Convert any audio file to Opus format online for free. Fast, secure, and easy-to-use audio to Opus converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your 3GP Audio file, or click to browse for it.
Choose Opus as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
Download your converted file instantly. The download link expires in 1 hour for security.
Our powerful servers process your files quickly, delivering converted files in seconds.
Convert your files completely free with no hidden costs or subscription fees.
Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
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How the two formats differ on the things that change your result.
| Specification | 3GP Audio (source) | Opus (result) |
|---|---|---|
| Container | 3GPP (audio-only) | Ogg |
| Developed by | 3GPP | Xiph.Org / IETF |
| Introduced | 2001 | 2012 |
| Audio codecs | AMR-NB, AMR-WB, AAC-LC | Opus |
| Compression | Lossy | Lossy |
| Typical bitrate | 8–64 kbps | 64–256 kbps |
| Max sample rate | 16 kHz | 48 kHz |
| Max channels | 2 | 255 |
| Gapless playback | No | Yes |
| Metadata / tags | 3GPP asset boxes | Vorbis comments |
| Approx. file size | 0.06–0.48 MB per minute | 0.48–1.44 MB per minute |
| Licensing | Patent-licensed | Royalty-free |
| Plays natively on | Native: Android · Needs a player: Windows, macOS, iOS | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS |
| Best for | voice recordings, phone recordings, low-bandwidth delivery | voice and calls, podcasts, web delivery |
This is a transcode, not a copy: AMR-NB is decoded and then re-encoded as Opus, and every re-encode costs a little quality. If the source was encoded at a low bitrate, encode the Opus file near 256 kbps so the second pass is not the bottleneck.
This conversion moves the file toward a different purpose: 3GP Audio suits voice recordings, phone recordings, low-bandwidth delivery, whereas Opus is chosen for voice and calls, podcasts, web delivery.
Tags do not transfer verbatim. 3GP Audio stores them as 3GPP asset boxes while Opus uses Vorbis comments, so titles and artwork are remapped and unusual custom fields may not survive.
Converting 3GP Audio to Opus means moving audio out of the 3GPP (audio-only) container, introduced in 2001, and into Ogg, which arrived in 2012. The two were designed with different priorities, and that is what determines whether this conversion costs you quality, storage, or compatibility.
Developed by 3GPP in 2001, 3GP Audio carries lossy-compressed audio (AMR-NB, AMR-WB, or AAC-LC). That sets the upper bound on what any conversion can preserve.
Opus was introduced by Xiph.Org / IETF in 2012. It holds lossy-compressed audio (Opus) and plays natively on web browsers and Android.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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