How to use the MP3 compressor
- Drop your MP3, WAV, M4A, FLAC files onto the box above, or click to choose them.
- Conversion to MP3 starts automatically, right on your device.
- Download each file, or all of them as a ZIP.
What are MP3, WAV, M4A and FLAC files?
MP3 · MPEG-1 Audio Layer III
MP3 is the most compatible audio format in the world. It plays on virtually every phone, car stereo, browser and media player.
WAV · Waveform Audio File
WAV is uncompressed audio. It's the standard for editing and studio work, but files are roughly ten times larger than MP3.
M4A · MPEG-4 Audio
M4A is AAC audio in an MP4 container, used by iPhone Voice Memos, iTunes and many recorders. Some older players and upload forms only accept MP3.
FLAC · Free Lossless Audio Codec
FLAC is lossless compressed audio, popular for music archives. Many phones, cars and apps still don't play it, and files are several times larger than MP3.
Common questions about the MP3 compressor
Are my files uploaded to a server?
No. uqln runs the conversion inside your browser using JavaScript and WebAssembly. Your files never leave your device, which also means there's no upload wait and no size limit beyond your device's memory.
Is it really free?
Yes. There's no account, no watermark and no daily limit. Because the work happens on your device, it costs us almost nothing to run.
Can I convert many MP3/WAV/M4A/FLAC files at once?
Yes. Drop as many files as you like. They're converted one after another, and you can download them individually or all together as a ZIP.