Free online 3PG to OPUS converter

A 3PG recording may need conversion when a player, messaging application, or VoIP workflow accepts Opus but cannot read the original mobile-media file. Converting it extracts the audio and re-encodes it as an .opus file.

What the 3PG format is

.3pg is an uncommon filename extension for audio files associated with 3GPP mobile-media containers; many such files are actually named .3gp. The container can hold speech or other audio encoded with AMR-NB, AMR-WB, AAC, or related codecs, depending on the phone or recorder that created it.

Older mobile phones, multimedia messaging systems, and phone-recording applications are the main places you may encounter this extension. Because the extension is uncommon, inspect the file with a media tool before converting it; a file renamed incorrectly from another format may not be readable as 3GPP media.

What the OPUS format is

Opus is a lossy audio codec normally stored in an .opus file. It supports speech and music, handles low latency well, and provides good quality at relatively low bitrates, which makes it common in browsers, voice applications, games, and modern communication software.

Choose Opus when the destination application supports it and you want a smaller file than uncompressed PCM or many older codecs. It is not suitable when the recipient requires the original codec, broadcast WAV, or lossless audio.

How to actually convert 3PG to OPUS

Using FFmpeg

1. Install FFmpeg from a trusted desktop package for your operating system.
2. Open a terminal in the folder containing input.3pg. If the file is actually named input.3gp, use that exact filename.
3. Run:

ffmpeg -i input.3pg -map 0:a:0 -c:a libopus -b:a 64k output.opus

The -map 0:a:0 option selects the first audio stream and prevents an attached video stream from being copied. Use -b:a 32k to 48k for speech, -b:a 64k to 96k for general audio, or -b:a 96k to 128k for music. If FFmpeg reports that the input is invalid, verify the extension and inspect the file with:

ffprobe input.3pg

Using the website converter

You can convert the file for free on 101convert.com without installing software: choose the 3PG file, select OPUS as the output format, start the conversion, and download the resulting file. Upload only recordings that are appropriate for a third-party service.

Quality, compatibility, and limitations

Conversion from AMR or another lossy source to Opus cannot restore detail already discarded by the original encoding. For speech, a mono Opus output around 24–40 kbps is often sufficient; higher settings preserve more music detail but increase file size.

Some applications recognize 3GPP media only under the .3gp extension. Renaming .3pg to .3gp can help software identify the container, but it does not convert the audio and should be done only after confirming that the file is genuinely 3GPP media. Test the output in the intended player because older devices may not support Opus.