Convert MP3 to FLAC
Convert MP3 to FLAC format instantly in your browser. FLAC provides lossless storage so your audio is preserved bit-for-bit — ideal for archival, DAW import, and streaming services that require FLAC. No upload needed.
Drag 'n' drop files here, or
click to select files
.mp3
Drop your files and click Convert to get FLAC
//when_to_use
When to Convert MP3 to FLAC
- Importing an MP3 backing track into Pro Tools or Logic Pro X which processes FLAC better in some session configurations
- Archiving a music collection in a consistent lossless format while waiting for original lossless sources to be acquired
- Converting MP3 stems to FLAC before uploading to a mastering service that requires lossless input
- Preparing MP3 podcast episodes as FLAC for ingest into an audio archival system that only accepts lossless formats
- Converting MP3 samples to FLAC for import into Ableton Live or FL Studio to prevent additional generation loss during session export
//comparison
MP3 vs FLAC
| Property | MP3 | FLAC |
|---|---|---|
| Compression | LAME MP3 (lossy) | FLAC (lossless) |
| Typical file size (4 min song) | 3-5 MB | 15-25 MB |
| Quality vs original source | Degraded (lossy) | Preserved (no further loss) |
| DAW compatibility | Limited in some sessions | Universal |
| Editing without generation loss | No | Yes |
| Streaming (Tidal, Qobuz) | Lossy tier | HiFi/Master tier |
//how_it_works
How It Works
Drop your MP3 files
Drag and drop or select MP3 audio files. Any bitrate or sample rate is supported. First use loads FFmpeg WASM (~30MB).
FFmpeg decodes MP3 to PCM
FFmpeg WASM decodes the MP3 frames to raw 16-bit PCM audio in your browser. No upload — everything runs locally via WebAssembly.
libFLAC lossless encoding
The libFLAC encoder compresses the raw PCM using linear predictive coding at level 8. The FLAC output is a bit-perfect container of the decoded MP3 audio.
Download FLAC files
Your FLAC files are ready for DAW import, audio archives, or any workflow that requires a lossless audio format.
// under the hood
MP3 uses Modified Discrete Cosine Transform (MDCT) with Huffman coding for lossy perceptual compression. FLAC uses linear predictive coding (LPC) with Rice coding for lossless compression. Our converter uses FFmpeg WASM to decode the MP3 to raw 16-bit 44.1kHz PCM samples, then encodes with the libFLAC encoder at compression level 8 (maximum compression, identical decode quality to level 0). The resulting FLAC is a lossless container of the decoded MP3 audio.
//faq
Frequently Asked Questions
- What is FLAC format?
- FLAC (Free Lossless Audio Codec) is an open-source audio format that compresses audio without any quality loss. Unlike MP3 or AAC, FLAC stores every bit of the original audio data and decompresses to identical PCM output every time. It's the standard format for audiophile music libraries, professional DAW workflows, and high-resolution audio downloads from Bandcamp and Qobuz.
- Does converting MP3 to FLAC improve quality?
- No. MP3 is a lossy format that permanently removes audio data during encoding. Converting it to FLAC creates a lossless copy of the already-degraded MP3 audio — the FLAC will be larger but won't sound any better than the source MP3. Think of it as taking a 72 DPI JPEG and saving it as a lossless PNG; the file is bigger but the image isn't sharper.
- So why would I convert MP3 to FLAC?
- Consistency and workflow reasons. Some DAWs (Pro Tools, Logic Pro) and archival systems require FLAC input. Some streaming tools or batch processors in your pipeline only accept lossless formats. Converting MP3 to FLAC also prevents further generation loss — if you need to edit and re-export, FLAC won't add another lossy encoding stage.
- How much larger will the FLAC file be than the MP3?
- FLAC files are typically 3-5× larger than a 192kbps MP3. A 4-minute song at 192kbps MP3 (~5MB) will produce a FLAC file of roughly 15-25MB, depending on the audio complexity and the original sample rate. The FLAC compression level we use (level 8) maximises compression without affecting decode quality.
- Is my audio file private during conversion?
- Yes. All conversion runs locally in your browser via FFmpeg WebAssembly. Your MP3 files never leave your device — no server upload, no logging, no file access by anyone.
//related_converters
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