Best Audacity Settings for Highest Quality FLAC Export

Exporting audio to FLAC (Free Lossless Audio Codec) in Audacity allows you to preserve the exact acoustic fidelity of your original recordings or mixes. Because FLAC is an inherently lossless format, the compression process itself never degrades audio quality. However, achieving the highest possible fidelity requires configuring your project sample rate, bit depth, dither, and export parameters correctly to prevent accidental downsampling, clipping, or truncation distortion.

1. Match the Project Sample Rate to Your Source

To avoid unwanted resampling artifacts, ensure your Project Sample Rate matches the original recording or imported files:

• Navigate to Audio Setup > Audio Settings (or look at the Project Rate (Hz) in older versions).
• Standard high-fidelity rates are 44,100 Hz (CD quality), 48,000 Hz (standard video/professional audio), or 96,000 Hz (high-resolution audio).
• Do not manually set a higher sample rate than your original audio; upsampling does not add missing detail and can introduce interpolation artifacts.

2. Configure Dither and Quality Settings

Audacity processes audio internally at 32-bit float. When exporting to fixed-point FLAC, correct dither settings prevent quantization distortion:

• Go to Edit > Preferences > Quality (or Audio Settings).
• Under High-quality Conversion, set Dither to Shaped (ideal for general listening) or Triangle.
• Set the Sample Rate Converter to Best Quality (Slowest) to ensure maximum precision whenever rate changes occur.

3. Select 24-bit Depth for Maximum Dynamic Range

FLAC natively supports 16-bit and 24-bit audio depths:

• 24-bit: Provides over 144 dB of dynamic range, capturing the full nuance of high-resolution recordings and multi-track mixes. Choose this for the absolute highest quality.
• 16-bit: The standard for CD audio (96 dB dynamic range). Use this only if you must maintain compatibility with legacy playback hardware.

4. Set the FLAC Compression Level

In the export dialog, Audacity provides a compression slider ranging from 0 to 8:

• Compression level does not affect audio quality. Because FLAC is mathematically lossless, the decompressed output bitstream is identical across all levels.
• Level 8 provides the smallest file size by using the most thorough compression algorithms. It takes slightly longer to encode, but playback CPU usage remains virtually the same.
• For the optimal balance of maximum storage efficiency and lossless preservation, set the slider to 8 (or leave it at the default 5).

5. Recommended Export Workflow

1. Click File > Export Audio.
2. Under Format, select FLAC Files.
3. Under Encoding / Bit Depth, select 24 bit.
4. Set the Level (Compression) slider to 8.
5. Ensure the channels match your mix (Stereo or Mono) and verify that the output sample rate matches your project rate.
6. Click Export to render the master file.