WMA Won't Open? Convert to FSSD Instantly
Fast, instant WMA to FSSD conversion. No signup required. Just drop your .wma file and get .fssd in seconds.
Batch Settings
About WMA to FSSD Conversion
Dealing with a WMA file that won't open on your device? You're not alone — WMA compatibility issues are one of the most common reasons people search for a file converter. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections.
The fix is simple: convert your WMA to FSSD. FSSD is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting WMA to FSSD maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your WMA file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a FSSD file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert WMA to FSSD
- 1
Add your WMA file
Drag and drop your .wma file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick FSSD output
Select .fssd as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The audio engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .fssd file. For batch jobs, download all at once as a zip.
What Happens When You Convert WMA to FSSD
Your WMA file is decoded and re-encoded as FSSD.
Your WMA file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in FSSD format
The converted file is ready for download
Format Comparison
WMA
.wma file
| Extension | .wma |
| MIME Type | audio/x-ms-wma |
| Category | Audio |
FSSD
.fssd file
| Extension | .fssd |
| MIME Type | audio/x-fssd |
| Category | Audio |
Should You Convert WMA to FSSD?
When to Convert
- ✓When you need a FSSD file
Frequently Asked Questions
Why won't my WMA file open?
WMA files may not open if your device lacks the right codec or application. Converting to FSSD — a more widely supported format — usually resolves this. FSSD is a widely used file format.
Is it safe to convert WMA to FSSD online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting WMA to FSSD?
Converting WMA to FSSD maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my WMA file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert WMA to FSSD on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.