MP3 Compressor
Pick a quality, keep what matters. Free, fast, no signup.
One file at a time for now
Batch processing isn't available yet: drop files one by one, or use the Merger to join them.
- Free, no signup
- No watermark, ever
- Files auto-delete in 1 hour
- Nothing to install
MP3 is the format that taught music to travel: small, scrappy, and welcome absolutely everywhere. MPEG-1 Audio Layer III. Perceptual coding: it throws away the parts of the signal your ear is least likely to miss.
- Born
- 1993, Fraunhofer Institute, Germany
- Type
- audio · lossy
- Typical size
- about 1 MB per minute at 128 kbps: roughly a tenth of CD audio
- Plays on
- Everything. Phones, browsers, cars, smart speakers, ancient iPods.
- Fun fact
- Engineers tuned MP3 against Suzanne Vega's 'Tom's Diner': she's been called the mother of the MP3.
What compressing MP3 actually does
MP3 is already lossy-compressed, so compressing it further means re-encoding at a lower bitrate. Realistic savings run 30–70%, depending on how generous the original bitrate was: MP3 typically runs about 1 MB per minute at 128 kbps: roughly a tenth of CD audio. Squeeze too hard and you will hear it; Flippy's presets stay on the polite side of that line.
Questions people ask
How much smaller will my MP3 get?
It depends on how generously it was encoded: MP3 typically runs about 1 MB per minute at 128 kbps: roughly a tenth of CD audio, and most files give up 30–70% at the medium preset before quality visibly suffers.
Will I lose quality working with MP3 here?
MP3 is a lossy format, so re-encoding trims a little detail each time. Work from the best source you have and convert once: at sensible bitrates the difference stays inaudible.
Is this MP3 compressor really free?
Yes: free for everyday use with no daily cap, no signup, and your files delete themselves from our servers within an hour. Pro exists for heavy days: bigger files, whole folders at once.