Skref 1: Hladdu upp 3GP skrárnar með því að nota hnappinn hér að ofan eða með því að draga og sleppa.
Skref 2: Smelltu á hnappinn „Breyta“ til að hefja umbreytinguna.
Skref 3: Sæktu umbreyttu skrána þína MP4 skrár
3GP til MP4 Algengar spurningar um viðskipti
How do I re-encode 3GP to MP4 without losing video quality?
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Upload your 3GP file and the converter runs a CRF-based re-encode targeting visually-lossless MP4 output (CRF 18 by default, lower values = larger file / higher quality). The codec is chosen to match the MP4 container — H.264 for broad-compat MP4, H.265 for size-efficient MKV, VP9 for WebM, AV1 for newer pipelines.
Which video codec does the MP4 output use?
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It depends on the MP4 container. MP4 defaults to H.264 for the broadest playback support across phones, browsers, and Smart TVs. MKV defaults to H.265 / HEVC for roughly half the file size at equivalent quality. WebM defaults to VP9. The advanced options expose explicit codec choice if you need to override.
Will my audio track survive 3GP to MP4 conversion?
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Yes. When 3GP and MP4 share an audio codec (e.g. both carry AAC), audio is re-muxed with no re-encode — bit-identical. When the codecs differ, audio is transcoded to AAC / Opus / Vorbis depending on what the MP4 container supports. Multi-track audio (commentary, alternate languages) is preserved.
Can I keep the original framerate when converting 3GP to MP4?
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By default yes — a 24fps 3GP stays 24fps in MP4; a 60fps 3GP stays 60fps. If you need to change rate (e.g. interlaced 29.97 → progressive 30, or 60 → 30 for upload limits), the framerate option handles 3:2 pulldown, deinterlacing, and frame-blending in the same encode pass.
How much will the file size change going from 3GP to MP4?
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Same-codec re-mux (3GP H.264 → MP4 H.264 just changing container): nearly identical size. Codec change can swing dramatically: H.264 → H.265 typically halves the file at the same visual quality; VP9 is roughly comparable; AV1 cuts another 20-30% but is slower to encode.
Will the MP4 file play on iPhone, Android, and Smart TVs?
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MP4 / H.264 plays natively on every modern device. MOV / H.264 plays on Apple devices and most TVs but not always on older Android. MKV needs VLC on iOS. WebM is browser-first. The advanced options include a "device compatibility" preset that picks the safest MP4 codec / container for your target.
How long does converting a 1-hour 3GP video to MP4 take?
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Same-codec re-mux is near-instant — 30 to 60 seconds for a 1-hour file. A full codec re-encode runs at roughly 0.3-0.7x source duration on our GPU pipeline, so a 1-hour 3GP → MP4 finishes in 18-40 minutes depending on resolution and target codec.
What is the maximum resolution supported for 3GP to MP4?
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Up to 8K (7680×4320) on Premium plans. Free conversions are capped at 4K (3840×2160) by the per-file size limit. HDR metadata (HDR10, HDR10+, Dolby Vision when present) is carried through where both 3GP and MP4 containers support it.
Is my 3GP video private during conversion to MP4?
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Yes. Uploaded video files are processed in isolated workers, never viewed by a human, never indexed, and deleted within minutes of completion. The retention window is documented at /privacy/ and we publish no training corpus from user uploads.
Can I crop, trim, or rotate during the 3GP to MP4 conversion?
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Not in the same step — use /video-trim/ or /video-cutter/ to clip first, then run the 3GP → MP4 conversion. Chaining trim and convert is faster than re-encoding the entire 3GP just to drop unused footage.
Why is the MP4 file blurry compared to the 3GP source?
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Almost always a bitrate-too-low setting. Re-encoding from a high-bitrate 3GP into a default-CRF MP4 compresses heavily on motion-rich scenes. Push CRF down to 16-18, or set an explicit target bitrate matched to the 3GP source, and the MP4 regains its clarity.
Does the 3GP to MP4 converter handle subtitles?
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Yes — embedded subtitle tracks (mov_text in MP4, SRT/ASS in MKV) are preserved when both 3GP and MP4 containers support them. Burned-in (hardsub) subtitles transfer automatically because they live in the video frame itself.