FLAC to MP3 Converter — Convert Lossless Audio Online
Convert FLAC lossless audio files to MP3 format online with selectable bitrate. Browser-based converter using FFmpeg WebAssembly — fast and private.
Drag & drop or click to upload
Supports .flac
Great — Balanced quality and size. Good for most music listening.
Result
Upload a FLAC file and hit convert to generate your MP3.
FLAC → MP3 in Seconds
FLAC files sound amazing but are too large for phones, car stereos, and streaming. Convert your lossless audio collection to compact MP3 files with selectable bitrate — entirely in your browser with zero privacy concerns.
Key Features
Selectable Bitrate
Choose 128, 192, 256, or 320 kbps to balance quality versus file size for your needs.
Audio Preview
Listen to your converted MP3 instantly in the browser before downloading to verify quality.
100% Private
All conversion happens locally via FFmpeg WebAssembly. Your audio files never leave your device.
Fast Processing
Powered by FFmpeg WebAssembly for near-native conversion speeds right in your browser tab.
Common Use Cases
Music Library
Shrink your FLAC music collection up to 10x for portable players, phones, and car stereos
Streaming
Prepare tracks for upload to platforms that require or prefer MP3 format audio files
Sharing
Create smaller MP3 files for email, messaging, or uploading to websites and cloud storage
How this FLAC to MP3 Converter works
This audio converter transforms FLAC (Free Lossless Audio Codec) files into MP3 format using FFmpeg WebAssembly running entirely within the browser. The tool loads the FFmpeg engine from a CDN, writes the FLAC file to FFmpeg's virtual filesystem, then executes the transcoding command with the user-selected bitrate (128, 192, 256, or 320 kbps) using the LAME MP3 encoder.
FLAC is an open-source lossless codec that compresses audio to roughly 50-70% of the original WAV size without discarding any data. MP3 is a lossy format that achieves much higher compression (often 10:1 or better) by discarding audio frequencies deemed less perceptible to human hearing using psychoacoustic models. At 320 kbps, the highest MP3 bitrate, the quality difference from the FLAC source is nearly imperceptible to most listeners.
FFmpeg's progress events update a real-time progress bar during encoding. The -map_metadata 0 flag preserves ID3 tags (artist, album, title) from the source FLAC file in the output MP3. Privacy is guaranteed by the browser-local processing model — FLAC files are never transmitted to any server. The built-in HTML5 audio player enables immediate preview of the converted MP3.
How to Use
Upload FLAC file
Drag and drop or click to select a FLAC audio file from your device.
Select bitrate
Choose your desired MP3 bitrate: 128, 192, 256, or 320 kbps.
Convert & download
Click Convert — preview the audio and download your MP3 file instantly.
Example Usage
A lossless FLAC music track converted to a compact MP3 at 192 kbps for portable listening.
Frequently Asked Questions
What is a FLAC file?
Why convert FLAC to MP3?
What bitrate should I choose?
Is there any quality loss?
Is my audio file uploaded to a server?
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The FLAC to MP3 Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.
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