Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Drop your .opus file
Choose MP3 bitrate (128 kbps is fine for voice)
Download the MP3
0 bytes uploaded. Opus to MP3 Converter runs entirely in your browser using FFmpeg.wasm 8.1, RNNoise, and the Web Audio API. Your audio stays on your device at all times. No data is sent to any server — critical for sensitive interviews and confidential calls.
Opus is the codec used for WhatsApp and Telegram voice notes. Many older players, transcription tools, and DAWs only accept MP3 — convert locally without exposing private messages.
Convert iTunes M4A and Apple Voice Memo files to universally-compatible MP3. Choose bitrate, preserve metadata.
Open toolConvert OGG Vorbis files to MP3 for wider device compatibility. Adjustable bitrate, no upload.
Open toolPull MP3 audio out of MP4, MOV, MKV, WebM, AVI files up to 2 GB. No upload — runs in your browser via FFmpeg 8.1 with multi-threaded WASM.
Open tool