Convert AIFC to WMA — Free Online Tool
Convert AIFC audio files to WMA format using FFmpeg in your browser — no upload required. This tool re-encodes the PCM or compressed audio stored in AIFC (Apple's extended AIFF container) into Microsoft's WMA format using the wmav2 codec, making your audio compatible with Windows Media Player, Xbox, and other Microsoft ecosystem devices.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your AIFC file here
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Free — no uploads, no signups. Your files never leave your browser.
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
AIFC stores audio in Apple's big-endian container format, which may contain uncompressed PCM data (such as pcm_s16be or pcm_s24be) or compressed variants like A-law and mu-law. Because WMA is a proprietary lossy Microsoft codec and AIFC is an Apple-native format, there is no possibility of a simple stream copy — the audio must be fully decoded from its AIFC representation and then re-encoded from scratch using the wmav2 codec at the target bitrate. The wmav2 encoder applies perceptual audio compression, discarding audio information the ear is less likely to notice in order to achieve a compact file. The default output bitrate is 128k, which strikes a balance between file size and listening quality for typical stereo content. If the source AIFC contained high-resolution PCM (24-bit or 32-bit), some dynamic range will be lost in this conversion because WMA is inherently lossy.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, the open-source multimedia processing engine that performs the AIFC decode and WMA encode pipeline. In this tool, FFmpeg runs locally in your browser via WebAssembly (FFmpeg.wasm) — no server is involved. |
-i input.aifc
|
Specifies the input file — an AIFC audio file. FFmpeg reads the AIFC container, identifies the audio codec used (which may be pcm_s16be, pcm_s24be, pcm_alaw, or others), and fully decodes the audio stream into raw PCM before re-encoding it as WMA. |
-c:a wmav2
|
Sets the audio encoder to wmav2, the second-generation Windows Media Audio codec. This is the standard and preferred WMA codec, producing better quality than wmav1 at equivalent bitrates and supported by all modern Windows Media Player versions and WMA-compatible devices. |
-b:a 128k
|
Sets the target audio bitrate to 128 kilobits per second for the wmav2 encoder. This is a common default for stereo WMA files — sufficient for general listening quality. Raise this value (e.g., 256k or 320k) if the source AIFC contained high-resolution PCM audio and you want to minimize quality loss in the WMA output. |
output.wma
|
Defines the output filename with the .wma extension. FFmpeg uses this extension to confirm the ASF/WMA container format for the output file, which is required to wrap the wmav2-encoded audio stream in a format that Windows Media Player, Xbox, and other Microsoft-ecosystem software can recognize and play. |
Common Use Cases
- Sharing professionally-recorded AIFC audio files with Windows users who rely on Windows Media Player or the legacy Windows ecosystem, where WMA is a native format
- Preparing AIFC-sourced audio (common in Apple Logic Pro or GarageBand exports) for playback on Xbox consoles or Windows Media Center setups that expect WMA files
- Reducing the file size of large uncompressed AIFC recordings (such as PCM-encoded field recordings) for distribution or archiving without switching to MP3 or AAC
- Converting AIFC voiceover or narration files to WMA for integration into PowerPoint presentations or legacy Windows multimedia projects
- Transcoding Apple-originated audio assets to WMA for upload to older enterprise content management or e-learning platforms that specifically require WMA input
- Testing how a high-fidelity AIFC master sounds at various WMA bitrates before committing to a final deliverable bitrate for a Windows-targeted streaming platform
Frequently Asked Questions
Yes — this conversion always involves quality loss. AIFC can store fully lossless PCM audio (e.g., 24-bit pcm_s24be), but WMA (wmav2) is a lossy codec that permanently discards audio data during encoding. The degree of quality loss depends on the output bitrate: 128k is acceptable for casual listening, but audiophiles or professionals working with high-resolution AIFC masters should use 256k or 320k to minimize the perceptual difference. Once converted, the original fidelity cannot be recovered from the WMA file.
wmav2 is the second-generation Windows Media Audio codec and produces noticeably better audio quality than wmav1 at the same bitrate, especially at 128k and below. wmav1 is an older, less efficient codec included for compatibility with very early Windows Media Player versions (pre-WMP7). Unless you specifically need to target hardware or software too old to support wmav2, there is no reason to use wmav1 — wmav2 is the correct default for this conversion.
FFmpeg will attempt to copy compatible metadata fields from the AIFC source file into the WMA output container, which supports standard metadata tags. However, AIFC uses Apple's AIFF chunk-based metadata structure, and not all custom or non-standard tags may map cleanly to WMA's ASF-based metadata format. Standard fields like title, artist, and album are generally preserved, but it is worth verifying tags in your media player after conversion if metadata accuracy is important.
Replace the '128k' value in the '-b:a 128k' flag with your desired bitrate. For example, use '-b:a 256k' for higher quality or '-b:a 64k' for a smaller file. WMA supports bitrates from 64k up to 320k for typical stereo content. If your AIFC source is a high-quality 24-bit or 32-bit recording, using 192k or 256k will better preserve the audible detail during the lossy re-encoding process.
The command shown converts a single file, but on the desktop you can batch process using a shell loop. On Linux or macOS, run: for f in *.aifc; do ffmpeg -i "$f" -c:a wmav2 -b:a 128k "${f%.aifc}.wma"; done. On Windows Command Prompt, use: for %f in (*.aifc) do ffmpeg -i "%f" -c:a wmav2 -b:a 128k "%~nf.wma". The browser-based tool processes one file at a time, but the displayed FFmpeg command is designed to be reused locally for batch workflows.
WMA is a reasonable choice if your target audience is specifically on the Windows ecosystem or if a platform explicitly requires it. However, for general-purpose audio distribution, MP3 or AAC are more universally supported across all devices and operating systems. WMA's main advantages are tight integration with Windows Media Player, native Xbox support, and its optional DRM capabilities — if none of those matter for your use case, you may find MP3 or AAC more practical. If you are converting from a lossless AIFC master for archival, converting to WMA is a one-way lossy step, so keep the original AIFC file.
Technical Notes
AIFC (Audio Interchange File Format Compressed) is a big-endian Apple format that extends AIFF by supporting multiple audio codecs beyond plain PCM, including pcm_alaw, pcm_mulaw, and floating-point PCM variants (pcm_f32be, pcm_f64be). WMA uses Microsoft's Advanced Systems Format (ASF) as its container, which is fundamentally incompatible at the stream level with AIFC's IFF/AIFF chunk structure — meaning full decode-and-reencode is mandatory. The wmav2 codec uses a hybrid subband/transform encoding scheme and is broadly supported across Windows devices. One important limitation: WMA does not support multichannel audio beyond stereo in the standard wmav2 profile, so if your AIFC source contains more than two audio channels (e.g., a surround sound mix), channels beyond stereo may be downmixed or dropped — use FFmpeg's '-ac 2' flag explicitly if you want to force a clean stereo downmix. Additionally, AIFC files recorded at high sample rates (88.2 kHz, 96 kHz) will be resampled to a rate compatible with wmav2 during encoding, as WMA typically targets 44.1 kHz or 48 kHz output. The resulting WMA file will be significantly smaller than an uncompressed AIFC source, typically 5–10x smaller at 128k, which is the primary practical reason for this conversion.