Convert Opus files into the M4A format that's at home on iPhones, in iTunes and many modern players. The conversion runs right in your browser with no upload.
In “Local” mode your file never leaves your device. No uploads, no server – ideal for sensitive recordings.
Pick “Local” for full privacy or “Server” for very large files and every format.
No sign-up, no queue, no watermark. Choose a file, convert, download.
Both formats are lossy, so this is a transcode with possible minor loss. A high bitrate keeps the difference inaudible.
Apple devices don't natively support Opus. M4A with AAC audio, by contrast, plays effortlessly on iPhone, iPad and in iTunes.
Yes. M4A is supported by most modern phones and players, though it's especially common in the Apple ecosystem.
No. By default everything runs locally in your browser. Only very large files can optionally use the server mode.