MP3 to FLAC Converter
Convert MP3 (MPEG-1 Audio Layer III) files to FLAC format for lossless archiving and preservation. Decode lossy MP3 to compressed lossless FLAC. Professional-quality audio conversion powered by FFmpeg, all processing happens securely in your browser.
Recommended Settings
For Archiving
- •Level 8 for maximum compression
- •No further quality loss
- •Open-source lossless format
For Everyday Use
- •Level 5 for balanced performance
- •Faster encoding/decoding
- •Cross-platform compatibility
Pro Tips
- •Converting lossy MP3 to FLAC doesn't improve quality
- •All compression levels preserve MP3 quality identically
- •FLAC prevents further quality loss from future conversions
Most Popular
Most users choose level 5-8 for archiving MP3 collections in FLAC
When to Use This Tool
Convert MP3 to FLAC for long-term archiving in a lossless format, preventing further quality degradation.
Recommended: Level 8
Store MP3 files in a modern, open-source lossless format with better compression than WAV or AIFF.
Recommended: Level 5-8
Convert MP3 to FLAC for compatibility with high-end audio players and audiophile systems that prefer lossless formats.
Recommended: Level 5
How It Works
Upload your MP3 audio file
Select compression level (0-8)
FFmpeg processes lossless FLAC encoding
Download your converted FLAC file
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by FFmpeg.wasm (WebAssembly) for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
What is FLAC format?
FLAC (Free Lossless Audio Codec) is an open-source lossless audio format that compresses audio without any quality loss. It's widely supported by audiophile equipment and offers better compression than WAV or AIFF.
Will converting MP3 to FLAC improve quality?
No. MP3 is a lossy format, so the quality is already reduced from the original. Converting to FLAC creates a lossless container but cannot restore lost quality. However, FLAC prevents further quality loss and is ideal for archiving in a modern format.
What compression level should I use?
Level 5 (default) offers balanced compression and speed. Level 8 provides maximum compression for archiving. Level 0 is fastest. All levels preserve identical audio quality - they only affect file size and encoding time.
Why convert lossy MP3 to lossless FLAC?
While it doesn't improve quality, converting to FLAC prevents further quality loss from future conversions, provides better archiving in an open format, and is compatible with high-end audio equipment that may not support MP3.
How much larger will FLAC files be?
FLAC files from MP3 sources will be larger since FLAC stores the decoded audio losslessly. A 5 MB MP3 may become 20-30 MB as FLAC. The benefit is no further quality loss and modern format compatibility.