Yes — for files under 100 MB and reasonable use. Pro covers big files and batch conversions.

Will the audio quality drop?

Depends on the format. Going from a lossy format (MP3, AAC, OGG, Opus) to a lossless one (WAV, FLAC) preserves the current quality. Going lossy-to-lossy or lossless-to-lossy uses high-quality VBR encoding.

Do I need to install anything?

No — it runs entirely in your browser plus AuTrans's engine.

Need a transcript of the audio?

AuTrans also transcribes audio in Nigerian English, Pidgin, Yoruba, Hausa, Igbo, French, and Spanish.

Audio Converter

Convert AAC to OPUS online

Drop any AAC file, get a OPUS download in seconds. Free, no signup for short files.

AuTrans converts your AAC file to OPUS in seconds using the same FFmpeg-backed engine that powers our African-language transcription product. Sound quality preserved, metadata respected, ready to listen to or share.

Convert AAC to OPUS now

Drop your AAC into the AuTrans Studio, pick OPUS as the output, and export. Free for files under 100 MB; Pro for bigger files and batch conversions.

Open in Studio

Frequently asked questions

Is it free?: Yes — for files under 100 MB and reasonable use. Pro covers big files and batch conversions.
Will the audio quality drop?: Depends on the format. Going from a lossy format (MP3, AAC, OGG, Opus) to a lossless one (WAV, FLAC) preserves the current quality. Going lossy-to-lossy or lossless-to-lossy uses high-quality VBR encoding.
Do I need to install anything?: No — it runs entirely in your browser plus AuTrans's engine.
Need a transcript of the audio?: AuTrans also transcribes audio in Nigerian English, Pidgin, Yoruba, Hausa, Igbo, French, and Spanish.

Start transcribing free

Get 30 minutes of free transcription every month. No credit card required. Just upload your audio and go.

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