Why can't this tool convert AAC to WMA directly in the browser?

WMA is a proprietary codec owned by Microsoft. Encoding WMA audio requires licensed native libraries (such as the Windows Media Format SDK or a compatible FFmpeg build with the ASF muxer). Browsers cannot access these libraries through standard Web APIs, so true WMA encoding must happen in a desktop application or a server-side tool.

What is the difference between AAC and WMA?

AAC (Advanced Audio Coding) is an open standard widely supported on all platforms and devices, including iOS, Android, and streaming services. WMA (Windows Media Audio) is a Microsoft proprietary format primarily used in the Windows and Xbox ecosystem. Both offer similar quality at comparable bitrates, but AAC has broader hardware and software support.

Will converting AAC to WMA improve audio quality?

No. AAC is a lossy format, so audio data already discarded during AAC encoding cannot be recovered by re-encoding to WMA. The output will be similar to or slightly worse than the source AAC file. For quality archiving, start from a lossless source such as FLAC or WAV.

What is the fastest free way to convert AAC to WMA on Windows?

VLC Media Player (free, open-source) handles AAC-to-WMA conversion natively via Media > Convert/Save. Alternatively, use FFmpeg from the command line: ffmpeg -i input.aac -c:a wmav2 -b:a 128k output.wma.

Can I convert AAC to WMA on macOS or Linux?

Yes. Install FFmpeg via Homebrew on macOS or via your package manager on Linux, then run: ffmpeg -i input.aac -c:a wmav2 -b:a 128k output.wma. VLC for macOS also supports WMA conversion through its Convert/Stream dialog.

Is my file safe? Is it uploaded anywhere?

Your file is never uploaded. The browser's Web Audio API reads the file entirely from local memory to display metadata and enable playback. No data is transmitted to any server.

AAC to WMA Audio Converter

Name: AAC to WMA Audio Converter
Availability: InStock
Author: Nham Vu

Drop an AAC file to inspect its metadata and preview playback, then use the step-by-step guide to convert it to WMA on Windows, macOS, or the command line.

Inspect Your AAC File

Drop AAC / M4A here or click to browse Supports .aac and .m4a files

Why WMA Conversion Requires a Desktop Tool

WMA (Windows Media Audio) is a proprietary Microsoft codec. Encoding WMA audio requires licensed native libraries that browsers cannot access through standard Web APIs. This tool lets you inspect your AAC or M4A file metadata and preview playback, then follow the platform guide below to convert using a free desktop application.

AAC vs. WMA — Format Comparison

Feature	AAC	WMA
License	Open standard (ISO/IEC)	Proprietary (Microsoft)
Typical Bitrate	96–320 kbps	64–320 kbps
Quality at Low Bitrate	Better than MP3	Good–Better
Container	.aac / .m4a / .mp4	.wma / .asf
Browser Playback	Universal	Limited (Edge only)
Lossless Variant	No (ALAC is separate)	Yes (WMA Lossless)
Best Use Case	Streaming, iOS, Android	Windows / Xbox ecosystems

How to Convert AAC to WMA

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