Opus to AAC
Converts Opus files to AAC format — voice-over-IP, real-time communication, and streaming at very low bitrates with excellent quality to modern streaming services, YouTube, and devices where AAC is the native codec. All conversion happens locally in your browser with no file size limits.
Runs on FFmpeg
How to Use the Opus to AAC
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See allOpus to MP3
Convert OPUS audio files to MP3 format directly in your browser. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM. Private and free. from VoIP and streaming sources.
AAC to FLAC
Convert AAC audio files to FLAC format directly in your browser. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM. Private and free.
AAC to M4A
Convert AAC audio files to M4A format directly in your browser. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM. Private and free.
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Convert MP4/WebM to GIF animations. Videos up to 250MB. Videos never leave your device — compression and conversion run locally in your browser with FFmpeg WASM.
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Compress multiple videos with one shared CRF setting (18 high quality, 23 default, 28 smaller, 35 maximum) encoded libx264 medium preset with 128k AAC audio. Studios batch 20 daily uploads at CRF 28 — local FFmpeg WASM, 2 free batches a day.
Frequently Asked Questions
Why convert Opus to AAC?
Opus (Opus Interactive Audio Codec) uses lossy compressed encoding and is best for voice-over-IP, real-time communication, and streaming at very low bitrates with excellent quality. AAC (Advanced Audio Coding) uses lossy compressed encoding and excels at modern streaming services, YouTube, and devices where AAC is the native codec. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
How does AAC quality compare to Opus?
At the same bitrate, Opus is generally more efficient than AAC. At 256kbps, most listeners cannot tell the difference. For critical listening, keep your Opus originals.
When using Opus to AAC, will the file size increase?
AAC typically needs a slightly higher bitrate than Opus to achieve equivalent quality. A 128kbps Opus file might become a 160-192kbps AAC file of similar perceptual quality.
Does the conversion preserve metadata?
Standard metadata fields like title, artist, album, and track number transfer from Opus to AAC. Custom or non-standard tags may not survive the conversion.
Can I use the AAC output on iPhone?
Yes. AAC is Apple's preferred audio format. The converted file plays natively in Apple Music, GarageBand, and any iOS audio app without additional conversion.
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Last updated October 2026