Turn a lossless FLAC file into a smaller, more shareable MP3.
The FLAC to MP3 converter turns FLAC audio (Free Lossless Audio Codec) into MP3 (MPEG-1/2 Layer III) directly in your browser. FLAC is lossless but large and unsupported by many phones and car stereos; MP3 is small and universal.
FLAC is lossless compression — typically 50–60% of the size of the equivalent WAV while decoding bit-identically. MP3 is the most universally supported lossy format; plays on virtually every phone, car stereo, browser and editor. Going from FLAC to MP3 discards some audio information to save space. Choose a high bitrate (192–320 kbps for music, 96–128 kbps for speech) to keep the result close to the original.
Your file is decoded to 32-bit floating-point samples by the browser’s own audio decoder — and at the file’s own sample rate, not a resampled one. You can optionally resample or switch channels. It is then encoded to MP3 on your device; for a lossy target the result is decoded again for the preview, so you hear what you will get. Typical size: about 1 MB per minute at 128 kbps, 2.4 MB at 320 kbps.
Source format facts: FLAC files are lossless; usual bandwidth: full bandwidth, exactly as recorded. Target facts: MP3 is lossy; usual bandwidth: typically low-passed at 16–20 kHz depending on bitrate.
Fit a library on limited storage.
Many don’t read FLAC.
Smaller files to send.
Light files for devices.
| From | FLAC — Free Lossless Audio Codec |
|---|---|
| To | MP3 — MPEG-1/2 Layer III |
| Direction | lossless → lossy |
| Typical size | about 1 MB per minute at 128 kbps, 2.4 MB at 320 kbps |
| Tags | FLAC: Vorbis comments → MP3: ID3 |
A 5–6 MB/min FLAC becomes about 1.4–2.4 MB/min as 192–320 kbps MP3.
No, MP3 is limited to 48 kHz and lossy.
FLAC decoding support varies slightly by browser. If a file won't open, try the latest version of Chrome or Firefox.
Going to WAV is lossless. Going to MP3 uses a standard 192kbps encode by default (adjustable), which is transparent for most listening but is a lossy step if your source was uncompressed.
No — the file is decoded and re-encoded entirely in your browser using the Web Audio API and, for MP3, a small bundled encoder. Nothing is sent anywhere.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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