FLAC to SOU — Format Comparison & Online Converter
Fast, instant FLAC to SOU conversion. No signup required. Just drop your .flac file and get .sou in seconds.
Batch Settings
About FLAC to SOU Conversion
FLAC (introduced 2001) and SOU are both audio formats, but they differ in important ways. FLAC is lossless audio compression — bit-for-bit identical to the original at roughly 50-70% of WAV size. SOU is a widely used file format.
When you convert FLAC to SOU, the goal is to convert between formats quickly. Converting FLAC to SOU maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your FLAC file is decoded and re-encoded as SOU. The conversion involves 4 steps: (1) your flac file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in sou format, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you need a SOU file. For the opposite direction, CocoConvert also supports SOU to FLAC conversion.
How to Convert FLAC to SOU
- 1
Upload .flac file
Select your FLAC file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .sou
Set SOU as the output format. The converter uses optimal settings based on the FLAC→SOU conversion profile.
- 3
Convert
The server-side engine decodes your FLAC file and re-encodes it as SOU. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .sou file. Multiple output files can be downloaded together.
What Happens When You Convert FLAC to SOU
Your FLAC file is decoded and re-encoded as SOU.
Your FLAC file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SOU format
The converted file is ready for download
Format Comparison
FLAC
.flac file
| Extension | .flac |
| MIME Type | audio/flac |
| Category | Audio |
SOU
.sou file
| Extension | .sou |
| MIME Type | audio/x-sou |
| Category | Audio |
Should You Convert FLAC to SOU?
When to Convert
- ✓When you need a SOU file
Frequently Asked Questions
What is the difference between FLAC and SOU?
FLAC is lossless audio compression — bit-for-bit identical to the original at roughly 50-70% of WAV size. SOU is a widely used file format.
Does FLAC to SOU conversion affect quality?
Converting FLAC to SOU maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, FLAC or SOU?
FLAC uses lossless compression. SOU is widely supported. The better choice depends on whether you prioritize file size or quality.
How long does FLAC to SOU conversion take?
Most conversions finish in seconds. Larger files or complex audio content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is FLAC or SOU better for long-term storage?
FLAC is better for archival since it's lossless.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.