Converting MP3 to FLAC wraps the decoded audio in a lossless compressor. The result is typically 3–4× larger than the MP3 but decodes bit-perfectly every time, which matters to library software that prefers a single canonical format across your collection.
Drag & drop audio files here, or browse
Drop your MP3 files here
FLAC will not undo MP3's lossy compression; the encoding artifacts travel with the audio. What changes is the container: FLAC supports richer tagging, ReplayGain, embedded cue sheets, and verification via MD5 of the decoded stream.
FLAC plays on Windows, macOS, Linux, Android, and every major music player (VLC, foobar2000, Kodi, Plex, Roon). Native iOS support arrived in 2017, and Apple Music can import but prefers ALAC. Car stereos and older devices may not decode FLAC.
MP3 is the most widely supported lossy audio format. Encoded in 1993 and still the default on countless devices, it trades some fidelity for dramatically smaller files. At 192 kbps most listeners cannot distinguish it from the source. Anything that plays audio will play MP3.
FLAC is a lossless compressor: it shrinks PCM audio to roughly 50–60% of its original size and decodes back to a bit-perfect copy. It supports tags, cue sheets, and up to 32-bit / 655 kHz, which makes it the de facto format for CD rips and audiophile music libraries.
Only if your library or player specifically works better with FLAC. You won't gain any audio quality; the MP3 was already lossy, and FLAC just stores whatever comes out of decoding it.
FLAC stores full PCM samples compressed losslessly (no data discarded), while MP3 is aggressively lossy. FLAC typically ends up 3–4× the MP3's size for the same audio.
MP3 is the most widely supported lossy audio format. Encoded in 1993 and still the default on countless devices, it trades some fidelity for dramatically smaller files. At 192 kbps most listeners cannot distinguish it from the source. Anything that plays audio will play MP3.
FLAC is a lossless compressor: it shrinks PCM audio to roughly 50–60% of its original size and decodes back to a bit-perfect copy. It supports tags, cue sheets, and up to 32-bit / 655 kHz, which makes it the de facto format for CD rips and audiophile music libraries.
Yes. The converter runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio files are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Files over about 2 GB total can get slow or hit browser memory limits. Process in smaller batches if you run into issues.