WebM to 3GP Converter

How to Convert WebM to 3GP Online

1. Upload Your WebM File: Drag and drop or click "Add Files" to select WebM clips — screen recordings, downloaded HTML5 video, exports from OBS or DaVinci Resolve, anything saved with VP8 / VP9 / AV1 video plus Opus or Vorbis audio. Batch is supported; drop a folder and queue them all.
2. Pick a Video Codec and Quality: Default is H.264 (baseline profile inside 3GP — the safest pick for 2010-era smartphones and most feature phones from ~2008 onward). Choose H.263 for the oldest Nokia / Sony Ericsson handsets that pre-date H.264 baseline, or MPEG-4 Part 2 (Simple Profile) for mid-range phones from the 2005-2009 window. Set a quality preset (Highest -> Lowest), target a percentage of the original size or an exact size in MB to fit MMS or memory-card limits, or fine-tune with CRF on the H.264 0-51 scale (18 = visually lossless, 23 = default, 28 = small).
3. Set Resolution and Audio (Optional): Pick a resolution preset (Original / 144p / 240p / 360p / 480p) — feature phones rarely render anything above QVGA (320x240) cleanly, so dropping to 240p often saves the most space without losing perceived quality. Default audio is AAC (the modern 3GPP audio codec, supported on every smartphone). Switch to AMR Narrow Band for voice-only clips on the oldest handsets, or AMR Wide Band for 2005+ phones that handle wideband speech. Use the trim section to cut start time and duration in HH:MM:SS.sss format if you only need a portion.
4. Convert and Download: Click Convert. Files process in your browser session — no sign-up, no watermark, no upload to a third-party server.

Why Convert WebM to 3GP?

WebM (Google's 2010 open-source format with VP9 / AV1 / VP8 video and Opus / Vorbis audio) is the de-facto open web video container, but it has near-zero playback support outside browsers and modern OSes. 3GP (3GPP Multimedia File, standardised in 2001 for UMTS / 3G phones) is the legacy mobile format every feature phone, dumbphone, and pre-2012 smartphone understands natively. Common reasons to convert WebM -> 3GP:

• Playback on feature phones and dumbphones — Nokia 105 / 110 / 225, Light Phone, KaiOS handsets (JioPhone, Cat S22), and any flip phone sold for emergency or low-distraction use. None of them speak WebM. 3GP with H.263 or baseline H.264 is the format their built-in player expects.
• MMS-friendly clips for legacy carriers — MMS payloads are typically capped at 300 KB to 1 MB depending on the carrier and the recipient's plan. 3GP at QCIF (176x144) or QVGA (320x240) with AMR-NB audio is the only format reliably small enough to deliver as a true MMS attachment instead of an RCS / iMessage fallback.
• In-car infotainment and old GPS units — A surprising number of 2008-2014 vehicle head units (Toyota Entune early gen, Ford Sync 1, basic Pioneer / Kenwood) and Garmin / TomTom devices accept 3GP from a USB stick or SD card but reject WebM outright.
• Low-storage offline viewing — A 60-minute lecture or sermon recorded in WebM at 720p might be 200-400 MB. Re-encoded to 3GP at 240p with AMR-WB audio, the same content fits in 30-60 MB — practical for cheap microSD cards on travel-only phones, e-readers, or kid-tablets with limited space.
• Embedded systems and kiosks — Industrial display controllers, ticket kiosks, and older digital signage players often ship with a stripped-down media stack that handles 3GP / MP4 but not WebM. Conversion is the cheapest way to deliver content without a hardware refresh.
• Archival to a phone-native format — Recordings shot on modern phones and exported to WebM can be normalised back to 3GP for consistency with a legacy library of phone footage from the 2003-2012 era, keeping a personal archive in one container.

If you want broad modern device support instead of legacy compatibility, convert WebM to MP4 — MP4 with H.264 plays on iOS, Android, smart TVs, and set-top boxes without sacrificing quality the way 3GP does.

WebM vs 3GP — Format Comparison

Codec Choice for the 3GP Output

Frequently Asked Questions

Will the converted 3GP look worse than my WebM source?

Probably yes, and that's the point. 3GP is a constrained container — even at H.264 baseline it's typically delivered at 64-512 kbps and 240p-360p so it actually runs on the target devices. Your 1080p VP9 WebM at 4 Mbps will be downscaled and re-encoded to fit. Pick the highest quality preset and 480p resolution if you want it as crisp as 3GP allows; pick 240p with the AMR-NB audio codec if you're optimising for the smallest possible file.

Should I pick H.263, MPEG-4, or H.264 baseline?

H.264 baseline for almost everything — practically every 3GP-capable handset sold from roughly 2008 onward decodes it, and it's the most efficient option so the file is smaller at the same visual quality. MPEG-4 Simple Profile for mid-2000s phones that lack H.264 hardware decode. H.263 only when targeting genuinely old handsets (pre-2008 Nokia / Sony Ericsson / Motorola) or trying to match a specific archival catalogue that's already in H.263.

Why is the 3GP output smaller than my WebM source?

WebM at default quality often runs at 1-4 Mbps for HD content, while 3GP is tuned for 64-512 kbps cellular delivery. The format itself drops resolution, bitrate, and audio quality to hit feature-phone constraints. If your output is dramatically smaller than expected, that's correct — it's the price of legacy compatibility. Use the file-size-percentage option if you want a specific target size in MB.

Will 3GP play on a modern iPhone or Android?

Yes — both iOS and Android handle 3GP via their default video player, since the container is essentially a stripped-down MP4. But there's no reason to use 3GP on a modern phone; for any 2013+ device you should convert WebM to MP4 instead and keep the full quality. 3GP only makes sense when targeting a feature phone, an old in-car unit, or a strict file-size cap like MMS.

Does AMR audio actually sound okay?

AMR Narrow Band is a voice codec — 8 kHz sample rate, 4.75-12.2 kbps. It's fine for spoken word, terrible for music. AMR Wide Band runs at 16 kHz and up to 23.85 kbps, much better for voice and tolerable for podcasts. For anything with music, stick with AAC at 64-128 kbps; the file is slightly larger but every 3GP-capable phone past ~2008 decodes AAC natively.

Can I trim a long WebM into a short 3GP?

Yes. Use the trim section to enter a start time and duration; both accept seconds (12.5) or HH:MM:SS.sss (00:00:30.500). Trimming first means the encoder does less work and the output is smaller — useful when you're trying to fit a clip under a 1 MB MMS cap or onto a low-capacity feature phone with a tiny memory card.

What resolution should I use for a feature phone?

Most pre-2012 feature phones max out at QVGA (320x240) or below. Pick 240p as a safe default. For the very oldest Nokia / Sony Ericsson handsets, drop to 144p (closest to QCIF 176x144). For 2010-2012 mid-range smartphones running Symbian / S40 / early Android, 360p plays cleanly. Going higher than 480p is rarely useful — the 3GP container and the device hardware aren't designed for it.

What's the file size limit?

XConvert handles large WebM sources without an arbitrary cap. Conversion happens in-browser, so the practical limit is your device's available memory. No watermark, no quantity limit on batch jobs, no sign-up — drop a folder of WebM exports and convert them all at once.

Why convert to 3GP instead of MP4?

3GP is a stricter subset designed for cellular networks and feature phones — smaller files, narrower codec support, and guaranteed playback on hardware that pre-dates 2012. MP4 is more universal on modern devices but isn't always recognised by basic phones, in-car units, or kiosk players that explicitly look for the 3GP fourCC. If your target is a modern phone or PC, convert WebM to MP4; if your target is a Nokia 105, a 2008 head unit, or an MMS attachment, 3GP is the correct pick.