WMV to AAC Converter

How to Convert WMV to AAC Online

1. Upload Your WMV File: Drag and drop, or click "+ Add Files" to select one or more .wmv videos from your device. Batch conversion is supported — all queued files convert with the same settings.
2. Pick Quality Preset or Custom Bitrate: Default is "Highest". Drop to High or Medium for smaller files, or switch to Custom Bitrate and pick a Constant Bitrate (CBR) value (64-320 kbps) or Variable Bitrate (VBR) range. 128 kbps stereo VBR is the ITU "transparent" target for AAC; 192-256 kbps is the practical ceiling where bigger numbers stop being audible.
3. Set Channels, Sample Rate, or Trim (Optional): Audio Channel defaults to Original — force Mono to halve the file for voice content, or Stereo to mix down 5.1 surround. Audio Sample Rate defaults to Original (typically 44.1 or 48 kHz from the source); 48 kHz is the broadcast standard. Use Trim to cut the AAC down to a specific start/duration without re-encoding the whole timeline.
4. Convert and Download: Click Convert. Files process in your browser session — no sign-up, no watermark, no email gate. Output is a raw .aac stream ready for playback or import into a DAW.

Why Convert WMV to AAC?

WMV (Windows Media Video) is Microsoft's legacy container, introduced in 1999 and almost always paired with WMA audio inside an ASF wrapper. WMA is a Microsoft-only codec with thin support outside Windows — Android requires third-party players, iOS rejects it entirely, and Firefox does not ship a WMA decoder. AAC (Advanced Audio Coding), standardized in 1997 as ISO/IEC 13818-7 (MPEG-2 Part 7) and extended in ISO/IEC 14496-3 (MPEG-4 Part 3), is the audio codec every modern device decodes natively. Extracting the audio track from a WMV and re-encoding it as AAC is how you turn a Windows-only archive into a clip you can drop into iMovie, Logic, Premiere, or a podcast feed.

• iOS, Apple Music, and the iTunes Store — Apple's ecosystem is AAC-native. Drop the .aac into the Music app or sync to an iPhone and it plays without conversion; the same WMV would need a third-party app and almost always fails on the audio track.
• YouTube, PlayStation, Nintendo — all three platforms list AAC as a supported audio codec for uploads and playback. Submitting WMA audio to YouTube Studio routes you through the transcoder anyway, so it's faster to do the AAC conversion locally and upload a clean stream.
• Salvaging old lecture recordings and screencasts — WMV was the default Windows Movie Maker and Camtasia output through the 2000s. Pulling the audio out as AAC lets you cut a 90-minute lecture into searchable podcast episodes, or feed it into a transcription service that expects MP4/M4A/AAC inputs.
• Cross-browser web embeds — Chrome, Edge, and Safari (since v4) all support AAC in <audio> elements; Firefox has partial AAC support since v22 (it depends on the OS decoder). WMA in <audio> is not supported by any major browser.
• DAW import for re-mixing or scoring — Logic, Ableton Live, Reaper, and Pro Tools all import AAC directly; most reject WMV/WMA without an extra ffmpeg step. AAC is the lowest-friction handoff from "old video" to "audio editor".
• Smaller files than uncompressed alternatives — AAC at 128 kbps stereo is typically 3-5× smaller than the same content at 16-bit PCM WAV, while staying perceptually transparent for music and dialogue.

WMV (audio track) vs AAC — Format Comparison

AAC Bitrate Quick Guide

Frequently Asked Questions

Why convert WMV to AAC instead of MP3?

AAC achieves higher sound quality than MP3 at the same bitrate — it uses a pure MDCT transform versus MP3's hybrid filterbank, which means cleaner reproduction of cymbals, sibilants, and transients. AAC is also the default audio codec for iOS, Apple Music, YouTube, and PlayStation, so it travels through modern ecosystems without re-encoding. MP3 is still useful if your target device is from before 2005; otherwise AAC is the better default. If you specifically need MP3, use WMV to MP3 instead.

What's the difference between a .aac file and an .m4a file?

Both contain AAC-encoded audio, but .m4a wraps the AAC stream in an MP4 container, which adds chapter markers, album art, gapless playback metadata, and lyric tags. Raw .aac is just the elementary stream — smaller, faster to mux, but no metadata. For Apple Music, audiobooks, or anything you want tagged, use WMV to M4A. For ringtones, voice memos, or streaming pipelines that want the bare codec, stick with .aac.

Will the audio quality drop when converting from WMV to AAC?

Yes — any conversion between two lossy codecs (WMA inside WMV → AAC) causes some generational loss because each codec discards different perceptual data. At 192-256 kbps AAC the loss is inaudible in casual listening. If your source WMV was encoded at high bitrate (192 kbps WMA+) and you target 192-256 kbps AAC VBR, the result is effectively transparent. Avoid encoding to 64 kbps AAC if the source was already a tightly compressed WMA — the artifacts compound.

How big will my AAC file be compared to the WMV?

The AAC file will typically be 5-50× smaller because you're dropping the video track entirely and keeping only the audio. A 90-minute 720p WMV at 2 Mbps might be ~1.3 GB; the same audio at 192 kbps stereo AAC is roughly 130 MB. If you're targeting a podcast feed (typically 96-128 kbps mono/stereo), expect 60-90 MB per hour of speech.

Does AAC play on Windows Media Player and Windows in general?

Yes. Windows 10 and 11 ship with AAC decoding built into Media Foundation, so Windows Media Player, Movies & TV, Films & TV, and any Microsoft Store player handle .aac natively. The reverse is the hard direction: WMA doesn't play on Apple devices without extra software. Converting toward AAC is the safe bet for cross-platform sharing.

Can I extract just one chapter or a specific time range from a long WMV?

Yes. In the Trim section, set a start time and duration in hours:minutes:seconds.milliseconds, and only that range will be encoded into the output AAC. This is much faster than converting the whole timeline and re-trimming in a DAW, and the seek is sample-accurate. For more advanced cutting (multiple cuts, fade in/out), convert the full file first and then use Audio Cutter or Trim AAC.

Does this work with DRM-protected WMV files (e.g., old PlayReady downloads)?

No. WMV files protected with Windows Media DRM or PlayReady cannot be decoded by any browser-based or third-party converter — Microsoft's DRM is enforced at the codec level. If your file came from a legitimate purchase, the source platform (Movies & TV, Xbox) is the only legal way to play it. Unprotected WMV files (most lecture recordings, screen captures, family videos, and ASF camera output) convert without issue.

My WMV has 5.1 surround audio. What happens when I convert?

The conversion downmixes 5.1 (or 7.1) to stereo by default, using the standard ITU-R BS.775 downmix coefficients (front L/R + 0.707·center + 0.707·surround). If you need to preserve discrete surround channels, AAC supports multichannel — but raw .aac players almost always assume stereo, so the practical move is to keep the downmix or convert to WMV to AC3 instead, since AC3 is the home-theater surround default.

Why is my converted AAC silent or shorter than expected?

Two common causes. First, the source WMV may use a Sipro ACELP audio track (a deprecated codec used in a tiny fraction of early-2000s WMVs) — these often fail to decode cleanly; try WMV to WAV which forces full PCM decode before re-encoding. Second, the file may have variable-frame-rate audio that misreports its duration; check the file in VLC's "Codec Information" to confirm the real length, then re-run the conversion with explicit Trim values.