CONVERT M4A → WMA (M4A to WMA)
Fast, secure M4A to WMA conversion. No registration required.
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HOW TO CONVERT M4A → WMA
Provide the audio file
Drag the M4A onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
ffmpeg handles the conversion
Our ffmpeg-based pipeline reads sample rate and channel layout, then writes a matching WMA with ID3 tags intact.
Save the output
Click to download the WMA. Batch uploads are bundled into a ZIP for single-click retrieval.
M4A is a container holding AAC-encoded audio, almost always produced by Apple's ecosystem — iTunes purchases, GarageBand exports, iPhone voice memos, and ripped CDs via Music.app. WMA (Windows Media Audio) is Microsoft's proprietary codec packaged in the ASF container, still required by a narrow but persistent slice of hardware and software: older Windows Media Player embedded systems, certain Sonos-era network streamers, some automotive head units that predate Bluetooth Audio profiles, and corporate multimedia authoring tools tied to Windows workflows. The conversion is a transcode between two perceptual codecs — AAC to WMA Standard — meaning both stages apply psychoacoustic lossy compression, so you are decoding compressed audio and re-encoding it into a different compression scheme. Bit depth stays at 16-bit PCM in the intermediate decode step before WMA re-encodes at whatever target bitrate you select. Sample rate is typically preserved at 44.1 kHz for music-origin files or 48 kHz for video-sync sources, though WMA Standard supports both without resampling. The result is a .wma file readable by Windows Media Player 9 and later, by VLC on any platform, and by the embedded Windows Media playback engine present in every version of Windows from XP onward.
Why convert M4A to WMA
The single concrete reason users perform this conversion is Windows Media Player or a downstream system that refuses AAC. WMP on Windows 7 and earlier has no native AAC decoder unless a third-party codec pack is installed, so M4A files either fail to open or play silently. Corporate environments locked to unpatched Windows images hit this routinely. A smaller group of users targets portable devices — older Archos players, certain Fiio DAPs from the 2012–2016 era, and some vehicle infotainment units — that enumerate WMA support in their spec sheet but were shipped before AAC became a baseline expectation. Windows Movie Maker and the legacy Microsoft Expression Encoder also accept WMA but not M4A natively, which creates a workflow dependency when assembling multimedia projects on older Windows machines.
M4A vs WMA — Technical specifications
Side-by-side comparison of the technical details.
M4A
- MIME type
- audio/mp4
- Extension
- .m4a (and .m4b for audiobooks, .m4p for legacy DRM)
- Container
- ISO Base Media File Format (ISOBMFF)
- Codecs
- AAC-LC, HE-AAC, ALAC
- Max sample rate
- 96 kHz
- MIME Type
- audio/mp4
- Category
- Audio Files
- Full Name
- M4A Audio
- Conversion Engine
- FFMPEG
WMA
- MIME type
- audio/x-ms-wma
- Extension
- .wma
- Container
- ASF (Advanced Systems Format)
- MIME Type
- audio/x-ms-wma
- Category
- Audio Files
- Full Name
- Windows Media Audio
- Conversion Engine
- FFMPEG
- Variants
- WMA Standard, WMA Pro, WMA Lossless, WMA Voice
- Max bitrate
- 768 kbps (WMA Pro)
| Specification | M4A | WMA |
|---|---|---|
| MIME type | audio/mp4 | audio/x-ms-wma |
| Extension | .m4a (and .m4b for audiobooks, .m4p for legacy DRM) | .wma |
| Container | ISO Base Media File Format (ISOBMFF) | ASF (Advanced Systems Format) |
| Codecs | AAC-LC, HE-AAC, ALAC | — |
| Max sample rate | 96 kHz | — |
| MIME Type | audio/mp4 | audio/x-ms-wma |
| Category | Audio Files | Audio Files |
| Full Name | M4A Audio | Windows Media Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| Variants | — | WMA Standard, WMA Pro, WMA Lossless, WMA Voice |
| Max bitrate | — | 768 kbps (WMA Pro) |
M4A vs WMA — Strengths and limitations
What each format does best, and where it falls short.
M4A Strengths
- Superior audio quality to MP3 at the same bitrate (AAC codec).
- Native support across Apple, iOS, Android, and Windows.
- Carries rich metadata: album art, chapters, lyrics, podcast bookmarks.
- Same container as MP4 — tooling overlaps with video workflows.
- Lossless variant (ALAC inside M4A) for audiophile archiving.
Limitations
- AAC patents still active in some jurisdictions — licensing fees apply for encoders.
- Seeking in variable-bitrate M4As can drift without an index atom.
- Less universal than MP3 on older hardware (pre-2010 car stereos, cheap MP3 players).
WMA Strengths
- Good quality at low bitrates (32-64 kbps) — outperformed MP3 in that range.
- Native playback on every Windows version 2000 through 10.
- Lossless variant available (WMA Lossless) for archiving.
- Supports multichannel 5.1 surround audio.
Limitations
- Proprietary — poor support outside Windows and Windows Media Player.
- DRM variants made files brittle — many purchased tracks became unplayable when stores shut down.
- Ecosystem abandoned — no modern editors, hardware decoders, or streaming services use WMA.
Quality & Compatibility
Both AAC and WMA Standard use transform coding with perceptual masking, so re-encoding compounds the generational loss from both codecs. At matched bitrates — say, 128 kbps source AAC decoded and re-encoded to 128 kbps WMA — listeners with trained ears will detect a subtle softening of transients and a slightly different artifact character in the upper midrange, because WMA's psychoacoustic model weighs frequency masking differently from AAC's. No metadata schema is fully equivalent: AAC stores tags in iTunes-style MP4 atoms (artist, album, track, artwork embedded as JPEG or PNG), while WMA uses ASF Content Description Objects and Extended Content Description Objects. Common tags such as title, artist, album, and genre survive the conversion when the encoder populates ASF fields from the decoded M4A atoms, but embedded cover art handling varies by tool and is not guaranteed. Gapless playback markers present in the M4A iTunSMPB atom have no WMA equivalent and are discarded.
Tips for Best Results
- Set the WMA output bitrate equal to or higher than the source M4A bitrate — dropping bitrate during a transcode between lossy codecs produces double-compressed audio with noticeably degraded clarity, particularly on vocals and acoustic instruments above 8 kHz.
- If your target device accepts WMA Pro or WMA Lossless, prefer those variants over WMA Standard: WMA Pro at 96 kbps measurably outperforms WMA Standard at the same bitrate for high-frequency content, and WMA Lossless eliminates the second compression step entirely at the cost of larger files.
- Before converting a batch of iTunes-purchased M4A files, confirm they are DRM-free — files bought before 2009 may be FairPlay-protected M4P files disguised with an .m4a extension, and any encoder will fail or produce silence on the audio track because the decryption key is tied to your Apple ID, not accessible to a third-party converter.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for WMA and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the M4A container to the WMA container automatically where both formats support them. If a tag field has no WMA equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
M4A Audio
Source formatM4A is an MPEG-4 audio container typically containing AAC or ALAC encoded audio. It is the standard format for iTunes purchases and Apple Music downloads.
Windows Media Audio
Target formatWMA is a proprietary Microsoft audio format from the Windows Media framework. Once common in the Windows ecosystem, it has been largely replaced by AAC and MP3 for general use.
Going the other way? Convert WMA back to M4A with the same engine.
Common Use Cases
Share across platforms
Send WMA files to anyone without worrying about whether they have the right software for M4A.
Embed in documents
Drop WMA output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
WMA often produces smaller files than M4A for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
M4A vs WMA — Typical file sizes
Approximate file sizes for common scenarios.
- 4-minute song (AAC 128 kbps) 4-5 MB
- 4-minute song (AAC 256 kbps) 8-10 MB
- 1-hour podcast (64 kbps) 28 MB
- 3-min song (128 kbps) 3 MB
- 3-min song (Lossless) 25-35 MB
- 1-hour talk (64 kbps) 28 MB
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Lossless batch chain processing preserving full ID3v2 metadata tags and embedded artwork.
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Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
M4A Format: MPEG-4 Audio — Apple Lossless, AAC & iTunes Explained
Learn what M4A files are, the difference between AAC and ALAC inside M4A, why Apple uses M4A instead of MP3, and how to convert M4A to MP3, FLAC, or WAV.
Read guide →M4A Files: MPEG-4 Audio Container — AAC, ALAC, and Conversion Guide
Complete guide to M4A files — AAC-LC vs ALAC content, quality comparison with MP3, gapless playback, FFmpeg conversion to MP3/FLAC/WAV/Opus, metadata...
Read guide →WMA Files: Windows Media Audio Format, Variants, DRM, and Conversion
Complete guide to WMA (Windows Media Audio) files — Standard/Pro/Lossless/Voice variants, DRM issues, player compatibility, FFmpeg conversion to...
Read guide →
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