3GPP to FLAC Converter

3GPP to FLAC Converter

This tool pulls the audio track out of a .3gpp mobile video and saves it as FLAC, a lossless format. .3gpp is the same MPEG-4 container as .3gp — two spellings of one format, both used by GSM-era phones — so if your file ends in .3gp, use the 3GP to FLAC page instead, which also accepts CDMA .3g2. The conversion exists for archiving: FLAC freezes whatever audio the phone recorded into a copy that never degrades again.

3GPP Format at a Glance

FLAC Format at a Glance

What's Actually Inside Your 3GPP File

The audio sitting in a 3GPP container is almost always one of two codecs, and they behave very differently when converted to FLAC:

• AMR-NB (most pre-2010 phone recordings). AMR-NB is the narrowband speech codec 3GPP adopted in October 1999. It captures only 200–3,400 Hz at an 8 kHz sample rate — the same bandwidth as a landline phone call — at 4.75–12.2 kbit/s. FLAC preserves that audio exactly, but it cannot add back highs the phone never recorded. The honest result: your FLAC is larger than the 3GPP yet sounds identical to the tinny, telephone-quality source. You are archiving what exists, not upgrading it.
• AAC (some newer phones). This is the ordinary lossy-to-lossless case. FLAC freezes the AAC audio losslessly at the moment of conversion. It won't recover anything AAC discarded during its original encode, but it stops further generation loss and gives you a clean master.

If your goal is faithful preservation, FLAC is the right pick despite the size. If you want a small file to share, FLAC is the wrong tool — use 3GPP to MP3 instead. To keep the picture rather than just the soundtrack, use 3GPP to MP4.

How to Convert 3GPP to FLAC

1. Upload Your 3GPP File: Drag and drop or click "Add Files" to select .3gpp videos. Batch is supported, so a folder of old phone clips can run in one job.
2. Set the Compression level: Use the Compression level slider (1–12). FLAC is lossless at every setting, so this only trades encoding speed against file size — lower is faster but larger, higher is slower but smaller. The decoded audio is identical regardless.
3. Set Audio Channel and Audio Sample Rate (Optional): Both default to ORIGINAL, which preserves the source. You can force Mono (sensible for a single-mic phone recording) or resample, though keeping ORIGINAL avoids upsampling that adds bytes without adding detail.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.

Frequently Asked Questions

Is .3gpp the same format as .3gp?

Yes. .3gpp and .3gp are two filename extensions for the identical MPEG-4 Part 12 container that 3GPP defined for GSM and UMTS phones — same structure, same codecs, same content. This page accepts .3gpp; if your file is named .3gp (or you have a CDMA .3g2), use 3GP to FLAC, which handles those spellings. The .3g2 extension is a genuinely different format (3GPP2, for CDMA2000 phones), not just a different spelling.

Will converting an old AMR-NB recording to FLAC improve the sound quality?

No. FLAC is lossless, so it preserves the source exactly — but exactly is the ceiling. AMR-NB only captured 200–3,400 Hz at 8 kHz, the bandwidth of a phone call, so the FLAC will faithfully reproduce that narrowband audio and nothing more. The file will be larger, but it will sound the same as the original. FLAC's value here is permanence — freezing the recording before the original degrades — not added fidelity.

Why is my FLAC file so much bigger than the original 3GPP?

Because the 3GPP held lossy, heavily compressed audio (often AMR-NB at 4.75–12.2 kbit/s) and FLAC is lossless. Lossless encoding of the decoded stream typically lands far above a low-bitrate speech codec, so a tiny voice memo can become a noticeably larger FLAC. That growth is normal and is the trade-off for an exact, never-degrading copy.

Does the FLAC keep the video, or only the audio?

Only the audio. 3GPP is a video container, but FLAC is an audio-only format, so the picture is discarded and you get just the soundtrack as a lossless file. The video track is read only to locate the audio. If you want to keep the picture, use 3GPP to MP4, which re-wraps the video and audio together.

Should I extract to FLAC or to MP3 for an old phone clip?

It depends on the goal. FLAC is lossless and ideal for an archival master you never want to degrade, but the file is larger and the sound is capped by what AMR-NB originally captured. MP3 is lossy and far smaller, which is better if you just want to share or store the clip casually — 3GPP to MP3 handles that. For preservation, choose FLAC; for a small shareable file, choose MP3.

How big does the FLAC come out in practice?

In our testing, a one-minute AMR-NB voice memo (originally a few hundred kilobytes in 3GPP) produced a FLAC of a few megabytes, because lossless encoding of the decoded 8 kHz stream needs far more space than the original speech codec used. An AAC-sourced 3GPP lands closer to a typical lossless size for its sample rate. Exact figures depend on the source codec, clip length, and how busy the audio is.

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.