MP3 to FLAC Converter
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Supports: MP3
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Need help?How to Convert MP3 to FLAC
- Upload Your MP3 File — Click "Choose Files" or drag and drop your MP3 audio file. Only .mp3 files are accepted.
- Adjust Compression Level (Optional) — Under Compression Level, set a value from 1 (fastest, largest file) to 12 (slowest, smallest file). Default is 12 (maximum compression).
- Adjust Audio Settings (Optional) — Under Audio Codec, the default is FLAC. Set Audio Channel to Original, Mono, or Stereo. Change Audio Sample Rate from 8000 Hz through 48000 Hz.
- Trim (Optional) — Under Trim, set a Start Time and Duration in seconds or HH:MM:SS.sss format.
- Convert & Download — Click "Convert" and download your FLAC file.
Why Convert MP3 to FLAC?
FLAC (Free Lossless Audio Codec) is an open-source lossless audio format. Converting MP3 to FLAC wraps the audio in a lossless container, which is useful for unifying a mixed music library into a single lossless format, preventing further quality degradation from additional lossy re-encoding, storing audio in a format that supports high-resolution metadata and tags, and ensuring compatibility with audiophile players and DACs that prefer FLAC input.
Important: Converting MP3 (lossy) to FLAC (lossless) does not restore audio data lost during MP3 compression. The FLAC file preserves the MP3's current quality without any further loss.
MP3 vs FLAC Comparison
| Feature | MP3 | FLAC |
|---|---|---|
| Compression | Lossy | Lossless |
| Quality loss on re-save | Yes (each encode degrades) | No (lossless) |
| File size (1 min, stereo) | ~1 MB at 128 kbps | ~3-5 MB |
| Metadata | ID3 tags | Vorbis comments (richer) |
| License | Patented (expired 2017) | Open-source, royalty-free |
| Player support | Universal | Most modern players |
| Best for | Sharing, streaming | Archival, audiophile playback |
FLAC Compression Level Guide
| Level | Speed | File Size | Best For |
|---|---|---|---|
| 1 | Fastest | Largest | Quick processing |
| 5 | Balanced | Medium | General use |
| 8 | Slow | Smaller | Storage efficiency |
| 12 (default) | Slowest | Smallest | Maximum compression |
Why is the File Compression section not available?
FLAC is a lossless format — bitrate-based compression methods (Quality Preset, Constant Bitrate, etc.) are hidden because they don't apply to lossless encoding. Instead, use the Compression Level setting (1-12) which controls how aggressively the lossless algorithm compresses. All levels produce identical audio quality.
Will converting MP3 to FLAC improve sound quality?
No. MP3 is lossy — audio data discarded during MP3 encoding cannot be recovered. The FLAC file will sound identical to the MP3 source. The benefit is that the FLAC version won't lose any additional quality if re-encoded or edited.
Why is the FLAC file larger than the MP3?
FLAC stores audio losslessly, so it preserves every sample from the MP3 decode. A 128 kbps MP3 (~1 MB/min) becomes roughly 3-5 MB/min as FLAC. The file is larger because FLAC doesn't discard any audio data.
Can I trim the audio during conversion?
Yes. Under Trim, switch to "Trim" and enter a Start Time and Duration. This extracts a specific segment.
What is the difference between Compression Level 1 and 12?
Both produce identical audio quality (lossless). Level 1 encodes faster but produces a larger file. Level 12 (default) takes longer but produces the smallest possible FLAC file. The difference is typically 5-15% in file size.