3G2 to M4A Converter

Extract 3G2 Audio to M4A: What This Tutorial Covers

This walk-through is for anyone holding an old .3g2 clip from a CDMA-era phone who wants the soundtrack as a plain .m4a that plays on a modern phone or laptop. By the end you will have pulled the audio out of the video and wrapped it in AAC inside an M4A container — and you will know, honestly, what that audio will and won't sound like.

How to Convert 3G2 to M4A

1. Upload Your 3G2 File: Drag and drop, or click "Add Files", to select .3g2 (or .3gp) videos. Batch is supported, so a folder of old phone clips runs in one job. The video track is read only to locate the audio — the picture is not kept in an M4A output.
2. Pick a Quality Preset: Leave the Quality Preset on Very High (Recommended) for a faithful AAC copy, or drop it to Medium/Low to shrink the file. M4A re-encodes the audio, so a higher preset preserves more of whatever was in the source — it cannot add detail the source never held.
3. Set Audio Channel and Audio Sample Rate (Optional): Both default to ORIGINAL. Mono is the honest choice for a single-mic phone recording, and keeping the original sample rate avoids upsampling that adds bytes without adding sound. You can also pick a Custom Bitrate or Constant Bitrate here if you want a specific size.
4. Convert and Download: Use the Trim panel first if you only want one moment, then click Convert and download the M4A. No sign-up, no watermark.

Walk-through: Choosing Settings That Match What's Actually in the File

The audio inside a .3g2 is one of a few codecs, and the right settings depend on which one. A .3g2 from a CDMA2000 handset usually carries narrowband speech (QCELP, EVRC, or AMR-NB); a newer one may carry AAC. M4A always outputs AAC, so the conversion is either an upgrade in compatibility (speech codec → AAC) or an AAC-to-AAC re-encode.

• If the source is QCELP, EVRC, or AMR-NB speech: these are telephone-quality voice codecs sampled at 8 kHz. Keep Audio Sample Rate on ORIGINAL and Audio Channel on Mono. A low preset is fine — the audio is band-limited, so a high bitrate just wastes space on a stream that never carried more than phone-call detail.
• If the source is AAC: you are doing an AAC-to-AAC re-encode (one extra generation of lossy loss). Keep the Quality Preset high, or set a Custom Bitrate at or above what the source used, to minimize that generation loss.
• If you don't know the source codec: leave everything on ORIGINAL at Very High. That setting is safe for both cases and is what produces the most faithful M4A the source allows.

Common Errors and How to Fix Them

• "The M4A sounds tinny / muffled, like a phone call" — That is the source, not the conversion. A .3g2 from a CDMA phone usually holds 8 kHz narrowband speech (EVRC/QCELP/AMR-NB), and AAC cannot reconstruct frequencies that were never recorded. The output is a faithful, compatible copy of a low-fidelity original.
• "I wanted the video, but I only got audio" — M4A is an audio-only format, so the picture is always discarded. To keep the picture, use 3G2 to MP4, which re-wraps the video and audio together.
• "The M4A won't play on an old media player" — Some legacy players don't read the .m4a extension even though the audio is standard AAC. Rename a copy to .aac, or use 3G2 to MP3 for the most universally playable file.
• "My file is named .3gp, not .3g2" — The same pipeline accepts both, since .3g2 and .3gp share the MPEG-4 Part 12 base structure. You can also use the 3GP to M4A page directly.

When This Doesn't Work

A handful of .3g2 files won't convert cleanly. Clips that were truncated when a phone's storage filled up, or files copied off a failing memory card, can be missing the index a decoder needs to find the audio. DRM-locked purchases (rare on this format, but possible on old carrier "ringback" or media-store downloads) also can't be re-encoded. If a clip fails, try 3G2 to MP3 as an alternative path, or keep the whole file intact with 3G2 to MP4. For an archival master that never degrades again rather than a compatible everyday file, 3G2 to FLAC stores the decoded audio losslessly.

Frequently Asked Questions

Does this keep the video, or only the audio?

Only the audio. .3g2 is a video container, but M4A is an audio-only format, so the picture is discarded and you get just the soundtrack as an AAC file. The video track is read only to locate the audio. To keep the picture instead, use 3G2 to MP4, which re-wraps the video and audio together.

Will converting an EVRC or QCELP clip to M4A make it sound better?

No. EVRC (developed by Qualcomm in 1995 to replace the earlier QCELP vocoder) and QCELP are CDMA-network speech codecs that operate in narrowband mode, sampling at 8 kHz over roughly a 0–4 kHz range — about the bandwidth of a phone call. M4A re-encodes that audio as AAC for broad compatibility, but it cannot add back frequencies the speech codec never captured. The honest result plays everywhere modern but sounds like the tinny original. The value here is compatibility, not fidelity.

What does the M4A actually gain me over the original 3G2?

Playability. .3g2 is a legacy CDMA2000 container that many current players and apps no longer open, while M4A's AAC payload plays natively on iPhones, Android phones, iTunes, QuickTime, and modern browsers. So the gain is reach — getting old phone audio onto devices people actually use today — rather than any improvement in how the audio sounds.

Why does my 3G2 hold such low-quality audio in the first place?

Because .3g2 is the 3GPP2 container (introduced in January 2004) built for CDMA2000 phones on extremely low-bandwidth 3G networks, so its default audio codecs were narrowband speech vocoders like QCELP, EVRC, and AMR-NB. Those were tuned to keep a voice call intelligible at a few kilobits per second, not to capture music or full-range sound. The format is the carrier-network twin of GSM-era .3gp.

Is M4A better than MP3 for this conversion?

At the same bitrate, AAC inside M4A is generally a bit more efficient than MP3, so M4A is a good default for Apple devices and modern players. But MP3 is the more universally playable format, especially on old hardware. If maximum compatibility matters more than codec efficiency, use 3G2 to MP3 instead.

My .3g2 files are from an old Verizon or Sprint phone — will they work?

Yes, that is the main use case. .3g2 was the container used by CDMA2000 phones, which in the US meant carriers like Verizon and Sprint. Since Verizon shut down its 3G CDMA network on December 31, 2022, clips saved off those old handsets are exactly the kind of footage worth pulling into a playable format before the files are forgotten. The same pipeline also accepts .3gp from GSM-era phones.

How are my files handled after conversion?

Files are uploaded over an encrypted connection and processed on our servers — no sign-up and no watermark. They are deleted automatically a few hours after conversion and are never shared or made public.