Convert Free Lossless Audio Codec (.flac) to 3GPP Multimedia (.3gp) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .flac file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .3gp file when it's ready.
FLAC files preserve studio-quality audio at roughly half the raw file size, but 3GP was designed for an entirely different world — early 3G mobile networks where every kilobyte counted. Converting FLAC to 3GP compresses lossless audio into AMR-NB at 12.2 kbps or AAC-LC at low bitrates, producing files small enough for legacy feature phones and MMS messaging. The resulting audio is heavily compressed, but the format remains relevant for compatibility with older handsets that lack modern codec support.
The primary reason to convert FLAC to 3GP is to create audio clips that play on legacy mobile devices from the early 2000s and 2010s, many of which only support 3GP containers. This is also useful for generating ringtones or notification sounds for older Symbian, BREW, or early Android phones. Some telephony systems and IVR platforms still accept 3GP as an input format for hold music or pre-recorded messages.
The conversion decodes FLAC's lossless bitstream through its reference decoder, then encodes the PCM output into AMR-NB (narrowband, 8 kHz sample rate, up to 12.2 kbps) or AAC-LC inside a 3GP container. FFmpeg handles both the FLAC decoding and 3GP muxing. Because 3GP's audio codecs operate at extremely low bitrates, frequency content above 3.4 kHz (AMR-NB) or roughly 16 kHz (AAC-LC at low bitrates) is discarded. The 3GP container itself is a subset of ISO Base Media File Format (ISO 14496-12), closely related to MP4.
Expect substantial quality loss. FLAC preserves the full original signal, while 3GP audio at typical settings sounds similar to a phone call. AMR-NB is limited to 300-3400 Hz bandwidth. If the 3GP target uses AAC at 64 kbps or above, quality improves noticeably, but it still represents a major step down from lossless. For spoken content the degradation is acceptable; for music it is clearly audible.
| Device | FLAC | 3GP |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Native |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
FLAC to 3GP conversion is a niche but practical operation for anyone working with legacy mobile infrastructure. Use the highest bitrate your target device supports, and test playback on the actual hardware before distributing files.
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| No |
| Funktion | FLAC | 3GP |
|---|---|---|
| Fullstandigt namn | Free Lossless Audio Codec | 3GPP Multimedia |
| Filandelse | .flac | .3gp |
| Bast for | Lossless compression | Mobile optimized |