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MP3 Compressor

Shrink MP3 files by lowering bitrate with quality presets — fit podcasts into feed limits. Cut a 50 MB episode to 15 MB cleanly — local FFmpeg work, unlimited saves.

Runs on FFmpeg

100% Local Browser Native

How to Use the MP3 Compressor

1. Upload MP3s

Episodes or tracks to slim down.

2. Set target bitrate

64–128k voice, 128–192k music.

3. Download compressed

Save the files (downloads are unlimited).

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Frequently Asked Questions

What bitrate for spoken word?

64–128 kbps mono for talk (the tool offers 32, 64, 128, and 192 kbps): a 50 MB stereo music-encode episode drops near 15 MB at 64k with zero audible loss on voices. Music needs 128–192 kbps stereo minimum.

Will listeners hear the difference?

Not on voice at 96k+ or music at 128k+ through earbuds and laptop speakers. Audiophile setups reveal artifacts first — keep FLAC masters regardless.

How small do shared files get?

Roughly proportional to bitrate ratio: 320→128 kbps cuts ~60%. A 30-minute 320k file (~72 MB) lands near 29 MB at 128k.

Are my MP3s uploaded?

No — compression runs locally in your browser with FFmpeg. Saves never touch a meter — downloads on local tools are unlimited.

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Last updated October 2026