple re-encodes (MP3 → MP3 → MP3…); do a single conversion to the target bitrate.
- Mono for voice: if your tool allows it, use mono for interviews/notes (same clarity with fewer kbps).
- VBR: when available, variable bitrate often yields better quality at the same size than CBR.
- Normalize volume after converting (e.g., with Audacity) if the audio ended up too quiet.
- Keep files organized with date + topic, e.g.,
2025-08-28-interview.mp3. - Privacy: files are processed only for conversion and aren’t shared with third parties.
Frequently asked questions
What bitrate is best for voice?
Typically 64–128 kbps in mono. Clear voice and small files.
Is there quality loss when recompressing?
Yes: every lossy conversion reduces fidelity a bit. Do a single conversion to your final bitrate.
Does it work on mobile?
Yes, you can upload and recompress an MP3 from Android or iPhone using the browser.