Extract Audio from 3GP to FLAC — Free Online Tool
Extract audio from 3GP mobile video files and save it as lossless FLAC, decoding the AAC or MP3 audio track and re-encoding it into FLAC's open lossless format. Ideal for archiving audio from 3G-era mobile recordings without any further quality degradation.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your 3GP file here
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Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
3GP files typically carry AAC or MP3 audio alongside H.264 video, optimized for the constrained bandwidth and storage of 3G mobile devices. This tool discards the video stream entirely and decodes the compressed audio track — usually AAC at a low bitrate like 64k — then re-encodes it into FLAC, a lossless format. Because the source audio in 3GP is lossy (AAC or MP3), the FLAC output is a lossless capture of that decoded audio signal; it won't recover quality lost during the original 3GP encoding, but it ensures no additional quality is lost in any future processing or conversion. The output file will be noticeably larger than the 3GP source due to FLAC's uncompressed-style storage, but compression level 5 strikes a good balance between encode speed and file size.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary, the open-source multimedia processing engine that powers this conversion both in the browser (via FFmpeg.wasm) and on the desktop command line. |
-i input.3gp
|
Specifies the input 3GP file. FFmpeg reads the container and identifies the available streams — typically an H.264 video track and an AAC or MP3 audio track optimized for 3G mobile playback. |
-vn
|
Disables video output entirely, telling FFmpeg to ignore the H.264 video stream inside the 3GP file. Since FLAC is a pure audio format, this flag is required to prevent FFmpeg from attempting an incompatible video transcode. |
-c:a flac
|
Selects the FLAC encoder for the audio output stream. FFmpeg will decode the source AAC or MP3 audio from the 3GP container to raw PCM, then re-encode it using the open-source lossless FLAC codec. |
-compression_level 5
|
Sets FLAC's compression effort to level 5 on a scale of 0–8. This is FLAC's recommended default — it reduces file size meaningfully compared to level 0 without the slow encoding of level 8, and it has zero effect on audio quality since all FLAC levels are bit-for-bit identical on decode. |
output.flac
|
Specifies the output filename with the .flac extension. FFmpeg uses this extension to confirm the FLAC container format and writes the losslessly encoded audio extracted from the 3GP source to this file. |
Common Use Cases
- Archiving audio from old 3GP video clips recorded on early Nokia, Sony Ericsson, or other 3G-era mobile phones into a durable, lossless format
- Extracting speech or interview audio from a 3GP recording to use as a clean source for transcription or audio restoration tools that work best with lossless input
- Preserving the audio track of a 3GP home video before the file degrades further, ensuring no additional lossy re-encoding occurs during long-term storage
- Pulling music or ambient sound recorded in 3GP format into a digital audio workstation (DAW) that accepts FLAC for sample editing or remixing
- Converting a batch of 3GP voicememos or field recordings from a mobile device into FLAC for integration into a lossless music library managed by software like foobar2000 or Roon
- Stripping the video from a 3GP clip to produce a FLAC file for use as a ringtone source or notification sound on a device that supports FLAC playback
Frequently Asked Questions
No — FLAC is lossless, meaning it preserves exactly what it receives, but it cannot restore quality that was already discarded during the original AAC or MP3 encoding inside the 3GP file. If the 3GP was recorded at 64 kbps AAC (a common mobile default), the FLAC will be a perfect lossless copy of that 64 kbps signal. The advantage is that all future edits or conversions start from this fixed point without adding further lossy artifacts.
3GP files are aggressively compressed for mobile storage and low-bandwidth streaming, often keeping both video and audio in a very small footprint. FLAC stores the decoded audio waveform with lossless compression, which is inherently much larger than a low-bitrate AAC stream. A 5 MB 3GP file might produce a FLAC of 30–80 MB depending on the audio duration, sample rate, and content. This size increase is expected and reflects the shift from lossy mobile-optimized encoding to lossless archival storage.
3GP most commonly contains AAC audio, though MP3 is also permitted by the standard. Both are lossy codecs. During this conversion, FFmpeg decodes whichever lossy codec is present and then re-encodes the raw PCM audio into FLAC. The output quality ceiling is therefore set by whichever codec was used in the original 3GP — AAC at 64 kbps will yield a different fidelity ceiling than AAC at 128 kbps, but in both cases FLAC preserves that decoded signal with zero further loss.
The compression level is controlled by the -compression_level flag, which accepts values from 0 to 8. The default used here is 5, which balances encoding speed and file size well. Using -compression_level 8 produces the smallest possible FLAC file but takes significantly longer to encode, while -compression_level 0 encodes fastest but yields the largest file. Crucially, all compression levels produce bit-identical audio output — only the file size and encode time differ, never the audio quality.
The single-file command shown here can be adapted for batch processing in a shell script. On Linux or macOS, you can run: for f in *.3gp; do ffmpeg -i "$f" -vn -c:a flac -compression_level 5 "${f%.3gp}.flac"; done. On Windows Command Prompt, use a for loop: for %f in (*.3gp) do ffmpeg -i "%f" -vn -c:a flac -compression_level 5 "%~nf.flac". This is especially useful for processing large archives of old mobile recordings that exceed the 1 GB browser limit.
FFmpeg will attempt to copy any metadata tags present in the 3GP container — such as title, artist, or date — into the FLAC file's Vorbis comment tag block, which is FLAC's native metadata format. However, 3GP files from older mobile devices often carry minimal or no user-facing metadata, so the FLAC output may have few tags. You can inspect or edit the tags afterward using tools like Kid3, MusicBrainz Picard, or metaflac.
Technical Notes
3GP was designed by 3GPP for transmission over constrained 3G networks, and its audio streams reflect those constraints — AAC-LC at 64 kbps is a typical ceiling, and some very old recordings use even lower bitrates or narrower frequency responses (e.g., 8 kHz sample rate for voice). When extracting to FLAC, FFmpeg decodes the compressed audio to PCM and then encodes it with the flac codec at compression_level 5. The output FLAC will carry the same sample rate and channel count as the source, so a mono 8 kHz voice recording will become a mono 8 kHz FLAC — FLAC does not upsample or upmix. The -vn flag is essential here since FFmpeg would otherwise attempt to transcode the H.264 video stream, which FLAC cannot carry. One known limitation: some 3GP files from proprietary mobile implementations contain non-standard AMR-NB or AMR-WB audio tracks; FFmpeg supports AMR decoding, so extraction will still succeed, but AMR audio has a narrow telephone-quality range (typically 3.4 kHz bandwidth) that will be faithfully but unflatteringly preserved in the FLAC output.