Convert WMV to MP3 Online
Extract audio from Windows WMV videos. Free, in your browser, no file uploads.
.wmv · up to 100 MB
What you can do
Extract audio from legacy Windows presentations and videos
PowerPoint and Movie Maker
Extract narration from presentations with embedded WMV video or Windows Movie Maker exports.
100% private
Your corporate WMV files never leave your device. Conversion is local.
WMA to MP3
WMA (Windows Media Audio) from the ASF container is converted to universal MP3.
Lync and Skype recordings
Compatible with Skype for Business and Microsoft Lync meeting recordings saved as WMV.
How it works
Three steps, no hassle
Upload your WMV file
Drag or select the .wmv from Windows Movie Maker, PowerPoint, or Windows Media Player. No signup, no installs.
Audio extraction in the browser
The WMA audio from the WMV file is extracted and converted to MP3 directly on your device.
Download your MP3
Audio ready to play on any device, extract voice from presentations, or archive corporate meetings.
FAQ
Got questions?
WMV (Windows Media Video) is Microsoft's proprietary video codec introduced in 1999 as part of the Windows Media framework. WMV files use the ASF (Advanced Systems Format) container, the same container used by WMA (Windows Media Audio) for audio-only files. WMV was the dominant video format in the Windows ecosystem during the 2000s: Windows Movie Maker (included in Windows XP from 2001) exported to WMV by default, Windows Media Player was the default player, and early Microsoft Office versions embedded PowerPoint video in WMV format.
Microsoft PowerPoint up to the 2007 version embedded or linked videos in WMV format in presentations. If you have old corporate presentations with voice narration, product demos, or tutorials in WMV, extracting the audio to MP3 lets you: transcribe the narration, reuse it in other formats, archive it independently of the presentation file, or edit only the audio without processing the full video. It's also common for Skype for Business and Lync meeting recordings saved as WMV.
Yes. WMA (Windows Media Audio) in standard variants (WMA v1, WMA v2, WMA 9) is decodable by modern browsers via Web Audio API on Windows (where Edge and Chrome have access to the OS's WMA decoders). For files with WMA Pro (multichannel) or WMA Lossless, compatibility depends on the browser and OS. If the WMV file has an MP3 audio track instead of WMA, extraction is straightforward on any system.
Yes. Windows Movie Maker (XP, Vista, and 7 versions) exported projects to WMV with WMA stereo audio at 44.1 kHz or 48 kHz. Extracting audio from those final exported WMV files works perfectly. Movie Maker project files (.mswmm, .wlmp) are not videos and are not directly compatible; you need the final exported WMV file.
No. WMV files protected with DRM (Microsoft's Digital Rights Management, known as Windows Media DRM or PlaysForSure) have encrypted audio that cannot be extracted without the corresponding license. These files show a lock icon in Windows Media Player. DRM-free WMVs (your own creations, screen recordings, PowerPoint exports) are fully compatible.
Yes. Conversion happens entirely in your browser. WMV files from presentations, meeting recordings, or corporate material are never transmitted to any server. This is especially relevant for NDA-protected material or sensitive company data.
Convert WMV to MP3: extract audio from Windows videos and presentations
WMV (Windows Media Video) and WMA (Windows Media Audio) are part of the Windows Media framework that Microsoft developed between 1999 and 2003 as a competitive response to RealNetworks RealMedia and Apple QuickTime. The underlying container for both formats is ASF (Advanced Systems Format), a container designed by Microsoft for media streaming over low-speed networks (dial-up, ISDN) but also used for local files. WMV version 1 was released in 1999 as part of Windows Media Player 6.4 and Windows Media Technologies 4.0. Later versions (WMV 7, WMV 8, WMV 9) progressively improved compression efficiency to the point that WMV 9 was proposed by Microsoft to SMPTE as a high-definition video standard, being adopted as VC-1 (SMPTE 421M) in 2006 and used as one of the three mandatory video codecs in the Blu-ray standard. In Microsoft's productivity context, WMV had massive presence through Windows Movie Maker (XP, Vista, 7), which exported to WMV by default, and PowerPoint 2000–2007, which used WMV for embedding video in presentations. Millions of corporate presentations, training tutorials, and product demos created between 2001 and 2010 contain WMV video with WMA voice narration.
The practical need to extract audio from WMV files in 2025 arises primarily from three scenarios. The first is corporate narration recovery: old PowerPoint presentations (2000–2010) containing WMV videos with recorded narration, product demos, or employee training tutorials. When these presentations are migrated to modern formats (PPTX, Google Slides) the WMV video is often incompatible, but the voice narration remains valuable for reuse in new materials. The second scenario is meeting transcription: Microsoft Lync (2010–2015, Teams predecessor) and Skype for Business (2015–2021) saved meeting recordings in WMV format. Many organizations retain hundreds of meeting recordings from that era in WMV. Extracting the audio to MP3 is the first step to transcribing them with modern speech recognition tools like OpenAI's Whisper or Azure Speech Services. The third scenario is digital archiving of audiovisual material produced with Windows Movie Maker, the free video editing tool included in Windows XP and Vista that introduced millions of non-technical users to video creation.
Technically, extracting audio from WMV to MP3 requires working with the ASF (Advanced Systems Format) container, whose specification Microsoft published through the MCPP (Microsoft's Open Specification Promise) in 2008. The ASF container organizes data into header objects and data objects; the header object contains descriptors for the audio and video streams (codecs, resolution, sample rate, channels), while data objects contain interleaved media packets. To extract the audio, it is necessary to parse the ASF objects, identify the PID of the audio stream (typically WMA encoded at 128–192 kbps, stereo, 44.1 kHz), and transcode it to MP3. The particularity of WMA is that, unlike open-source audio codecs, WMA decoding depends on Microsoft's proprietary licenses, which has historically complicated its support in cross-platform software. Modern browsers on Windows (Chrome, Edge) have access to the OS's WMA decoders through Media Source Extensions, allowing Convertir.ai to process WMV files in the browser without installing additional codecs.