Convert FLV to 3GP — Free Online Converter
Convert Flash Video (.flv) to 3GPP Multimedia (.3gp) online for free. Fast, secure video conversion with no watermarks or registration....
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Upload your .flv 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.
About FLV to 3GP Conversion
FLV (Flash Video) was the dominant streaming format used by YouTube, Twitch, and millions of Flash-based web players from 2005 to 2015. It typically contains Sorenson Spark (H.263) or VP6 video paired with MP3 audio. 3GP is a lightweight multimedia container designed by the 3rd Generation Partnership Project specifically for 3G mobile networks, using H.263 or MPEG-4 Part 2 video with AMR narrowband audio. Converting FLV to 3GP lets you play legacy Flash video content on older mobile phones and feature phones that only support 3GPP playback.
Why Convert FLV to 3GP?
After Adobe ended Flash support in December 2020, FLV files became unplayable in modern browsers. 3GP was built for bandwidth-constrained mobile networks and remains supported on virtually every mobile device manufactured since 2003. Converting to 3GP dramatically reduces file size — a 50 MB FLV file often compresses to under 5 MB in 3GP — making it ideal for sharing over slow connections or storing on devices with limited memory.
Common Use Cases
- Transferring old Flash video downloads to basic feature phones that only support 3GP playback
- Sharing legacy FLV recordings via MMS, which typically requires 3GP format and small file sizes
- Archiving FLV webcam recordings from early video chat platforms in a mobile-friendly format
- Preparing FLV tutorial clips for offline viewing on low-end Android phones with limited codec support
- Reducing FLV file sizes for upload to legacy mobile content portals that accept only 3GP
How It Works
The conversion re-encodes FLV's Sorenson Spark or VP6 video into H.263 or MPEG-4 Simple Profile, which are the codecs 3GP supports. Audio is transcoded from MP3 or Nellymoser to AMR-NB at 8 kHz. Resolution is typically scaled down to QCIF (176x144) or CIF (352x288) to match 3GP's mobile-oriented constraints. FFmpeg handles the remuxing and transcoding, applying the -s flag for resolution scaling and -ar for audio resampling.
Quality & Performance
Expect noticeable quality reduction. 3GP targets very low bitrates (64-384 kbps video, 4.75-12.2 kbps AMR audio) compared to FLV's typical 300-2000 kbps range. Fine detail and smooth motion will be lost, but the result is perfectly watchable on small mobile screens. For better quality, consider using H.264 Baseline Profile within the 3GP container if the target device supports it.
Device Compatibility
| Device | FLV | 3GP |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use CIF resolution (352x288) instead of the default QCIF (176x144) if your target phone supports it — you will get noticeably sharper video
- 2Set the video bitrate to at least 256 kbps if your device and network can handle it to preserve more detail from the FLV source
- 3If the FLV contains H.264 video (common in later Flash content), request H.264 Baseline Profile in 3GP for better quality-to-size ratio
- 4Extract the audio separately as an MP3 before converting if you need a high-quality backup of the sound track
- 5Batch convert entire folders of archived FLV downloads in one operation to save time when migrating a video library to mobile format
Related Conversions
FLV to 3GP conversion bridges the gap between obsolete Flash web video and mobile playback. While quality is traded for extreme portability and small file sizes, it remains the most practical way to get legacy Flash content onto basic phones and MMS systems.