Compress FLAC
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Supports: FLAC
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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Need help?How to Compress FLAC Audio Online
- Upload Your FLAC File — Click "Choose Files" or drag and drop your .flac audio. Batch compression is supported.
- Set Compression Level — Under "Compression level," adjust the slider from 1 to 12 (default 12). Higher values = smaller files but slower encoding. This does NOT affect audio quality — FLAC is always lossless.
- Additional Compression Options — Under "File Compression":
- File Size Percentage (default 80%): Target a percentage of the original size
- Specific file size: Target an exact output size (default 8 MB)
- Custom Bitrate: Enter a value in Kbps (default 64 Kbps)
- Set Audio Channel (Optional) — Keep original, force Mono, or force Stereo. Downmixing stereo to Mono roughly halves the file size.
- Set Sample Rate (Optional) — Keep original or choose 8000–48000 Hz. Reducing from 96 kHz to 44100 Hz significantly reduces file size.
- Trim (Optional) — Set a start time and duration to keep only a segment.
- Compress and Download — Click "Compress" and download your smaller FLAC file. No sign-up required.
Why Compress FLAC Files?
- File Size Percentage (default 80%): Target a percentage of the original size
- Specific file size: Target an exact output size (default 8 MB)
- Custom Bitrate: Enter a value in Kbps (default 64 Kbps)
FLAC is a lossless audio format — a typical 5-minute track at 16-bit/44.1 kHz/stereo is 15–44 MB (400–1200 kbps). The compression level slider (1–12) controls how aggressively the lossless algorithm packs the data. Level 12 produces the smallest file but takes longer to encode. Level 1 is fastest but produces larger files. Neither affects audio quality.
For further size reduction beyond what lossless compression can achieve, you can downmix to Mono, reduce the sample rate, or trim unnecessary silence.
Frequently Asked Questions
Does the compression level affect audio quality?
No. FLAC compression is always lossless — every bit of audio data is preserved. The level only affects encoding speed vs file size.
How much can I reduce FLAC file size?
The compression level alone typically achieves a 1.2–3.5× compression ratio. Downmixing to Mono or reducing sample rate can further halve the size.
Can I batch compress?
Yes. Upload multiple FLAC files and download results individually or as a ZIP archive.