FLAC to MP3 Converter
Convert a FLAC file to MP3 in your browser. FLAC keeps audio bit-perfect but the files are massive — 30-50MB per song. MP3 trades a tiny amount of quality for files 4-10× smaller, which is what you want for phones, streaming, and sharing. The conversion runs locally; nothing uploads.
-
Stays on your device
Your audio is decoded into your browser's memory by the Web Audio API, re-encoded by a JavaScript library running in the same tab, and the result goes straight to your downloads. No upload, no log, no third party. Sensitive recordings, voice memos, copyrighted tracks — none of it leaves your machine.
-
FLAC → MP3 done right
FLAC is lossless and the closest you can get to the original recording. MP3 at 320 kbps is the highest-quality lossy MP3 — recommended when starting from FLAC since you have the headroom. 192 kbps is still excellent if file size matters more than maximum fidelity.
-
Quality control
Pick the MP3 bitrate that matches your use case — 128 kbps for podcasts and voice (smaller files), 192 kbps for music (our default, near-CD quality), or 320 kbps for archival (best fidelity, largest files).
Frequently asked questions
Does my audio ever leave my device?
No. The conversion runs entirely in your browser. We decode your file using the Web Audio API and re-encode it using a JavaScript encoder library, all in your browser tab. Open DevTools while you convert — you'll see zero traffic carrying your audio.
Is there a file size limit?
No fixed limit from us. The real ceiling is your device's memory: decoded audio sits in RAM as raw PCM, which is roughly 10 MB per minute of stereo audio at 44.1 kHz. A typical 5-minute song needs about 50 MB of working memory — fine on any modern phone or laptop. Hour-long podcasts may struggle on older devices.
Will the conversion change the audio quality?
MP3 is a lossy format, so encoding to MP3 always involves some quality loss compared to the source. At 192 kbps (our default), the difference is inaudible to most listeners on most playback hardware. WAV is lossless — if you're converting TO WAV, the output is bit-identical to what your source decoded into. If you're converting FROM a lossy source (MP3, M4A), the WAV won't be higher quality than the source — it'll just be uncompressed.
How long does conversion take?
Decoding is near-instant. Encoding speed depends on output format: WAV is essentially instant (just writing bytes). MP3 takes about 1 second of compute per 10 seconds of audio on a modern laptop — so a 5-minute song encodes in roughly 30 seconds. Phones are slower; expect 2-3x longer. Progress is shown live as the encoder works.
Does this work on mobile?
Yes. Tap the drop zone to open the file picker, choose your audio file, hit Convert. The result downloads to your device's standard download location. iOS users: the file lands in the Files app under Downloads.
What about ID3 tags (artist, album, song title)?
Original ID3 tags are not preserved in v1 — the encoded file gets no metadata. The audio itself is preserved exactly. If you need to keep artist/album/title info, you'll want to re-tag the output with a tool like MP3Tag (Windows) or Kid3 (cross-platform) after converting.
What bitrate should I use coming from FLAC?
320 kbps if you want to preserve as much of FLAC's quality as MP3 can hold — this is the standard recommendation for converting lossless sources. 192 kbps (our default) is still excellent and noticeably smaller. 128 kbps is fine for casual listening but throws away some of the headroom you paid for by starting with FLAC.
Will the MP3 sound as good as the FLAC?
Not bit-perfectly — MP3 is lossy and discards some audio information. But at 320 kbps, the difference is essentially academic; double-blind listening tests consistently show most people can't tell. At 192 kbps the difference is still below the audibility threshold for most listeners. If you want bit-perfect copies, keep your FLAC archive intact and only convert the copies you carry around.
Why convert FLAC to MP3 at all?
Compatibility and size. FLAC files are huge — a single album can be 300MB. MP3 at 320 kbps cuts that to ~80MB while sounding nearly identical for most listeners on most playback gear. MP3 also plays on every device ever made; FLAC support is common but not universal (some car stereos, older phones, fitness watches still don't handle it).
Does this need a fast browser?
Yes — FLAC decoding requires Chrome 56+, Firefox 51+, or Safari 16+. If your browser is older, the decode will fail with a clear error. Update your browser or try Chrome / Firefox.