FLV to 3GP Converter

How to Convert FLV to 3GP Online

1. Upload Your FLV Files: Click "+ Add Files" or drag and drop one or more FLV (Flash Video) files into the browser. Batch is supported — every file uses the same settings.
2. Choose File Compression: Pick Quality Preset (Very High to Very Low — Very High is the default), Specific file size in MB, Constant Bitrate, Variable Bitrate, Constant Quality (CRF-style), or Constraint Quality. Open Video Codec to lock the output to H.263, MPEG-4 Part 2, or H.264 depending on which 3GP profile your target phone needs; switch Audio Codec between AAC-LC and AMR-NB / AMR-WB for the smallest mobile-friendly files.
3. Video Resolution and Trim (Optional): Use Preset Resolutions (176×144, 352×288, 640×360, 1280×720…), Width × Height for custom sizes, or Resolution Percentage to scale by ratio. Open Trim to keep only a Time Range instead of converting the whole clip — useful when an old FLV is much longer than the snippet a 3GP-only phone actually needs.
4. Convert and Download: Click Convert. Files are processed in your browser session — no sign-up, no watermark, no email required. Download the .3gp file when status reaches Done.

Why Convert FLV to 3GP?

FLV (Flash Video) was the de facto streaming container of the early web — YouTube, Hulu, VEVO and Yahoo! Video all used it before HTML5 video took over. Adobe ended Flash Player support on December 31, 2020, and browser vendors blocked Flash content shortly after, so most FLV files now sit unplayed in old hard drives, e-learning archives, and backup folders. 3GP is a different kind of legacy format: it was published by the 3rd Generation Partnership Project (3GPP) in April 2003 for UMTS / 3G phones, and it remains the only container many feature phones, low-end Android handsets, and dashcams will actually read.

Converting FLV to 3GP keeps an old library playable on hardware that never got an MP4 / H.264 update path:

• Feature phones still on H.263 — basic GSM/3G handsets (older Nokia Series 40, Sony Ericsson, Samsung E-series) reliably play 3GP with H.263 video + AMR audio. Converting an FLV/Sorenson Spark or VP6 clip into that profile is often the only way to get it onto the phone at all.
• Low-end dashcams, voice recorders, and digital photo frames — many sub-$30 devices ship firmware that only decodes 3GP. Drop the converted file straight onto the SD card.
• MMS-size archive copies — 3GP at 176×144 with AMR-NB audio produces tiny files (often well under 1 MB per minute) that fit in MMS or low-bandwidth uploads where MP4/H.264 won't.
• E-learning and corporate training migrations off Flash — institutions still digitising Flash-era LMS content sometimes need both an MP4 master and a 3GP fallback for legacy regional devices. For the modern copy, use FLV to MP4; use this page for the mobile fallback.
• Re-encoding Flash recordings of webcams and screencasts — old Camtasia, Adobe Connect, and Articulate exports were often FLV with Nellymoser or MP3 audio. 3GP forces AAC-LC or AMR, which most modern media players also handle.

If your target device actually supports MP4 (anything from 2010 onward, including iPhone, Android 2.x+, smart TVs, and modern Windows/macOS), prefer FLV to MP4 — you'll keep more of the source quality. Use this page when 3GP is genuinely required.

FLV vs 3GP vs MP4 — Container Comparison

3GP Codec / Bitrate Quick Guide

Frequently Asked Questions

Why pick 3GP over MP4 if both can hold H.264?

Some devices reject MP4 even when the inner codec is identical — they read the container header, not the codec. Older Nokia, BlackBerry, and budget Android handsets check for the 3gp4 or 3gp5 brand in the file's ftyp box and won't open a file labelled as MP4 (isom/mp42) even if it would otherwise decode. If a phone's manual lists 3GP playback only, force the 3GP container; on anything from roughly 2010 onward, MP4 is the better choice.

Will my FLV quality survive the conversion?

It depends on what 3GP profile you pick. Going to H.263 at 176×144 will visibly degrade anything sharper than a webcam recording — H.263 was never designed for HD. Going to H.264 Baseline at 640×360 with VBR around 600 kbps keeps most FLV/VP6 sources looking acceptable. Use the Quality Preset dropdown set to High or Very High if the target device supports H.264 in 3GP; drop to Medium only when you need maximum compatibility with very old hardware.

My FLV has Nellymoser or Speex audio. What happens to it?

Those Flash-era voice codecs aren't valid inside 3GP. The converter will re-encode the audio track to AAC-LC (best quality) or AMR-NB / AMR-WB (smallest size, mono speech only). For old webcam recordings, screencasts, and Adobe Connect exports, AMR-WB at 12.65 kbps usually preserves intelligibility while shrinking the file significantly.

What's the difference between 3GP and 3G2?

3GP (.3gp) was defined for GSM-based UMTS networks and is the worldwide standard. 3G2 (.3g2) is the CDMA2000 variant published by 3GPP2, historically used by Verizon, Sprint, and KDDI handsets. The two share most codecs, but 3G2 adds EVRC and SMV audio. If you're not sure which your device wants, 3GP is the safer default — try 3GP to 3G2 only if a Verizon-era handset refuses the .3gp.

Why is the converted 3GP so much smaller than the FLV?

3GP profiles cap resolution, bitrate, and audio channels much more aggressively than FLV ever did. A 1080p FLV at 2 Mbps re-encoded to QCIF H.263 + AMR-NB will routinely shrink to under 5% of the original. If the output is much smaller than expected and looks blocky, raise the Quality Preset, switch the codec to H.264, and bump the resolution preset.

Can I trim the FLV before converting?

Yes — open the Trim option and set a Time Range (start/end timestamps). The converter encodes only that range, which is the fastest way to fit a long FLV recording inside a tight target file size. Trimming happens before re-encoding so it doesn't add a generation-loss pass.

Do I need Flash Player installed to convert FLV files?

No. The converter decodes FLV with bundled video codec libraries — Flash Player has been unsupported since December 2020 and you should not install it. Upload the .flv file directly and it will be re-muxed and re-encoded into 3GP entirely in-browser.

What's the maximum file size I can convert?

Free conversions work for files up to the in-browser session memory limit (typically several hundred MB to ~1 GB depending on device). For very large FLV archives, split the source first with a video cutter, or convert chunks separately. If you only need the audio track, convert FLV to MP3 first to confirm the source is intact, then re-do the video pass.

Should I compress the 3GP after converting?

Usually not — 3GP profiles already enforce low bitrates. If the file is still too large for MMS or an old SD card, run it through Compress 3GP instead of re-converting, so you don't stack two lossy re-encodes back to back. Going the other direction? Use 3GP to MP4 for a modern-device copy.