Convert WMA, AC3, AMR, CAF, MP2, and MKV audio files to WAV, MP3, OGG, or AAC. Powered by FFmpeg running in WebAssembly. All conversion happens in your browser with no uploads.
Certain audio formats require a full codec library to decode, including WMA from Windows Media Player, AC3 (Dolby Digital) from DVDs and broadcast, AMR voice recordings from Android devices, CAF from iOS and macOS apps, MP2 from broadcast television and radio, and audio tracks embedded in MKV video containers.
The Web Audio API built into browsers cannot decode these formats natively. This collection handles them by running FFmpeg entirely in your browser via WebAssembly. The WASM binary is loaded on demand from a CDN the first time you use a tool in this collection; subsequent conversions within the same session are immediate.
All conversion happens locally on your device. Your files are never uploaded to any server. The output formats (WAV, MP3, OGG, and AAC) cover the full range of use cases: WAV for editing in a DAW, MP3 for universal distribution, OGG for web and open-source platforms, and AAC for Apple devices and streaming services.
Step-by-step guidance and best practices for getting the most out of this collection
The formats in this collection require a codec library to decode because they use compression algorithms not built into browser audio APIs.
WMA (Windows Media Audio) was developed by Microsoft and is the default output format of Windows Media Player and Windows voice recorder. While largely superseded by MP3 and AAC, WMA files are still common in older Windows media libraries and some recording devices.
AC3, also known as Dolby Digital, is the primary audio codec for DVDs and was widely used in early Blu-ray releases and North American broadcast television. It supports multichannel audio up to 5.1 and is still found in broadcast recordings, video game audio, and ripped DVD content.
AMR (Adaptive Multi-Rate) is a speech codec optimized for low-bitrate voice transmission. It is the standard recording format for voice memos and call recordings on Android devices running older versions of Android. AMR-NB (Narrowband) operates at 4.75–12.2 kbps; AMR-WB (Wideband) provides higher quality for voice calls.
CAF (Core Audio Format) is Apple's flexible audio container used in iOS and macOS applications. Unlike MP3 or AAC, CAF is not a codec but a container that can hold any audio codec Apple supports, including PCM, AAC, ALAC, MP3, and more. CAF files from iOS voice memos and GarageBand are typically encoded as AAC or PCM inside the CAF container.
MP2 (MPEG-1 Audio Layer II) is the predecessor to MP3 and remains the standard audio codec for digital broadcast television (DVB) in Europe and professional broadcast radio in many regions. MP2 is rarely used for consumer audio distribution, which means modern media players often lack support for it.
MKV (Matroska Video) is a flexible multimedia container that can hold video, audio, and subtitle tracks. The audio track in an MKV file may be encoded in any codec, commonly AAC, AC3, MP3, or DTS. Converting the audio track extracts it and re-encodes it to your chosen format, discarding the video.
Convert Windows Media Audio files to standard formats
Convert Dolby Digital AC3 audio from DVDs and broadcast sources
Convert Android voice memos and call recordings from AMR format
Convert Apple Core Audio Format files from iOS and macOS
Convert MPEG-1 Audio Layer II files from broadcast and television sources
Extract and convert the audio track from Matroska MKV video files
Common ways professionals use these tools together
Upload your WMA file
WMA to MP3 Converter
Download the MP3, playable on any device or platform
WMA to MP3 Converter
Upload the MKV file to extract its audio track
MKV to WAV Converter
Edit or process the extracted WAV in an audio editor
Audio Trimmer / Audio Normalizer
Export the final audio to your target format
WAV to MP3 / WAV to AAC
Upload the AMR voice memo from your Android device
AMR to WAV Converter
Use the WAV file with transcription software or services
External transcription tool
Everything you need to know about ffmpeg audio converters
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