Step 1: Supply your MP4 files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted 3GP files.
MP4 to 3GP Conversion FAQ
What does the MP4 to 3GP converter do?
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Converting modern MP4 into 3GP is useful for older editing software or legacy playback hardware. The converter remuxes or re-encodes as needed; expect a larger file because legacy codecs compress less efficiently.
Will resolution and frame rate be preserved in the 3GP?
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Yes. MP4 → 3GP keeps resolution, frame rate, and aspect ratio unchanged by default. To change them, use the Resize or Speed tool on the result.
Is the MP4 to 3GP conversion reversible?
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You can convert the 3GP back to MP4 on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
Will the converted 3GP be a different size than the MP4?
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Modern codecs compress better, so 3GP from a legacy MP4 is typically 30-60% smaller at equivalent quality. Conversions in the opposite direction can grow the file.
Can MP4 be converted to 3GP without re-encoding the video?
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Yes, and it is the fast path. MP4 and 3GP share the same underlying box structure, so the video and audio streams are copied across byte-for-byte and only the container wrapper is rewritten. Nothing is decoded and nothing is re-compressed, so a feature-length file finishes in under a minute instead of half an hour, with output quality identical to the source. MP4 is ISO/IEC 14496-14, standardised in 2001 and derived from the same QuickTime box layout MOV uses. 3GP is the container the 3GPP standardised for early mobile phones, when video had to fit a 176x144 screen and a 2G data plan.
What happens to the subtitle tracks in my MP4 file?
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They cannot stay selectable, because 3GP has no soft-subtitle stream to hold them. There are two ways out: burn them into the video during conversion, which makes them permanent and unstyleable, or export them as a separate .srt alongside the 3GP for the player to load. The converter tells you which it did rather than dropping them silently. 3GP is capped at low resolutions and mono speech-grade audio; upscaling it will not restore detail that was never captured.
Can I still embed the file on a web page after converting MP4 to 3GP?
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Not directly. MP4 plays inline in every browser; 3GP does not, so a page embedding it falls back to a download link or an empty player frame. If the file is destined for a website, keep the MP4 for the web and treat the 3GP as the archive or editing copy.
What happens to 5.1 surround audio when converting MP4 to 3GP?
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It is downmixed to stereo, because 3GP has no dependable multichannel path. The fold-down uses the standard ITU coefficients so dialogue in the centre channel stays intelligible and the surrounds come in at reduced level rather than vanishing. Anything that relied on discrete channel placement is gone after that.
Is there a file-size limit when converting MP4 to 3GP?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several MP4 files to 3GP at once?
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Yes. Drop or pick multiple MP4 files in one upload — the converter processes them in parallel and returns a ZIP of the 3GP results. There is no need to repeat the upload step per file.
What happens to my MP4 files after the conversion?
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Uploaded files and 3GP outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
Will my 3GP play on phones, tablets, and TVs?
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3GP plays in most desktop players but is sometimes unsupported on mobile and TV. For broadest reach, consider MP4 instead.
