Free online audio converter

Convert Audio to OPUS Online

Create an Opus output when browser recording support is available. Opus is efficient for speech, web audio, voice notes, and compact audio delivery.

Upload audio file

Drop an audio file here, or choose a file from your device. The converter tries to decode the file locally in your browser.

Choose Audio File

MP3WAVWMAOGGM4R3GPPOPUSM4AAACAMRFLACAIFFAPE

Output format

About OPUS conversion

Opus is useful for speech, voice clips, web apps, and efficient audio where browser/app compatibility is acceptable.

Opus output is usually generated inside Ogg or WebM depending on browser support. The downloaded extension is set to match the selected tool.

The converter runs in your browser. It accepts common audio extensions such as MP3, WAV, WMA, OGG, M4R, 3GPP, OPUS, M4A, AAC, AMR, FLAC, AIFF, and APE, but actual decoding depends on browser support. Older formats such as WMA, AMR, 3GPP, APE, and exact AAC/MP4 outputs may require server-side conversion.

How to use

How to convert audio to OPUS

Upload your audio file. Choose an audio file from your device or drag it into the upload area.
Wait for local decoding. The browser reads the audio file and prepares it for conversion when the format is supported.
Create the OPUS output. The page is already set to OPUS, so you only need to click the create button.
Download manually. When the output is ready, click the download button yourself. The file does not auto-download.

Formats

Input and output format notes

These are the input extensions accepted by the upload field. Browser support is different from full codec support, so a file can be accepted by the picker but still fail if the browser cannot decode it.