Compress MP3

1. Upload your MP3 file (up to 50 MB).
2. Choose a target bitrate (96, 128, 192, or 256 kbps).
3. Click 'Compress MP3' — takes 5-15 seconds.
4. Download the smaller MP3.

MP3 files can shrink 40-70% by lowering the bitrate from 320 to 128-192 kbps. For most listeners, 192 kbps is indistinguishable from 320 kbps — same music, half the size.

MP3 files are often larger than necessary — a 320 kbps track takes 2-3x the space of a 128 kbps version with no audible difference on most playback gear. Compressing MP3 lowers the bitrate to a target size, saving storage and bandwidth while keeping the music enjoyable.

The compressor decodes the MP3 audio and re-encodes it at a lower bitrate using LAME. Metadata (artist, album, cover art) is preserved. The output is a smaller MP3 with the same duration and playback compatibility.

• Fitting more music on a phone or SD card.
• Reducing storage for a music library.
• Meeting upload size limits for podcasts.
• Sharing MP3s by email without hitting caps.
• Reducing cloud storage costs for MP3 archives.
• Preparing MP3s for mobile playback.
• Shrinking a DJ or demo collection.

192 kbps is transparent for most listeners on most gear. 128 kbps is fine for phones and casual listening. 96 kbps is acceptable for podcasts and voice recordings. Re-encoding adds slight generational loss, so start with the highest bitrate source.

• Lossy→lossy conversion adds slight generational loss.
• Very low bitrates (below 96 kbps) show audible artifacts.
• Repeated compression degrades quality quickly.
• Metadata may be partially lost depending on the source.
• For true lossless archiving, keep the original.

• Output MP3 plays on every device, player, and OS.
• Works with iTunes, Windows Media Player, VLC, phones, car stereos.
• Metadata and album art preserved.
• Standard MP3 — no special software needed.
• Accepted by every audio platform.

• 192 kbps is the sweet spot — 40-50% smaller, no audible loss.
• 128 kbps is fine for phones and casual listening.
• For critical listening, keep the original or use FLAC.
• Metadata is preserved — your tags stay intact.
• Batch-compress up to 50 MB at once.

Sound quality is audibly worse

The bitrate was too aggressive. Use 192 kbps or higher for music. 96-128 kbps is only for podcasts and voice.

Metadata or album art is missing

Metadata preservation depends on the source. If the MP3 lacked tags, the output will too.

File is barely smaller

The source may already be at a low bitrate. Check the source bitrate before compressing.

• Fraunhofer IIS — MP3