OPUS to M4A Converter
Convert OPUS to M4A online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
How it works
Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
Upload your file
Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.
Choose an output format
Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.
Convert & download
Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.
What is an OPUS file?
Opus is a modern, royalty-free lossy audio codec standardized by the IETF (RFC 6716). It combines the SILK codec (originally built for Skype) with the CELT codec to deliver high audio quality at very low bitrates and latency, scaling smoothly from low-bitrate speech to high-fidelity music. Its efficiency and low latency have made it the default codec for WebRTC, Discord, WhatsApp, and Microsoft Teams voice and video calls.
How to open an OPUS file
Opus files play natively in VLC Media Player, Firefox, and Chrome, and most modern operating systems include native decoder support. On older systems or media players without Opus support, the format can be converted to a more universally compatible format like MP3 or WAV.
OPUS Technical Info
- Full Name
- Opus Interactive Audio Codec
- Developed By
- Xiph.Org Foundation / IETF
- Initial Release
- 2012
- MIME Type
- audio/opus
What is an M4A file?
The M4A file extension denotes an audio-only MPEG-4 container, defined by ISO/IEC 14496-14 standards and typically encoded using Advanced Audio Coding (AAC) or Apple Lossless (ALAC). Originally popularized by Apple to differentiate audio content from standard .MP4 video files, the container utilizes an atom-based structure (e.g., ftyp, moov, mdat) to store audio streams and metadata. It serves as the successor to MP3, offering superior compression efficiency and fidelity at equivalent bitrates.
How to open an M4A file
M4A files are natively supported by the Apple ecosystem (iTunes, QuickTime, iOS Music) and Windows Media Player on modern Windows versions. Cross-platform compatibility is robust, with VLC Media Player, Audacity, and Winamp providing decoding capabilities. On Android devices, native players often handle M4A, though third-party apps like Poweramp ensure compatibility with ALAC-encoded variants.
M4A Technical Info
- Full Name
- MPEG-4 Audio
- Developed By
- Apple Inc. / MPEG
- Initial Release
- 2001
- MIME Type
- audio/mp4
More tools
Related conversions
Why RunConvert
The fastest way to convert any file
Purpose-built for speed, privacy, and breadth of format support.
Convert OPUS to M4A in seconds
Every OPUS to M4A conversion runs on our servers, so your device stays fast and the output quality stays intact.
Fast, cloud-powered
No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
Secure & private
Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
Free - no account needed
Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.
Developer API
Convert OPUS to M4A via API
Automate OPUS to M4A conversions in three steps: create a job, upload your file, then poll for the result.
# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"tag": "opus-to-m4a",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "m4a"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.opus
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
-H "Authorization: Bearer YOUR_API_KEY"Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.